SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549


                                  SCHEDULE 13D
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
     TO RULE 13d-1(a) AND AMENDMENTS THERETO FIELD PURSUANT TO RULE 13d-2(a)

                               (Amendment No. 1)1

                            NEON Communications, Inc.
-------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, $.01 par value per share
-------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                  640 506 10 1
-------------------------------------------------------------------------------
                                 (CUSIP Number)

         Paul Baskowsky, Esq., Dilworth Paxson LLP, 1735 Market Street,
              3200 Mellon Bank Center, Phila. Pa 19103 215-575-7012
-------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                 August 10, 2001
-------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of This Statement)

                  If the filing person has previously filed a statement on
           Schedule 13G to report the acquisition that is the subject of this
           Schedule 13D, and is filing this schedule because of Rule 13-d1(e),
           13d-1(f) or 13d-1(g), check the following box [ ].
                  Note. Schedules filed in paper format shall include a signed
           original and five copies of the schedule, including all exhibits. See
           Rule 13d-7 for other parties to whom copies are to be sent.
                         (Continued on following pages)


--------------------------
         1 The remainder of this cover page shall be filled out for a reporting
   person's initial filing on this form with respect to the subject class of
   securities, and for any subsequent amendment containing information which
   would alter disclosures provided in a prior cover page.

         The information required on the remainder of this cover page shall not
   be deemed to be "filed" for the purpose of Section 18 of the Securities
   Exchange Act of 1934 or otherwise subject to the liabilities of that section
   of the Act but shall be subject to all other provisions of the Act (however,
   see the Notes).




[CUSIP Number 640 506 10 1]

Schedule 13D                    Forms


-------------|-----------------------------------------------------------------
1            |NAMES OF REPORTING PERSONS
             |I.R.S. IDENTIFICATIN NO. OF ABOVE PERSONS (ENTITIES ONLY)
             |Exelon Capital Partners, Inc.               EIN: 0394261
-------------|-----------------------------------------------------------------
2            |CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*   (a) [ x ]
             |                                                    (b) [   ]
-------------|-----------------------------------------------------------------
3            |SEC USE ONLY
-------------|-----------------------------------------------------------------
4            |SOURCE OF FUNDS*
             |WC, AF
-------------|-----------------------------------------------------------------
5            |CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT
             | TO ITEM 2(d) or 2(e)                                     [  ]
-------------|-----------------------------------------------------------------
6            |CITIZENSHIP OR PLACE OF ORGANIZATION
             |Pennsylvania
-------------|-----------------------------------------------------------------
NUMBER OF SHARES             |7            SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH   |              0
REPORTING PERSON WITH        |
-----------------------------|------------ ------------------------------------
                             |8            SHARED VOTING POWER
                             |              13,820,316
-----------------------------|------------ ------------------------------------
                             |9            SOLE DISPOSITIVE POWER
                             |              4,535,793
-----------------------------|------------ ------------------------------------
                             |10           SHARED DISPOSITIVE POWER
                             |             None
-----------------------------|------------ ------------------------------------
11           | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             |  13,820,316 (1)
-------------|-----------------------------------------------------------------
12           | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             | CERTAIN SHARES*
-------------|-----------------------------------------------------------------
13           | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
             | 52.3 %
-------------|-----------------------------------------------------------------
14           | TYPE OF REPORTING PERSON*
             |  CO
-------------|-----------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

--------------------

(1)  Includes 9,284,523 shares beneficially held by others who together with
     Exelon Capital Partners, Inc., may be deemed to constitute a group with
     regard to a total of 13,820,316 shares. Also includes 2,300,000 shares
     issuable upon conversion of the entire principle of a convertible note
     described below and 104,650 shares issuable upon conversion of interest for
     sixty days from the date of this filing. This Amendment No. 1 is filed by
     Exelon Capital Partners, Inc. and Exelon Corporation to report an increase
     in beneficial ownership of the common stock of NEON Communication, Inc. as
     a result of a purchase of a subordinated convertible note by Exelon
     Enterprises Management, Inc. Exelon Enterprises Management, Inc., formerly
     known as Exelon Ventures Corp., was a reporting person in a Schedule 13D
     dated September 25, 2000. Subsequent to the purchase of the subordinated
     convertible note, Exelon Enterprises Management, Inc. transferred its
     interest in the note and all other securities of NEON Communication, Inc.
     owned by it to ECP Telecommunications Holding, Inc. which is directly owned
     by Exelon Capital Partners, Inc. This Amendment is also being filed to
     report a change in a stockholders agreement that deletes the right of first
     offer with respect to any transfers of shares of common stock of NEON
     Communication, Inc. to each of the other stockholders who are party to the
     agreement.





                                       2


[CUSIP Number 640 506 10 1]


Schedule 13D                  Forms



-------------|------------------------------------------------------------------
1            |NAMES OF REPORTING PERSONS
             |I.R.S. IDENTIFICATIN NO. OF ABOVE PERSONS (ENTITIES ONLY)
             |Exelon Corporation      EIN: 23-2990190
-------------|------------------------------------------------------------------
2            |CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*   (a) [ x ]
             |                                                    (b) [   ]
-------------|------------------------------------------------------------------
3            |SEC USE ONLY
             |
-------------|------------------------------------------------------------------
4            |SOURCE OF FUNDS*
             |None
-------------|------------------------------------------------------------------
5            |CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT
             | TO ITEM 2(d) or 2(e)                    [  ]
-------------|------------------------------------------------------------------
6            |CITIZENSHIP OR PLACE OF ORGANIZATION
             |Pennsylvania
-------------|------------------------------------------------------------------
NUMBER OF SHARES             |7            SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH   |              None  (Item 5)
REPORTING PERSON WITH        |
-----------------------------|------------ -------------------------------------
                             |8            SHARED VOTING POWER
                             |               None
-----------------------------|------------ -------------------------------------
                             |9            SOLE DISPOSITIVE POWER
                             |              None (Item 5)
-----------------------------|------------ -------------------------------------
                             |10           SHARED DISPOSITIVE POWER
                             |              None
-----------------------------|------------ -------------------------------------
11            |AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
              |13,820,3161
--------------|-----------------------------------------------------------------
12            |CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
              |CERTAIN SHARES*
              |
--------------|-----------------------------------------------------------------
13            |PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
              |52.3 %
--------------|-----------------------------------------------------------------
14            |TYPE OF REPORTING PERSON*
              | CO, HC
--------------|-----------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


--------------------

(1) Includes 9,284,523 shares beneficially held by others who may
     be held to constitute a group of which subsidiary is a member with regard
     to a total of 13,820,316 shares.



                                       3


Item 1.  Security and Issuer.
(a) Class:
     Common Stock, par value $.01 per share (b) Name of Isssuer:
      NEON Communications, Inc
(c) Address of Issuer's Principal Executive Office:
     2200 West Park Drive, Westborough, Massachusetts 01851


Item 2.  Identity and Background.
Exelon Corporation, a Pennsylvania corporation, indirectly owns all of the
         issued and outstanding stock of Exelon Capital Partners, Inc.
(a) Name of Filing Person:
     Exelon Corporation
(b) Residence or Business Address:
      10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
      Provider of power generation and other services.


Directors of Exelon Corporation:
(a) Name:
     Corbin A. McNeill, Jr.
(b) Residence or Business Address:
      10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
     Chairman and Co-Chief Executive Officer of Exelon Corporation


(a) Name:
     John W. Rowe
(b) Residence or Business Address:
       10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
     President and Co-Chief Executive Officer of Exelon Corporation



                                       4


(a) Name:
      Daniel L. Cooper
(b) Residence or Business Address:
       10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
     Former Vice-President and General Manager, Nuclear Services Division
     Gilbert/Commonwealth, Inc.

(a) Name:
      M. Walter D'Alessio
(b) Residence or Business Address:
       10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
     President and Chief Executive Officer Legg Mason Real Estate Services.

(a) Name:
     G. Fred DiBona, Jr.
(b) Residence or Business Address:
       10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
      President and Chief Executive Officer, Independence Blue Cross.

(a) Name:
     Bruce DeMars
(b) Residence or Business Address:
      10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
     Chief Executive Officer, Nonproliferation Trust

(a) Name:
      Richard H. Glanton, Esq.
(b) Residence or Business Address:
       10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
     Partner of the law firm Reed Smith Shaw & McClay, LLP.



                                       5



(a) Name:
     Rosemarie B. Greco
(b) Residence or Business Address:
      10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
     Principal, GRECO Ventures.

(a) Name:
     John M. Palms, Ph.D.
(b) Residence or Business Address:
       10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
      President of the University of South Carolina.

(a) Name:
     Sue L. Gin
(b) Residence or Business Address:
      10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
      Founder, Owner, Chairman and Chief Executive Officer of Flying
      Foods Group, Inc.

(a) Name:
     Ronald Rubin
(b) Residence or Business Address:
       10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
     Chief Executive Officer, The  Pennsylvania Real Estate Investment Trust.

(a) Name:
     Edgar D. Jannotta
(b) Residence or Business Address:
      10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
      Chairman, William Blair & Company, L.L.C.




                                       6


(a) Name:
     Edward A. Brennan
(b) Residence or Business Address:
      10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
      Retired Chairman and Chief Executive Officer, Sears, Roebuck and Co.

(a) Name:
     Carlos H. Cantu
(b) Residence or Business Address:
      10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
      Retired President and Chief Executive Officer, The ServiceMaster Company

(a) Name:
     John W. Rogers, Jr.
(b) Residence or Business Address:
      10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
      Founder, Chairman and Chief Executive Officer, Ariel
      Capital Management, Inc.

(a) Name:
     Richard L. Thomas
(b) Residence or Business Address:
      10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
      Retired Chairman, First Chicago NBD Corporation


Officers of Exelon Corporation:
(a) Name:
     Corbin A. McNeill, Jr.
(b) Residence or Business Address:
     10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
     Chairman and Co-Chief Executive Officer.



                                       7



(a) Name:
     John W. Rowe
(b) Residence or Business Address:
     10 S. Dearborn St., 37th Fl., Chicago, IL  60690
(c) Present Principal Occupation:
     President and Co-Chief Executive Officer

(d) , (e) Neither Exelon Corporation nor, to the best knowledge of Exelon
Corporation, any director or officer of Exelon Corporation, has been convicted
in a criminal proceeding (excluding traffic violations or similar misdemeanors),
or been a party to a civil proceeding of a judicial or administrative body of
competent jurisdiction as a result of which he or she is subject to a judgment,
decree or final order enjoining future violations of or prohibiting or mandating
activities subject to, federal or state securities laws or finding any
violations with respect to such laws.

(f) Citizenship:
Exelon Corporation is organized under the laws of the Commonwealth of
Pennsylvania. All of Exelon Corporation's directors and officers are citizens of
the United States of America.


(a) Name of Person Filing:
     Exelon Capital Partners, Inc., a Delaware corporation, is an indirectly
     wholly owned  subsidiary of Exelon Corporation.
(b) Residence or Business Address:
      2751 Centerville Road, Suite 3170, Wilmington, DE  19808
(c) Present Principal Occupation:
      Owns and manages capital investments.

Directors of Exelon Capital Partners, Inc.:
(a) Name:
     Robert A. Shinn
(b) Residence or Business Address:
      2751 Centerville Road, Suite 3170, Wilmington, DE  19808
(c) Present Principal Occupation:
     President, Exelon Capital Partners, Inc.



                                       8



(a) Name:
      Glenn Newman
(b) Residence or Business Address:
     10 S. Dearborn Street, 37th Floor, Chicago, IL  60690
(c) Present Principal Occupation:
      Vice President Human Resources, Exelon Energy Development Company LLC
      Chief Labor Counsel, Exelon Business Services, Co.
(a) Name:
      Gregory A. Cucchi
(b) Residence or Business Address:
     401 City Line Avenue, Bala Cynwyd, PA  19004
(c) Present Principal Occupation:
      President, Exelon Enterprises Co., LLC

Officers of Exelon Capital Partners, Inc.:
(a) Name:
     Robert A. Shinn
(b) Residence or Business Address:
      2751 Centerville Road, Suite 3170, Wilmington, DE  19808
(c) Present Principal Occupation:
     President
(d), (e) Neither Exelon Capital Partners, Inc. nor, to the best knowledge of
Exelon Capital Partners, Inc., has any director or officer of Exelon Capital
Partners, Inc., been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors), or been a party to a civil proceeding of a
judicial or administrative body of competent jurisdiction as a result of which
he or she is subject to a judgment, decree or final order enjoining future
violations of or prohibiting or mandating activities subject to, federal or
state securities laws or finding any violations with respect to such laws.

(f) Citizenship:
Exelon Capital Partners, Inc. is organized under the laws of the State of
Delaware. All of Exelon Capital Partners, Inc.'s directors and officers are
citizens of the United States of America.

Item 3.  Source and Amount of Funds or Other Consideration.
Pursuant to the terms of a Subordinated Convertible Note Purchase Agreement
between NEON Communications, Inc. ("NEON") and Exelon Enterprises Management,
Inc. dated as of August 10, 2001 (the "Convertible Note Purchase Agreement")
more fully described in Item 4 below, NEON issued its $11,500,000 principal
amount, 18% Subordinated Convertible Note due 2008, (the "Note") in
consideration of payment of $11,500,000. The source of the funds was working
capital of Exelon Corporation, an affiliated entity of Exelon Enterprises,
Management, Inc. On August 11, 2001 Exelon Enterprises Management, Inc.
transferred all of its interest in the Note and all other securities of NEON
held by it to ECP Telecommunications Holdings, LLC ("ECP"). ECP is wholly-owned
by Exelon Capital Partners, Inc. Exelon Capital Partners, Inc. is wholly-owned
by Exelon Enterprises Management, Inc., however the beneficial owners of the
securities of NEON are deemed to be Exelon Capital Partners, Inc. and Exelon
Corporation.




                                       9


Item 4.  Purpose of Transaction.
On August 10, 2001, NEON and Exelon Enterprises Management, Inc. completed the
transaction whereby NEON issued the Note which provides, in part, that Exelon
Enterprises Management, Inc. may at its option convert all or any portion (in
increments of $1,000,000) of the principal amount of the Note together with all
accrued and unpaid interest thereon, at any time and from time to time up to and
including the maturity date into shares of NEON's common stock at an initial
conversation price of $5.00 per share. The conversion price is subject to
adjustment in certain circumstances. At the option of NEON, subject to certain
conditions, NEON may deliver a notice requiring that the Note automatically be
converted into the common stock of NEON. The Note also provides that NEON may
not issue shares of its common stock upon conversion that would equal or exceed
19.99% of the total issued and outstanding common stock unless it obtains
shareholder approval or is granted an exemption from the NASDAQ Stock Market.

Although neither Exelon Corporation nor Exelon Capital Partners, Inc. (the
"Reporting Persons") have any current intention to do so, the Reporting Persons
may, from time to time, purchase additional shares of NEON common stock on the
open market, in negotiated transactions, pursuant to the rights described in
Item 6, below, or otherwise. The Reporting Persons intend to sell all or a part
of the shares of NEON they own. Such sales may be made in the open market or
otherwise.

Except as described herein, the Reporting Persons have no plans or proposals of
the type described in paragraphs (a) through (j) of Item 4 of this Schedule 13D.

Item 5.  Interest in Securities of the Issuer.
(a) and (b). The following table sets forth the aggregate number of shares and
percentages of the outstanding shares of Common Stock of NEON beneficially owned
by each of the Reporting Persons and by each executive officer, director and
controlling person, if any, of the Reporting Persons, and, to the knowledge of
the Reporting Persons, each other party who may be deemed, together with Exelon
Capital Partners, Inc., to constitute a group. Any of such persons whose names
do not appear in the table below do not beneficially own any shares of common
stock of NEON. Except as otherwise noted, each person listed has sole voting and
dispositive power over all shares listed opposite its name.

                            Number of shares                  Percentage of
Name of Person             beneficially owned              outstanding shares
--------------             ------------------              ------------------

Exelon Corporation         13,820,316(a)                      52.3%

Exelon Capital
   Partners, Inc.          13,820,316(a)                      52.3%

Consolidated Edison
   Communications, Inc.    13,820,316(a)                      52.3%
    ("CEC")

Mode 1
   Communications, Inc.    13,820,316(a) (b)                  52.3%
    ("Mode 1")

 (a) Shared voting power as to all shares for the limited purpose described in
the Schedule 13D dated September 25, 2000, and sole dispositive power over
4,535,793 shares, as to Exelon Capital Partners, Inc., 2,476,735 shares, as to
CEC, and 6,807,788 shares, as to Mode 1.

(b) Excludes any additional shares of common stock of NEON which Mode 1 may be
deemed to own.


                                       10


Exelon Corporation indirectly owns all of the issued and outstanding shares of
Exelon Capital Partners, Inc., and is, therefore, the indirect beneficial owner
of all of the shares of NEON beneficiary owned by Exelon Capital Partners, Inc.
Pursuant to Section 13(d)(3) under the Securities Exchange Act, Exelon Capital
Partners, Inc., CEC and Mode 1 may each be deemed to beneficially own the shares
of common stock of NEON owned by the others as a result of the limited agreement
as to voting described in the Initial Schedule 13D.

No person named in response to Item 2 has effected any transaction in the common
stock reported on during the past 60 days.

Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to
        Securities of the Issuer.

Subordinated Convertible Note Purchase Agreement

As noted in Item 3, Exelon Capital Partners, Inc. and NEON are parties to a
Subordinated Convertible Note Purchase Agreement pursuant to which the Reporting
Persons have the right to acquire certain shares of common stock of NEON.

Registration Rights Agreement

Under the terms of a Registration Rights Agreement (the "Registration
Agreement") dated as of August 10, 2001, NEON agreed as soon as practicable
after the closing of the transaction, but no longer than forty-five days after
closing, to use its best efforts to effect the registration of the shares of
common stock issuable upon conversion of the principal amount of the Note plus
the number of shares which represent interest payments that would become due on
the Note through August 15, 2004 and to register 2,131,143 shares of the common
stock of NEON already beneficially owned by the Reporting Persons. NEON also
agreed to file an additional registration statement no later than January 15,
2005 to the extent necessary to register additional shares of common stock which
represent interest payments that would become due under the Note through its
maturity date. In connection with any such registration, the parties have agreed
to mutually indemnify each other against certain liabilities, including
liabilities under the federal securities laws.

Stockholders Agreement

Mode 1, Exelon Enterprises Management, Inc., CEC (each referred to herein as a
"Stockholder" and in the aggregate as "Stockholders") and NEON are parties to a
Stockholders' Agreement dated as of September 14, 2000 (the "September
Stockholders' Agreement") under which the Stockholders agreed to vote all of the
shares of common stock of NEON owned by them or over which any of them have
voting control, so as to fix the number of directors of NEON at nine, to elect
two directors designated by Mode 1, initially John H. Forsgren and Gary D.
Simon, one director designated by Exelon, initially Robert A. Shinn, and one
member designated by CEC, initially Peter A. Rust. Each of the Stockholders also
agreed not to vote to remove any director designated by any of the other
Stockholders, except for bad faith or willful misconduct. Mode 1's right to
designate two directors shall be reduced to one in the event its stock ownership
is reduced below certain specified levels.

On August 10, 2001, the Stockholders amended the September Stockholders'
Agreement to delete a provision under which each Stockholder had granted the
other Stockholders on a pro rata basis certain rights of first offer with
respect to any transfers of shares of common stock of NEON owned by it.

On August 30, 2001, Exelon Capital Partners, Inc. designated Gregory A. Cucchi
to serve as its designee on the NEON board of directors in place of Robert A.
Shinn.


                                       11


Item 7.  Material to be Filed as Exhibits.

Exhibit A: Subordinated Convertible Note Purchase Agreement dated as of
           August 10, 2001.
Exhibit B: 18% Subordinated Convertible Note due 2008.
Exhibit C: Registration Rights Agreement dated as of August 10, 2001.
Exhibit D: Stockholders Agreement dated September 14, 2000.*
Exhibit E: Amendment No. 1 to Stockholders Agreement dated August 10, 2001.

*Previously filed






                                       12




                                    SIGNATURE


After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

                                Date: October 23, 2001

                                EXELON CORPORATION



                                By:          /s/ Scott N. Peters
                                             ------------------------

                                Name:        Scott N. Peters
                                             ------------------------

                                Title:       Assistant Secretary
                                             ------------------------



                                EXELON CAPITAL PARTNERS, INC.



                                By:          /s/ Robert A. Shinn
                                             ------------------------

                                Name:        Robert A. Shinn
                                             ------------------------

                                Title:       President
                                             ------------------------



         The original statement shall be signed by each person on whose behalf
the statement is filed or his authorized representative. If the statement is
signed on behalf of a person by his authorized representative (other than an
executive officer or general partner of the filing person), evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name of any title of each person who signs the statement shall be typed or
printed beneath his signature.

         Attention: Intentional misstatements or omissions of fact constitute
federal criminal violations (see 18 U.S.C. 1001).




                                       13




                             JOINT FILING STATEMENT


In accordance with Rule 13d-1(f) promulgated pursuant to the Securities Exchange
Act of 1934, the undersigned hereby agree to the joint filing on behalf of each
of them of a Statement on Schedule 13D, including amendments thereto, with
respect to the Common Stock, par value $.01 per share, of NEON Communications,
Inc. and that this Joint Filing Statement be included as an Exhibit to such
joint filing.

Date: October 23, 2001

EXELON CORPORATION


By:           /s/ Scott N. Peters
              ----------------------------------------

Name:         Scott N. Peters
              ----------------------------------------

Title:        Assistant Secretary
              ----------------------------------------


EXELON CAPITAL PARTNERS, INC.


By:           /s/ Robert A. Shinn
              ----------------------------------------

Name:         Robert A. Shinn
              ----------------------------------------

Title:        President
              ----------------------------------------


ECP TELECOMMUNICATIONS HOLDINGS, LLP


By:           /s/ Robert A. Shinn
              ----------------------------------------

Name:         Robert A. Shinn
              ----------------------------------------

Title:        Manager
              ----------------------------------------





                                       14

                                                                       EXHIBIT A

                            NEON COMMUNICATIONS, Inc.

                SUBORDINATED CONVERTIBLE NOTE PURCHASE AGREEMENT


     This SUBORDINATED CONVERTIBLE nOTE Purchase Agreement (the "Agreement") is
entered into as of August 10, 2001, between NEON COMMUNICATIONS, INC., a
Delaware corporation (the "Company"), and EXELON ENTERPRISES MANAGEMENT, INC., a
Pennsylvania corporation (the "Purchaser").

                                    RECITALS

     WHEREAS, the Company has authorized the sale and issuance of up to a
maximum of $11,500,000 in aggregate principal amount of an 18 % Subordinated
Convertible Note due 2008 (the "Note"), which Note is convertible into shares
(the "Conversion Shares") of the Company's common stock, par value $.01 per
share (the "Common Stock") in accordance with the terms of the Note;

     WHEREAS, Purchaser desires to purchase the Note on the terms and conditions
set forth herein and subject to the terms and conditions of the Note; and

     WHEREAS, the Company desires to issue and sell the Note to Purchaser on the
terms and conditions set forth herein and as set forth in the Note.

     NOW, THEREFORE, in consideration of the foregoing recitals and the mutual
covenants and agreements set forth herein and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties hereto agree as follows:

     1. DEFINITIONS. As used in this Agreement, the following terms have the
following meanings:

          1.1 "Affiliate" of any specified Person means any other Person,
directly or indirectly, controlling or controlled by or under direct or indirect
common control with such specified Person. For the purposes of this definition
"control" when used with respect to any Person means the power to direct the
management and policies of such Person, directly or indirectly, whether through
the ownership of voting securities, by contract or otherwise and the terms
"controlling" and "controlled" have meanings correlative to the foregoing.

          1.2 "Agreement" shall have the meaning set forth in the Preamble.

          1.3 "Amended and Restated Registration Rights Agreement" means that
certain Amended and Restated Registration Rights Agreement dated as of August
10, 2001 by and among the Company, Purchaser and CEC, amending and restating the
Registration Rights Agreement dated as of September 14, 2000 by and among the
Company, Purchaser and CEC, substantially in the form attached hereto as Exhibit
B.

          1.4 "Amendment No. 1 to Stockholders Agreement" means that certain
Amendment No. 1 to Stockholders Agreement dated as of August 10, 2001 by and
among Mode 1, CEC, Purchaser and the Company, amending the Stockholders
Agreement dated as of September 14, 2000 by and among Mode 1, CEC, Purchaser and
Company, substantially in the form attached hereto as Exhibit C.

          1.5 "Amendment No. 3 to Subscription Agreement" means that certain
Amendment No. 3 to Subscription Agreement dated as of August 10, 2001 by and
among Purchaser, the Company and Northeast Optic Network, Inc. ("Northeast



Optic"), amending the Subscription Agreement dated as of November 23, 1999 by
and among Purchaser, the Company and Northeast Optic, as amended on May 1, 2000
and September 6, 2000, respectively, substantially in the form attached hereto
as Exhibit D.

          1.6 "By-laws" means the by-laws of the Company as in effect on the
Closing Date.

          1.7 "CEC" means Consolidated Edison Communications, Inc., a New York
corporation.

          1.8 "Certificate of Incorporation" means the amended and restated
certificate of incorporation of the Company as in effect on the Closing Date.

          1.9 "Closing" shall have the meaning set forth in Section 2.3.

          1.10 "Closing Date" shall have the meaning set forth in Section 2.3.

          1.11 "Common Stock" shall have the meaning set forth in the Recitals.

          1.12 "Exchange Act" means the Securities Exchange Act of 1934, as
amended, and the rules and regulations of the SEC thereunder.

          1.13 "GAAP" means generally accepted accounting principles as in
effect from time to time in the United States of America, applied on a
consistent basis both as to classification of items and amounts.

          1.14 "Governmental Authority" means any court, administrative or
regulatory agency or commission or other governmental entity or instrumentality,
domestic, foreign or supranational or any department thereof.

          1.15 "Indebtedness" with respect to any Person means, without
duplication: (i) all indebtedness (including principal, interest, fees and
charges) of such Person for borrowed money or for the deferred purchase price of
property or services other than trade payables included in current liabilities
in accordance with GAAP and incurred in respect of Property or services
purchased in the ordinary course of business and which obligation is payable on
terms no longer than 180 days past the invoice date, (ii) the maximum amount
available to be drawn under all letters of credit issued for the account of such
Person and all unpaid drawings in respect of such letters of credit, and (iii)
all Indebtedness of the types described in clause (i) or (ii) of this definition
secured by any lien on any property owned by such Person, whether or not such
Indebtedness has been assumed by such Person.

          1.16 "Indenture" means the Indenture dated as of August 5, 1998,
between the Company and U.S. Bank Trust National Association.

          1.17 "Material Adverse Effect" means any materially adverse effect
upon the business operation, assets, liabilities, financial condition, results
of operations or business prospects of the Company or any of its Subsidiaries,
or upon the ability of the Company to operate its current business or to perform
the Transaction Documents, resulting from any act, omission, situation, status,
event or undertaking, either singly or taken together.

          1.18 "Mode 1" means Mode 1 Communications, Inc., a Connecticut
corporation.

                                       2


          1.19 "Nasdaq" means the National Association of Securities Dealers,
Inc. Automated Quotation System.

          1.20 "NEON Opinion of Counsel" shall mean the opinion of Paul,
Hastings, Janofsky & Walker LLP, counsel to NEON, dated as of the Closing Date,
substantially in the form set forth in Exhibit G.

          1.21 "NEON SEC Documents" means the Company's Annual Report on Form
10-K for the fiscal year ended December 31, 2000 as amended by the form 10-K/A
filed on April 30, 2001; the Company's Quarterly Report on Form 10-Q for the
fiscal quarter ended March 31, 2001; and the Company's Proxy Statement filed on
July 5, 2001.

          1.22 "Note" shall have the meaning set forth in the Recitals.

          1.23 "Person" means any individual, partnership, limited liability
company, joint venture, corporation, trust, unincorporated organization, any
other entity or Governmental Authority.

          1.24 "Proprietary Information" shall mean any and all confidential
information or technical or business information furnished, in whatever form or
medium, or disclosed by the Company to Purchaser including, but not limited to,
Capital Expenditure proposals, annual Budget and Capital Expenditure plans,
marketing plans and other financial or business data.

          1.25 "Purchase Price" shall have the meaning set forth in Section 2.2.

          1.26 "Purchaser" shall have the meaning set forth in the Preamble and
shall include any assignee of Purchaser which is an Affiliate of Purchaser or
any assignee permitted under Section 7.5 hereof.

          1.27 "Registration Rights Agreement" means the Registration Rights
Agreement between Purchaser and the Company dated August 10, 2001 substantially
in the form attached hereto as Exhibit E.

          1.28 "SEC" means the Securities and Exchange Commission.

          1.29 "Securities Act" means the Securities Act of 1933, as amended,
and the rules and regulations of the SEC thereunder.

          1.30 "Subsidiary" shall mean (i) any corporation of which fifty
percent (50%) or more of the voting stock, or any partnership of which fifty
percent (50%) or more of the outstanding partnership interests, is at any time
owned by the Company, or by one or more Subsidiaries of the Company, or by the
Company and one or more Subsidiaries of the Company, and (ii) any other entity
which is controlled or capable of being controlled by the Company or by one or
more Subsidiaries of the Company or by the Company and one or more Subsidiaries
of the Company.

          1.31 "Termination Agreement" means that certain Termination Agreement
between the Company, NEON Optica, Inc., PECO Energy Company and Purchaser dated
as of August 10, 2001, which terminates the System Agreement between the
Company, NEON Optica, Inc., PECO Energy Company and Purchaser dated as of
September 14, 2000, substantially in the form attached hereto as Exhibit F.

                                       3



          1.32 "Transaction Documents" means this Agreement, the Note, Amended
and Restated Registration Rights Agreement, Amendment No. 1 to Stockholders
Agreement, Amendment No. 3 to Subscription Agreement, Termination Agreement and
the Registration Rights Agreement.

     2. AGREEMENT TO SELL AND PURCHASE; CLOSING.

          2.1 Authorization of Note. On or prior to the Closing Date, the
Company shall have authorized the (i) sale and issuance to Purchaser of the
Note, and (ii) issuance of the Conversion Shares. The Note shall be
substantially in the form attached hereto as Exhibit A. As used in this
Agreement, "Note" shall include the Note issued pursuant to this Agreement,
together with any Note issued in exchange therefor or replacement thereof and
any Note which may be issued in payment of interest in accordance with the terms
thereof.

          2.2 Purchase and Sale of Note. Subject to the terms and conditions
hereof, in reliance upon the representations of Purchaser set forth in Section
4, at the Closing, the Company hereby agrees to execute, sell and deliver to
Purchaser and, in reliance upon the representations of the Company set forth in
Section 3, Purchaser agrees to purchase from the Company, a Note in the
aggregate principal amount of $11,500,000 (the "Purchase Price"), against
receipt of funds by wire transfer to an account or accounts designated by the
Company prior to the Closing as payment in full of the Purchase Price of the
Note.

          2.3 Closing. The closing of the purchase and sale of the Note under
this Agreement (the "Closing") shall take place on August 10, 2001, at the
offices of Paul, Hastings, Janofsky & Walker LLP, at 399 Park Avenue, New York,
NY 10022 or at such other time or place as the Company and Purchaser may
mutually agree upon (which time and place are designated as the "Closing Date").

     3. REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

          Except as set forth on a Schedule of Exceptions delivered by the
Company to Purchaser at the Closing (as attached as Schedule 1 hereto), the
Company hereby represents and warrants to Purchaser as of the date of the
Closing Date as follows:

          3.1 Organization and Qualification. The Company is a corporation duly
incorporated, validly existing and in good standing under the laws of the State
of Delaware and has all requisite corporate power and authority to own, lease
and operate its properties and to carry on its business as is now being
conducted. The Company is duly qualified or licensed and in good standing to do
business in each jurisdiction where the conduct of its business or the
ownership, leasing or operation of its respective properties require such
qualification or licensing, except where the failure to be so qualified or
licensed and in good standing, individually or in the aggregate, would not
reasonably be expected to have a Material Adverse Effect.

          3.2 Authority. The Company has all necessary corporate power and
authority to execute and deliver the Transaction Documents and to consummate the
transactions contemplated by the Transaction Documents. The execution and
delivery by the Company of the Transaction Documents and the consummation by the
Company of the transactions contemplated by the Transaction Documents have been
duly and validly authorized by the Board of Directors of the Company or by a
committee thereof to whom such authority has been delegated and no other
corporate proceedings on the part of the Company are necessary to authorize the
Transaction Documents or the consummation of the transactions contemplated by
the Transaction Documents. The Transaction Documents have been duly and validly
executed and delivered by the Company and, assuming the Transaction Documents
constitute valid and binding agreements of each other party hereto and thereto,
constitute valid and binding agreements of the Company, enforceable against the

                                       4



Company in accordance with their respective terms, except (i) as limited by
applicable bankruptcy, insolvency, reorganization, moratorium or other laws of
general application affecting enforcement of creditors' rights and (ii) general
principles of equity that restrict the availability of equitable remedies.

          3.3 Consents and Approvals; No Violation.

               (a) No material declaration, filing or registration with, or
notice to, or authorization, consent or approval of any Governmental Authority
or any consent from a third party, including any bank, alliance partner, lender,
investor or other Person, is necessary for the consummation by the Company of
the transactions contemplated by the Transaction Documents other than those
filings or consents which have already been made or received.

               (b) Neither the execution and delivery of the Transaction
Documents by the Company nor the sale by the Company of the Note or the issuance
of the Conversion Shares upon conversion of the Note pursuant to the terms of
this Agreement and the Note will (i) conflict with or result in any breach of
any provision of the Certificate of Incorporation or By-laws of the Company,
(ii) result in a default (or give rise to any right of termination, cancellation
or acceleration) or constitute an event which, with or without the giving of
notice, lapse of time, or both, would constitute a default under any of the
terms, conditions or provisions of any note, bond, mortgage, indenture, license,
agreement, lease or other instrument or obligation to which the Company is a
party or by which the Company or any of its respective properties is or may be
bound or (iii) except for the filing with Nasdaq of the Listing Application for
Additional Shares, violate any order, writ, injunction, decree, statute, rule or
regulation applicable to the Company or any of its respective properties, except
in the case of (ii) and (iii), any such conflict, event of default or violation
which would not be reasonably likely to have a Material Adverse Effect.

               (c) Neither the issuance of the Note, any payment of interest or
principal on the Note, nor any conversion of all or a portion of the Note into
Conversion Shares nor any setoff of the obligations of the Company due under the
Note against any liability owed by Purchaser to the Company under the
Termination Agreement will result in a default under the Indenture.

               (d) Neither the issuance of the Note nor the conversion of the
Note into Conversion Shares will trigger any anti-dilution provision contained
in any existing securities or contracts or any other instrument of the Company.

          3.4 NEON SEC Documents.

               (a) The capitalization of the Company, as well as its annual
balance sheets, statements of income and statements of cash flows, are disclosed
in all material respects in the NEON SEC Documents. The filed NEON SEC
Documents, at the time filed with the SEC, conformed in all material respects to
the then applicable requirements of the Exchange Act. The NEON SEC Documents do
not contain any untrue statements of a material fact or omit to state a material
fact required to be stated therein necessary in order to make the statements
therein not misleading in light of the circumstances in which they were made.

               (b) There has been no change to the business, assets or finances
of the Company since December 31, 2000, which has not been disclosed in the NEON
SEC Documents which would be reasonably expected to have a Material Adverse
Effect.

                                       5


          3.5 Legal Proceedings. Except as set forth on Schedule 1 hereto, there
are no claims, actions, proceedings or investigations pending or, to the
knowledge of the Company, threatened against or relating to the Company which
would, individually or in the aggregate, be reasonably expected to have a
Material Adverse Effect.

          3.6 Conversion Shares. Upon conversion of the Note, the Conversion
Shares, when issued and delivered to Purchaser in accordance with the terms of
the Note, will be duly and validly issued, fully paid and nonassessable, and
free and clear of any preemptive rights, liens and encumbrances.

          3.7 Offering Valid. Assuming the accuracy of the representations and
warranties of Purchaser contained in Section 4 hereof, the offer, sale and
issuance of the Note and the Conversion Shares will be exempt from the
registration requirements of the Securities Act and will have been registered or
qualified (or are exempt from registration and qualification) under the
registration, permit or qualification requirements of all applicable state
securities laws. Neither the Company nor any agent on its behalf has solicited
or will solicit any offers to sell or has offered to sell or will offer to sell
all or any part of the Note to any person or persons so as to bring the sale of
such Note by the Company within the registration provisions of the Securities
Act or any state securities laws.

     4. REPRESENTATIONS AND WARRANTIES OF PURCHASER.

          Purchaser hereby represents and warrants to the Company as follows
(such representations and warranties do not lessen or obviate the
representations and warranties of the Company set forth in this Agreement):

          4.1 Requisite Power and Authority. Purchaser has all necessary power
and authority under all applicable provisions of law to execute and deliver the
Transaction Documents and to consummate the transactions contemplated by the
Transaction Documents. All actions on Purchaser's part required for the lawful
execution and delivery of the Transaction Documents have been or will be
effectively taken prior to the Closing. No consent or approval is needed from
the SEC under the Public Utility Holding Company Act of 1935 in order for
Purchaser to purchase and hold the Note or the Conversion Shares. Upon their
execution and delivery, the Transaction Documents will be valid and binding
obligations of Purchaser, enforceable against Purchaser in accordance with their
terms, except (a) as limited by applicable bankruptcy, insolvency,
reorganization, moratorium or other laws of general application affecting
enforcement of creditors' rights and (b) general principles of equity that
restrict the availability of equitable remedies.

          4.2 Investment Representations. Purchaser understands that neither the
Note nor the Conversion Shares have been registered under the Securities Act.
Purchaser also understands that the Note and the Conversion Shares are being
offered and sold pursuant to an exemption from registration contained in the
Securities Act based in part upon Purchaser's representations contained in the
Agreement. Purchaser hereby represents and warrants as follows:

               (a) Purchaser Bears Economic Risk. Purchaser has substantial
experience in evaluating and investing in private placement transactions of
securities in companies similar to the Company so that it is capable of
evaluating the merits and risks of its investment in the Company and has the
capacity to protect its own interests. Purchaser must bear the economic risk of
this investment indefinitely unless the Note (or the Conversion Shares) is
registered pursuant to the Securities Act, or an exemption from registration is
available. Purchaser understands that, except for complying with its obligations
under the Registration Rights Agreement, the Company has no present intention of
registering the Note or the Conversion Shares. Purchaser also understands that
there is no assurance that any exemption from registration under the Securities
Act will be available and that, even if available, such exemption may not allow

                                       6



Purchaser to transfer all or any portion of the Note or the Conversion Shares
under the circumstances, in the amounts or at the times Purchaser might propose.

               (b) Acquisition Solely for Investment. Purchaser is acquiring the
Note and the Conversion Shares for Purchaser's own account for investment only,
and not with a view to, or for sale in connection with, any distribution of such
shares in violation of the Securities Act or any rule or regulation under the
Securities Act.

               (c) Purchaser Can Protect Its Interest. Purchaser represents that
by reason of its, or of its management's, business or financial experience,
Purchaser has the capacity to protect its own interests in connection with the
transactions contemplated by the Transaction Documents. Purchaser is aware of no
publication of any advertisement in connection with the transactions
contemplated by the Transaction Documents.

               (d) Accredited Investor. Purchaser represents that it is an
accredited investor within the meaning of Regulation D under the Securities Act.

               (e) Company Information. Purchaser has received and read the
financial statements of the Company in the NEON SEC Documents and has had an
opportunity to discuss the Company's business, management and financial affairs
with directors, officers and management of the Company and has had access to,
and the opportunity to review, the Company's operations and facilities.
Purchaser has also had the opportunity to ask questions of and receive answers
from, the Company and its management regarding the terms and conditions of this
investment.

               (f) Rule 144. Purchaser acknowledges and agrees that the Note,
and, if issued, the Conversion Shares must be held indefinitely unless they are
subsequently registered under the Securities Act or an exemption from such
registration is available. Purchaser has been advised or is aware of the
provisions of Rule 144 promulgated under the Securities Act as in effect from
time to time, which permits limited resale of shares purchased in a private
placement subject to the satisfaction of certain conditions, including, among
other things, the availability of certain current public information about the
Company, the resale occurring following the required holding period under Rule
144 and the number of shares being sold during any three-month period not
exceeding specified limitations.

               (g) Residence. The office or offices of Purchaser in which its
investment decision was made is located at the address or addresses of Purchaser
set forth in Section 7.9 hereof.

     5. CONDITIONS TO CLOSING.

          5.1 Conditions to Purchaser's Obligations at the Closing. Purchaser's
obligations to purchase the Note at the Closing are subject to the satisfaction,
at or prior to the Closing Date, of the following conditions:

               (a) Representations and Warranties True; Performance of
Obligations. The representations and warranties made by the Company in Section 3
hereof shall be true and correct in all material respects as of the Closing Date
with the same force and effect as if they had been made as of the Closing Date,
and the Company shall have performed all obligations and conditions herein
required to be performed or observed by it on or prior to the Closing.

               (b) Officer's Certificate. The Company shall have delivered to
Purchaser a Certificate, executed by the President of the Company, dated the
Closing Date, to the effect that the conditions specified in subsection (a) of
this Section 5.1 have been satisfied.

                                       7


               (c) Registration Rights Agreement. Each of Purchaser and the
Company shall have executed and delivered the Registration Rights Agreement.

               (d) Note. The Note shall have been executed and delivered by the
Company to Purchaser.

               (e) Waiver. The Company shall have obtained from CEC a waiver of
its right of first refusal under Section 5.05 of the Subscription Agreement
between the Company and CEC dated as of November 23, 1999, and as amended on May
1, 2000 and September 6, 2000.

               (f) Amended and Restated Registration Rights Agreement. Each of
CEC, the Company and Purchaser shall have executed and delivered the Amended and
Restated Registration Rights Agreement.

               (g) Amendment No. 1 to Stockholders' Agreement. Each of Mode 1,
CEC, Purchaser and the Company shall have executed and delivered Amendment No. 1
to Stockholders' Agreement.

               (h) Amendment No. 3 to Subscription Agreement. Each of Northeast
Optic Network, Inc., the Company and Purchaser shall have executed and delivered
Amendment No. 3 to Subscription Agreement.

               (i) Termination Agreement. Each of Purchaser, the Company, PECO
Energy Company and NEON Optica, Inc. shall have executed and delivered the
Termination Agreement.

               (j) NEON Opinion of Counsel. Purchaser shall have received the
NEON Opinion of Counsel.

               (k) Stockholder Approval. If required by law, Nasdaq rules or
otherwise, the Company shall have obtained approval of the issuance of the Notes
and the Conversion Shares by the Company's stockholders holding a majority of
the outstanding shares of Common Stock entitled to vote in person or by proxy.

          5.2 Conditions to Obligations of the Company. The Company's obligation
to issue and sell the Note at Closing is subject to the satisfaction, on or
prior to Closing, of the following conditions:

               (a) Representations and Warranties True. The representations and
warranties made by Purchaser in Section 4 hereof shall be true and correct in
all material respects at the Closing Date.

               (b) Performance of Obligations. Purchaser shall have performed
and complied with all agreements and conditions herein required to be performed
or complied with by Purchaser on or before the Closing.

               (c) Purchase Price. Purchaser shall have delivered to the Company
an amount equal to the Purchase Price.

               (d) Registration Rights Agreement. Each of Purchaser and the
Company shall have executed and delivered the Registration Rights Agreement.

                                       8


               (e) Amended and Restated Registration Rights Agreement. Each of
Purchaser, the Company and CEC shall have executed and delivered the Amended and
Restated Registration Rights Agreement.

               (f) Termination Agreement. Each of Purchaser, the Company, PECO
Energy Company and NEON Optica, Inc. shall have executed and delivered the
Termination Agreement.

               (g) Fairness Opinion. The Company shall have received an opinion
from a nationally recognized investment banking firm that the transactions
contemplated by the Transaction Documents are fair, from a financial standpoint,
to the Company and its Subsidiaries.

               (h) Stockholder Approval. If required by law, Nasdaq rules or
otherwise, the Company shall have obtained approval of the issuance of the Notes
and the Conversion Shares by the Company's stockholders holding a majority of
the outstanding shares of Common Stock entitled to vote in person or by proxy.

     6. COVENANTS OF THE COMPANY.

          So long as the aggregate principal amount of the Note outstanding is
greater than or equal to one million dollars ($1,000,000), the Company shall
observe and perform the following covenant:

          6.1 Incurrence of Indebtedness. The Company shall not incur, directly
or indirectly, any Indebtedness which is equal or senior in ranking to the Note
without the written consent of Purchaser.

     7. MISCELLANEOUS.

          7.1 Stockholder Approval. At any meeting of the stockholders of the
Company at which approval of the issuance of the Note has been submitted for
stockholder action, Purchaser hereby agrees to vote all of the shares of Common
Stock it is entitled to vote in person or by proxy at such meeting authorizing
the issuance of the Note.

          7.2 Termination. This Agreement may be terminated by written notice by
one party to the other if the Closing Date has not occurred (other than through
the failure of the party seeking to terminate this Agreement to comply fully
with its obligations under this Agreement) on or before September 1, 2001, or
such later date as the parties hereto may agree in writing. If this Agreement is
terminated pursuant to this Section 7.2, all further obligations of the parties
under this Agreement will terminate, except that the obligations in Section 7.3
hereof will survive.

          7.3 Proprietary Information.

               (a) Protection of Proprietary Information. The Company and
Purchaser hereby agree that if the Company provides (or prior to the execution
of this Agreement, has provided) any Proprietary Information to Purchaser, such
Proprietary Information shall be held in confidence, and Purchaser shall afford
such Proprietary Information the same care and protection as it affords
generally to its own confidential and proprietary information (which in any case
shall be not less than reasonable care) in order to avoid disclosure to or
unauthorized use by any third party.

               (b) Ownership of Proprietary Information. All Proprietary
Information, unless otherwise specified in writing, shall remain the property of
the Company, shall be used by Purchaser only for the intended purpose, and such

                                       9



written Proprietary Information, including all copies thereof, shall be returned
to the Company or destroyed after Purchaser's need for it has expired or upon
the request of the Company. Proprietary Information shall not be reproduced
except to the extent necessary to accomplish the purpose and intent of this
Agreement, or as otherwise may be permitted in writing by the Company.

               (c) Exceptions. The foregoing provisions of this Section 7.3
shall not apply to any Proprietary Information which (i) becomes publicly
available other than through Purchaser; (ii) is required to be disclosed by a
governmental or judicial law, order, rule or regulation; (iii) is developed
independently by Purchaser; (iv) becomes available to Purchaser without
restriction from a third party; or (v) becomes relevant to the settlement of any
dispute or enforcement of either party's rights under this Agreement in
accordance with the provisions of this Agreement, in which case appropriate
protective measures shall be taken to preserve the confidentiality of such
Proprietary Information as fully as possible within the confines of such
settlement or enforcement process. If any Proprietary Information is required to
be disclosed pursuant to the foregoing clause (ii), Purchaser shall promptly
inform the Company in writing of the requirements of such disclosure.

               (d) Permitted Disclosures. Notwithstanding the foregoing,
Purchaser may disclose Proprietary Information to its employees, agents, and
legal, financial, and accounting advisors and providers (including its lenders
and other financiers) to the extent necessary or appropriate in connection with
the negotiation and/or performance of this Agreement or its obtaining of
financing, provided; that each such party is notified of the confidential and
proprietary nature of such Proprietary Information and is subject to or agrees
to be bound by similar restrictions on its use and disclosure of Proprietary
Information.

          7.4 Governing Law. This Agreement shall be governed in all respects by
the laws of the Commonwealth of Pennsylvania, regardless of conflicts of laws
principles.

          7.5 Successors and Assigns. Except as otherwise expressly provided
herein, the provisions hereof shall inure to the benefit of, and be binding
upon, the successors, assigns, heirs, executors and administrators of the
parties hereto and shall inure to the benefit of and be enforceable by each
Person who shall be a holder of the Note from time to time. The Note and the
rights of the holder of the Note under this Agreement are fully assignable: (a)
to Affiliates of the holder without the prior approval of the Company; and (b)
to third parties without the prior approval of the Company.

          7.6 Entire Agreement. This Agreement, the Exhibits and Schedules
hereto and the other documents delivered pursuant hereto constitute the full and
entire understanding and agreement between the parties with regard to the
subjects hereof and no party shall be liable or bound to any other in any manner
by any representations, warranties, covenants and agreements except as
specifically set forth herein and therein.

          7.7 Severability. In case any provision of the Agreement shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

          7.8 Amendment and Waiver. This Agreement may be amended or modified
only upon the written consent of the Company and the holder of the Note. The
obligations of the Company and the rights of the holder of the Note under the
Agreement may be waived only with the written consent of the holder of the Note.

                                       10



          7.9 Notices. All notices and other communications hereunder shall be
in writing and shall be deemed given (as of the time of delivery or, in the case
of a telecopied communication, of confirmation and accompanied by another manner
of giving notice provided in this Section 7.9) if delivered personally,
telecopied (which is confirmed) or sent by overnight courier (providing proof of
delivery) to the parties at the following addresses (or at such other address
for a party as shall be specified by like notice):

                  if to the Company, to:

                  NEON Communications, Inc.
                  2200 West Park Drive
                  Westborough, MA  01581
                  Attention:  Stephen A. Bogiages, General Counsel
                  Facsimile Number:  (508) 616-7895
                  with a copy to:

                  Paul, Hastings, Janofsky & Walker LLP
                  1055 Washington Boulevard
                  Stamford, CT  06901
                  Attention:  Esteban A. Ferrer, Esq.
                  Facsimile Number:  (203) 359-3031

                  if to Purchaser, to:

                  Exelon Enterprises Management, Inc.
                  2301 Market Street
                  Philadelphia, PA  19101
                  Attention:  President
                  Facsimile:  (215) 841-6374

                  with a copy to:

                  Exelon Business Services Legal
                  2301 Market Street, 23rd Floor
                  Philadelphia, PA  19103
                  Attention:  John Halderman, Esq.
                  Facsimile:  (215) 841-4474


          7.10 Expenses. Each party shall pay the costs and expenses that it
incurs with respect to the negotiation, execution, delivery and performance of
the Agreement.

          7.11 Titles and Subtitles. The titles of the sections and subsections
of the Agreement are for convenience of reference only and are not to be
considered in construing this Agreement.

          7.12 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be an original, but all of which together
shall constitute one instrument.

                                       11



          7.13 Pronouns. All pronouns contained herein, and any variations
thereof, shall be deemed to refer to the masculine, feminine or neutral,
singular or plural, as to the identity of the parties hereto may require.

              [THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]



                                       12




         In Witness Whereof, the parties hereto have executed this Agreement as
of the date set forth in the first paragraph hereof.

COMPANY:                                     PURCHASER:

NEON COMMUNICATIONS, INC.                    EXELON ENTERPRISES MANAGEMENT, INC.


By:   /s/ Stephen E. Courter                 By:  /s/ Robert A. Shinn
      --------------------------------            ------------------------------
Name:     Stephen E. Courter                 Name:    Robert A. Shinn
      --------------------------------            ------------------------------
Title:    Chief Executive Officer            Title:   President
      --------------------------------            ------------------------------

Address:  2200 West Park Drive               Address: 2301 Market Street
          Westborough, MA 01581                       Philadelphia, PA  19103



                SUBORDINATED CONVERTIBLE NOTE PURCHASE AGREEMENT
                                 SIGNATURE PAGE



                                   SCHEDULE 1


                             SCHEDULE OF EXCEPTIONS


Section 3.3
-----------

Listing Application for Additional Shares to be filed with the NASD, Inc.

Waiver of Right of First Refusal by CEC under Section 5.05 of the Subscription
Agreement between the Company and CEC dated as of November 23, 1999, and as
amended on May 1, 2000 and September 5, 2000.


Section 3.5
-----------

On May 7, 2001, Neon Optica, Inc. was named as defendant in a case entitled
Fiber Optek Interconnect Corp. v. Neon Optica, Inc. f/k/a Northeast Optic
Network, Inc. The Complaint, which was filed in New York State Supreme Court in
Westchester County on May 7, 2001, sought damages of $24 million related to its
construction contracts with the defendants. During settlement discussions
between Fiber Optek and the Company, Fiber Optek agreed to the dismissal of the
lawsuit without prejudice. On May 16, 2001, Fiber Optek filed a "Voluntary
Discontinuance Without Prejudice" and on June 8, 2001, the Company filed a
Notice of Removal of the case to the U.S. District Court for the Southern
District of New York. On July 30 ,2001, the Company moved to dismiss the action
based on Fiber Optek's May 16, 2001 "Voluntary Discontinuance Without
Prejudice". To date, Fiber Optek has filed mechanics' liens in White Plains,
Rye, New Rochelle, and Harrison, New York upon real property of the Company in
such locations, including optical cable networks and license agreements. While
it is not possible to predict the ultimate outcome of the Company's negotiations
with Fiber Optek, the Company believes that this matter will not have a Material
Adverse Effect.

On July 18, 2001, the Company's agent was served by a complaint filed by Stephen
F. and Joan Pach of East Haddam, Connecticut, in the Middlesex District of the
Connecticut Superior Court, alleging trespass and damage to their property in
the Company's installation and use of a fiber optic cable on an easement owned
by Northeast Utilities traversing the Pach property. The Company is required to
answer the complaint on August 14, 2001 and expects to contest the claim. While
it is not possible to predict the ultimate outcome of this claim, the Company
believes that this matter will not have a Material Adverse Effect.





                                    EXHIBIT A


                          SUBORDINATED CONVERTIBLE NOTE




                                    EXHIBIT B


               AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT





                                    EXHIBIT C

                    AMENDMENT NO. 1 TO STOCKHOLDERS AGREEMENT
                                    EXHIBIT D

                    AMENDMENT NO. 3 TO SUBSCRIPTION AGREEMENT




                                    EXHIBIT E


                          REGISTRATION RIGHTS AGREEMENT





                                    EXHIBIT F

                              TERMINATION AGREEMENT




                                    EXHIBIT G

                             NEON OPINION OF COUNSEL



                                                                       EXHIBIT B

THIS NOTE AND THE  SHARES  OF COMMON  STOCK OF NEON  COMMUNICATIONS,  INC.  (THE
"COMMON  STOCK")  ISSUABLE  UPON  CONVERSION OF THIS NOTE HAVE BEEN ACQUIRED FOR
INVESTMENT  PURPOSES ONLY AND MAY NOT BE  TRANSFERRED  UNTIL (i) A  REGISTRATION
STATEMENT  UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE  "SECURITIES  ACT")
SHALL HAVE BECOME  EFFECTIVE WITH RESPECT THERETO OR (ii) RECEIPT BY THE COMPANY
OF AN OPINION OF COUNSEL  REASONABLY  SATISFACTORY  TO THE COMPANY TO THE EFFECT
THAT  REGISTRATION  UNDER THE SECURITIES ACT IS NOT REQUIRED IN CONNECTION  WITH
SUCH PROPOSED TRANSFER NOR IS SUCH TRANSFER IN VIOLATION OF ANY APPLICABLE STATE
SECURITIES  LAWS. THIS LEGEND SHALL BE ENDORSED UPON ANY NOTE ISSUED IN EXCHANGE
FOR THIS NOTE OR ANY SHARES OF COMMON STOCK  ISSUABLE  UPON  CONVERSION  OF THIS
NOTE.

THIS NOTE AND THE RIGHTS AND OBLIGATIONS OF THE COMPANY AND HOLDER HEREUNDER ARE
SUBJECT TO THE  SUBORDINATION  PROVISIONS SET FORTH IN SECTION 3 HEREOF.  IN THE
EVENT OF A CONFLICT BETWEEN ANY TERMS OF THIS NOTE AND THE TERMS OF SUCH SECTION
3, THE TERMS OF SECTION 3 SHALL GOVERN.

        ________________________________________________________________

                            NEON COMMUNICATIONS, INC.



                   18% Subordinated Convertible Note Due 2008


$11,500,000.00                                        Westborough, Massachusetts
                                                                 August 10, 2001


     NEON  COMMUNICATIONS,  INC., a Delaware  corporation (the  "Company"),  for
value  received,  hereby  promises  to pay to the  order of  EXELON  ENTERPRISES
MANAGEMENT,  INC., a Pennsylvania corporation,  or its designee or assignee (the
"Holder"),  on August 15,  2008 (the  "Maturity  Date"),  at the  offices of the
Company,  the  principal  sum of Eleven  Million Five Hundred  Thousand  Dollars
($11,500,000.00)  or such  lesser  principal  amount  as shall  at such  time be
outstanding  hereunder  (the  "Principal  Amount").  Each payment by the Company
pursuant to this Note shall be made in lawful  currency of the United  States of
America and in immediately  available funds.  Interest on this Note shall accrue
weekly and compound  annually on the Principal  Amount  outstanding from time to
time at a rate per annum computed in accordance with Section 4 hereof.

     Accrued  and  unpaid  interest  on  the  Principal   Amount  of  this  Note
outstanding  shall commence on the date hereof and be payable:  (i) semiannually
on February 15 and August 15 of each year beginning on August 15, 2001, and (ii)
upon maturity (whether at the Maturity Date, by acceleration or otherwise). Each
of the  dates  referred  to above is  sometimes  hereinafter  referred  to as an
"Interest  Payment Date." All  computations of interest  hereunder shall be made
based on the actual number of days elapsed in a year of 360 days  (including the
first day but excluding the last day during which any such  Principal  Amount is
outstanding).  The Principal  Amount of this Note together with interest accrued
and unpaid  thereon  shall be payable on the Maturity Date (or such earlier date
on which such amount may become due and payable under Section 7.2 hereof) unless
this Note is converted in accordance with Section 6 hereof.



     All payments by the Company hereunder shall be applied first to pay any
interest which is due, but unpaid, and then to reduce the Principal Amount.

     The Company waives presentment, demand, protest or notice of any kind in
connection with this Note.

     This Note is issued pursuant to a Convertible Note Purchase Agreement dated
the date of this Note between the Company and the Holder (the "Purchase
Agreement"). Notwithstanding any provision to the contrary contained herein,
this Note is subject and entitled to those terms, conditions, covenants and
agreements contained in the Purchase Agreement which are expressly applicable to
the Note.

     1. Definitions. For purposes of this Note, the following terms shall have
the meanings described below:

          1.1 "Affiliate" of any specified Person means any other Person,
directly or indirectly, controlling or controlled by or under direct or indirect
common control with such specified Person. For the purposes of this definition
"control" when used with respect to any Person means the power to direct the
management and policies of such Person, directly or indirectly, whether through
the ownership of voting securities, by contract or otherwise and the terms
"controlling" and "controlled" have meanings correlative to the foregoing.

          1.2 "Bankruptcy Law" means 11 U.S.C.ss.101 et seq. as from time to
time hereafter amended, and any successor or similar Federal or state law for
the relief of debtors.

          1.3 "Board of Directors" means the Company's Board of Directors.

          1.4 "Capital Stock" of any Person means any and all shares, interests,
rights to purchase, warrants, options, participation or other equivalents of or
interests in (however designated) equity of such Person, including any preferred
stock, but excluding any debt securities convertible into such equity.

          1.5 "Change of Control" means the occurrence of any of the following
events:

               (i) any "person" (as such term is used in Sections 13(d) and
14(d) of the Exchange Act), other than one or more Permitted Holders, is or
becomes the beneficial owner (as defined in Rules 13d-3 and 13d-5 under the
Exchange Act, except that for purposes of this clause (i) such person shall be
deemed to have "beneficial ownership" of all shares that such person has the
right to acquire, whether such right is exercisable immediately or only after
the passage of time), directly or indirectly, of more than 35% of the total
voting power of the Voting Stock of the Company; provided, however, that the
Permitted Holders beneficially own (as defined in Rules 13d-3 and 13d-5 under
the Exchange Act), directly or indirectly, in the aggregate a lesser percentage
of the total voting power of the voting Stock of the Company than such other
person and do not have the right or ability by voting power, contract or
otherwise to elect or designate for election a majority of the Board of
Directors (for the purposes of this clause (i), such other person shall be
deemed to beneficially own any Voting Stock of a specified corporation held by
another person ("a parent corporation"), if such other person is the beneficial
owner (as described in this clause (i)), directly or indirectly, of more than
35% of the voting power of the Voting Stock of such parent corporation and the

                                       2



Permitted Holders  beneficially own (as described in this clause (i)),  directly
or indirectly,  in the aggregate a lesser  percentage of the voting power of the
Voting Stock of such parent  corporation and do not have the right or ability by
voting  power,  contract  or  otherwise  to elect or  designate  for  election a
majority of the board of directors of such parent corporation);

               (ii) individuals who on the date of this Note constituted the
Board of Directors (together with any new directors whose election by such Board
of Directors or whose nomination for election by the shareholders of the Company
was approved by a vote of 66-2/3% of the directors of the Company then still in
office who were either directors on the date of this Note or whose election or
nomination for election was previously so approved) cease for any reason to
constitute a majority of the Board of Directors then in office;

               (iii) the adoption of a plan relating to the liquidation or
dissolution of the Company; or

               (iv) the merger or consolidation of the Company with or into
another Person or the merger of another Person with or into the Company, or the
sale of all or substantially all the assets of the Company to another Person
(other than a Person that is controlled by the Permitted Holders), and, in the
case of any such merger or consolidation, the securities of the Company that are
outstanding immediately prior to such transaction and which represent 100% of
the aggregate voting power of the Voting Stock of the Company are changed into
or exchanged for cash, securities or property, unless pursuant to such
transaction such securities are changed into or exchanged for, in addition to
any other consideration, securities of the surviving Person or transferee that
represent immediately after such transaction, at least a majority of the
aggregate voting power of the Voting Stock of the surviving Person or
transferee.

          1.6 "Common Stock Equivalent" means any Convertible Security or
warrant, option or other right to subscribe for or purchase any additional
shares of Common Stock or any Convertible Security, other than options granted
to officers, directors or employees of, or consultants to, the Company, or any
of its subsidiaries and approved by the Board of Directors.

          1.7 "Convertible Security" means any evidence of indebtedness, shares
of capital stock or other securities which may be at any time convertible into
or exchanged for additional shares of Common Stock.

          1.8 "Custodian" means any receiver, trustee, assignee, liquidator,
custodian or similar official under any Bankruptcy Law.

          1.9 "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

          1.10 "Excluded Securities" means any Common Stock Equivalent issued by
the Company (i) pursuant to a private placement of public equity with Ramius
Securities, LLC, or in connection with an equity line of credit up to an
aggregate amount of $25,000,000, in either case approved by the Board of
Directors of the Company; and (ii) in the case of clause (i) hereof, any Common
Stock issuable upon the conversion or exercise of any such Common Stock
Equivalent.

                                       3



          1.11 "Exelon" means Exelon Enterprises Management, Inc., a
Pennsylvania corporation.

          1.12 "Indenture" means the Indenture dated as of August 5, 1998,
between the Company and U.S. Bank Trust National Association.

          1.13 "Market Price" as of any valuation date, (i) means the last
reported sale price for the shares of Common Stock, as reported on the National
Association of Securities Dealers Automated Quotation System ("Nasdaq") , or, if
the Common Stock is listed on a stock exchange, the principal stock exchange on
which the Common Stock is listed, on the last trading day prior to the
applicable valuation date for which a closing price is available; or (ii) if the
Common Stock on any such valuation date is not reported on Nasdaq or listed on
any stock exchange, the Market Price shall be the fair market value as
reasonably determined in good faith by the Board of Directors of the Company.
The manner of determining the Market Price of the Common Stock set forth in the
foregoing definition shall apply with respect to any other security in respect
of which a determination as to market value must be made hereunder.

          1.14 "Mode 1" means Mode 1 Communications, Inc., a Connecticut
corporation.

          1.15 "Permissible Securities" means equity securities or subordinated
securities of the Company or any successor obligor of the Senior Debt or
Subordinated Debt provided for by a plan of reorganization or readjustment that
are subordinated in right of payment to all Senior Debt that may at the time be
outstanding to the same extent as, or to a greater extent than, the Subordinated
Debt is subordinate to the Senior Debt as provided in Section 3 hereof.

          1.16 "Permitted Holders" means (i) Central Maine Power Company, a
Maine corporation, and its Affiliates and (ii) Northeast Utilities, a
Massachusetts business trust, and its Affiliates.

          1.17 "Person" means any individual, corporation, partnership, limited
liability company, joint venture, association, joint-stock company, trust,
unincorporated organization, government or any agency or political subdivision
thereof or any other entity.

          1.18 "Prepayment Amount" means such amount being prepaid by the
Company prior to the second anniversary of the date of this Note in accordance
with the terms of Section 2 hereof.

          1.19 "Prepayment Penalty" means an amount equal to the interest that
would have accrued on the Prepayment Amount for the next four (4) months after
the date of any prepayment had such Prepayment Amount remained outstanding.

          1.20 "Registration Rights Agreement" means the Registration Rights
Agreement between the Company and Exelon dated the date hereof.

          1.21 "Senior Debt" means, collectively, (i) the 12 3/4% Senior Notes
Due 2008 in the aggregate principal amount of One Hundred Eighty Million Dollars
($180,000,000.00) issued by the Company pursuant to the Indenture; (ii) all
other indebtedness incurred after the issuance of the Note which by its terms is

                                       4



superior in right of payment to the Note;  and (iii) all payment  obligations of
the  Company  pursuant  to any  indebtedness  incurred  in order to finance  the
acquisition  of fixed or capital  assets,  unless by the terms of the instrument
creating or evidencing any such indebtedness it is expressly  provided that such
indebtedness is not superior in right of payment to the Note, provided, however,
that in the  case of each of (ii)  and  (iii),  such  indebtedness  and  payment
obligations   shall  constitute  Senior  Debt  only  to  the  extent  that  such
indebtedness and payment  obligations shall have been approved in writing by the
Holder as required by Section 6.1 of the Purchase Agreement.

          1.22 "Significant Subsidiary" shall have the meaning ascribed to it in
the Indenture.

          1.23 "Subordinated Debt" means the principal amount of the
indebtedness evidenced by this Note, together with any interest or premium due
thereon or payable with respect thereto; and the principal amount of
indebtedness evidenced by the Subordinated Convertible Note due 2008 issued by
the Company to Mode 1 on June 15, 2001.

          1.24 "Voting Stock" of a Person means all classes of Capital Stock or
other interests (including partnership interests) of such Person then
outstanding and normally entitled (without regard to the occurrence of any
contingency) to vote in the election of directors, managers or trustee thereof.

     2. Prepayment. The Principal Amount of this Note may not be prepaid in
whole or in part prior to the second anniversary of the date of this Note
without the prior written consent of the Holder. Notwithstanding the foregoing,
the Company may prepay this Note prior to such date without the consent of the
Holder in connection with a merger of the Company or a sale of all or
substantially all of its assets, provided the Company pays to Holder the
Prepayment Penalty. The Principal Amount of this Note may be prepaid in whole or
in part on or after the second anniversary of the date of this Note without the
consent of the Holder and without any Prepayment Penalty.

     3. Subordination. The Company, for itself, its successors and assigns,
covenants and agrees, and the Holder and each successive holder of this Note, by
its acceptance of this Note, likewise covenants and agrees (expressly for the
benefit of the present and future holders of the Senior Debt), that the payment
of principal of, and interest on, this Note is hereby expressly subordinated in
right of payment, to the extent and in the manner set forth in this Section 3,
to the prior payment in full of the principal of, premium (if any) and interest
on, all Senior Debt of the Company, whether outstanding on the date hereof or
hereafter incurred or created.

          3.1 Default on Senior Debt. The Company shall not purchase,
repurchase, redeem, defease or otherwise acquire or retire any of the
Subordinated Debt prior to its scheduled maturity or scheduled payment (a
"Restricted Payment") if an event of default in respect of the Senior Debt or an
event which after notice or the passage of time or both would be such an event
of default (a "Senior Debt Default") shall have occurred and be continuing or if
such a Senior Debt Default would result from such a Restricted Payment.

                                       5


          3.2 Dissolution, Liquidation, Reorganization, etc. Upon any payment or
distribution of the assets of the Company of any kind or character, whether in
cash, property or securities, to creditors upon any dissolution, winding-up,
total or partial liquidation, reorganization, composition, arrangement,
adjustment or readjustment of the Company or its securities (whether voluntary
or involuntary, or in bankruptcy, insolvency, reorganization, liquidation or
receivership proceedings, or upon a general assignment for the benefit of
creditors, or any other marshalling of the assets and liabilities of the
Company, or otherwise), then and in any such event:

               (i) the holders of the Senior Debt shall be entitled to receive
payment in full in cash or cash equivalents (or to have such payment duly
provided for in a manner reasonably satisfactory to the holders of Senior Debt)
of all amounts due or to become due on or in respect of all Senior Debt, before
any payment or distribution, whether in cash, property or securities (other than
Permissible Securities), is made on account of the Subordinated Debt;

               (ii) the Subordinated Debt shall forthwith become due and
payable, and any payment or distribution of assets of the Company of any kind or
character, whether in cash, property or securities (other than Permissible
Securities), to which the Holder would be entitled except for the provisions of
this Section 3, shall be paid or delivered by any debtor, custodian, liquidating
trustee, agent or other Person making such payment or distribution, directly to
the holders of the Senior Debt, or their representative or representatives,
ratably according to the aggregate amounts remaining unpaid on account of such
Senior Debt, for application to the payment thereof, to the extent necessary to
pay all such Senior Debt in full in cash or cash equivalents after giving effect
to any concurrent payment or distribution, or provision therefor, to the holders
of such Senior Debt;

               (iii) Each holder of the Subordinated Debt at the time
outstanding hereby irrevocably authorizes and empowers each holder of the Senior
Debt or such holder's representative to collect and receive such holder's
ratable share of all such payments and distributions and to receipt therefor,
and, if any holder of Subordinated Debt fails to file a claim at least seven (7)
calendar days prior to the date established by rule of law or order of court for
such filing, to file and prove (but not to vote) such claims therefor.

Upon any payment or distribution of assets of the Company referred to in this
Section 3, the holders of the Subordinated Debt shall be entitled to rely upon
any order or decree made by any court of competent jurisdiction in which such
bankruptcy, insolvency, reorganization, liquidation, receivership or other
proceeding is pending, or a certificate of the debtor, custodian, liquidating
trustee, agent or other Person making any such payment or distribution to such
holders, for the purpose of ascertaining the Persons entitled to participate
therein, the holders of the Senior Debt, the then outstanding principal amount
of the Senior Debt and any and all amounts payable thereon, the amount or
amounts paid or distributed thereon and all other facts pertinent thereto or to
this Section 3.

     4. Interest.

          4.1 Interest Rate. The outstanding Principal Amount shall bear
interest at the rate of eighteen percent (18%) per annum, which shall accrue
weekly and be compounded annually.

                                       6


          4.2 Payment of Interest. At the election of the Holder, given in
writing by the Holder to the Company, accrued interest may be paid on the
applicable Interest Payment Date in any of the following forms: (i) cash, (ii)
additional 18% subordinated convertible notes due 2008, in substantially the
form of this Note; or (iii) such number of fully paid and non-assessable shares
of Common Stock determined by dividing the applicable interest payment by $5.00.
If no such election is made by the Holder with respect to an Interest Payment
Date, the interest payment due on such Interest Payment Date shall be made in
cash.

     5. Redemption.

          5.1 Optional Redemption. Subject to the Holder's right of conversion
set forth in Section 6 hereof, at any time after the second anniversary of the
date of this Note, the Company shall have the right, at its sole option and
election made in accordance with Section 5.2 below, to redeem this Note, in
whole or in part, at a redemption price equal to the then outstanding Principal
Amount relating to that portion of the Note being redeemed, together with the
related accrued and unpaid interest (the "Redemption Price").

          5.2 Redemption Procedures. Notice of any redemption of this Note
pursuant to Section 5.1 shall be mailed to the Holder at least 10 days but not
more than 60 days prior to the date fixed for redemption (the "Redemption
Date"). On or before the Redemption Date, the Holder shall surrender this Note
or the portion thereof being redeemed, duly endorsed, at the principal office of
the Company. On the Redemption Date, the Company shall wire transfer to the
Holder the Redemption Price in immediately available funds for the Notes being
so redeemed.

     6. Conversion.

          6.1 Optional Conversion. At the option of the Holder, any portion (in
increments of $1,000,000) or all of the outstanding Principal Amount of this
Note together with all accrued and unpaid interest thereon, shall be convertible
at any time and from time to time up to and including the Maturity Date, into
such number of fully paid and non-assessable shares of Common Stock as shall be
determined by Section 6.3 below.

          6.2 Mandatory Conversion. At the option of the Company, at any time
during the thirty (30) day period after the Common Stock has a Market Price
equal to or greater than twenty dollars ($20.00) for forty-five (45) or more
consecutive trading days, the Company may deliver a notice (the "Mandatory
Conversion Notice") to the Holder, providing that the Note shall automatically
be converted into such number of fully paid and non-assessable shares of Common
Stock as shall be determined by Section 6.3 below. Notwithstanding the
foregoing, the Company shall not be entitled to effect a mandatory conversion
pursuant to this Section 6.2 unless the Company has filed a registration
statement registering the Conversion Shares (as defined below) with the
Securities and Exchange Commission (the "Commission") under the Securities Act
of 1933, as amended, and such registration statement has been declared effective
by the Commission.

          6.3 Conversion Price. The number of shares of Common Stock to be
received by the Holder upon conversion of this Note in accordance with Section
6.1 or 6.2 (the "Conversion Shares") shall be determined by dividing the then

                                       7



outstanding Principal Amount of the Note together with all accrued and unpaid
interest being converted by the Holder by the Conversion Price in effect at the
time of conversion (the "Conversion Price"). The Conversion Price at which the
Conversion Shares shall be deliverable upon conversion of this Note without the
payment of additional consideration by the Holder shall initially be $5.00 per
share of Common Stock. Such Conversion Price shall be subject to adjustment as
provided in Section 6.4 below. Notwithstanding the foregoing, the Company shall
not issue on conversions of this Note an aggregate number of Conversion Shares
that, when added to (a) shares of Common Stock issuable upon conversion of
additional 18% subordinated notes due 2008 or (b) additional shares of Common
Stock, in each case, issued in payment of accrued interest pursuant to Section
4.2 hereof, would equal or exceed nineteen and ninety-nine hundredths percent
(19.99%) of the number of shares of Common Stock issued and outstanding on the
date hereof, unless the Company shall have theretofore (i) obtained the vote of
shareholders ("Shareholder Approval"), if any, as may be required by the rules
and regulations of the Nasdaq Stock Market (or successor thereto) applicable to
approve the issuance of Common Stock deemed to have been issued at a price that
is less than the greater of book or fair market value of the Common Stock, or
(ii) obtained an exemption from the requirement for Shareholder Approval from
the Nasdaq Stock Market (a "Nasdaq Exemption").

          6.4 Adjustment of Conversion Price. The Conversion Price in effect at
any time and the number and kind of securities issuable upon conversion of the
Notes shall be subject to adjustment from time to time upon the happening of
certain events as follows:

               (i) Adjustment for Stock Splits and Combinations. If the Company
at any time or from time to time after the date of this Note effects a
subdivision of shares of its Common Stock, the number of Conversion Shares
issuable to the Holder immediately before that subdivision shall be
proportionately increased (as at the effective date of such subdivision, or if
the Company shall take a record of holders of its Common Stock for the purpose
of so subdividing, as at the applicable record date, whichever is earlier) to
reflect the increase in the total number of shares of Common Stock outstanding
as a result of such subdivision, and conversely, if the Company at any time or
from time to time after the date of this Note combines shares of the Common
Stock into a smaller number of shares, the number of shares of Conversion Stock
issuable to the Holder immediately before the combination shall be
proportionately decreased (as at the effective date of such combination, or if
the Company shall take a record of holders of its Common Stock for the purpose
of so combining, as at the applicable record date, whichever is earlier) to
reflect the reduction in the total number of shares of Common Stock outstanding
as a result of such combination. Any adjustment under this clause (i) shall
become effective at the close of business on the date the subdivision or
combination becomes effective.

               (ii) Adjustment for Certain Dividends and Distributions. If the
Company at any time or from time to time after the date of this Note makes, or
fixes a record date for the determination of holders of shares of the Common
Stock entitled to receive a dividend or other distribution payable in additional
shares of the Common Stock, then and in each such event, the number of
Conversion Shares issuable to the Holder shall be increased as of the time of
such issuance, or, in the event such record date is fixed, as of the close of
business on such record date, by multiplying the number of Conversion Shares
issuable to the Holder by a fraction (A) the numerator of which shall be the

                                       8



total number of shares of the Common Stock issued and outstanding immediately
prior to the time of such issuance or the close of business on such record date
plus the number of shares of the Common Stock issuable in payment of such
dividend or distribution and (B) the denominator of which is the total number of
shares of the Common Stock issued and outstanding immediately prior to the time
of such issuance or the close of business on such record date.

               (iii) Adjustments for Other Dividends and Distributions. In the
event the Company at any time or from time to time after the date of this Note
makes, or fixes a record date for the determination of holders of shares of the
Common Stock entitled to receive a dividend or other distribution payable in
securities of the Company other than the shares of the Common Stock, including
but not limited to indebtedness, or in securities of any wholly-owned subsidiary
of the Company then and in each such event, provision shall be made so that the
Holder, upon conversion of this Note, shall receive upon conversion thereof, in
addition to the number of Conversion Shares receivable thereupon, the amount of
securities of the Company or of the applicable subsidiary which the Holder would
have received had Holder been a holder of Common Stock on the date of such event
and had thereafter, during the period from the date of such event to and
including the date of conversion, retained such securities receivable as
aforesaid during such period, subject to all other adjustments called for during
such period under this Section 6.4 with respect to the rights of the Holder.

               (iv) Adjustment for Reorganization, Consolidation, Merger. In the
event of any reorganization of the Company (or any other corporation, the stock
or other securities of which are at the time receivable upon the conversion of
this Note) after the date hereof, or if, after such date, the Company (or any
such other corporation) shall consolidate with or merge into another corporation
or convey all or substantially all its assets to another corporation, then and
in each such case the Holder, upon the conversion hereof as provided in Section
6.1 or 6.2, at any time after the consummation of such reorganization,
consolidation, merger or conveyance, shall be entitled to receive, in lieu of
the stock receivable upon the conversion of this Note prior to such
consummation, the stock or other securities or property to which such Holder
would have been entitled upon such consummation if such Holder had converted
this Note immediately prior thereto.

               (v) Adjustment for Reclassification, Exchange and Substitution.
In the event that at any time or from time to time after the date of this Note,
the shares of the Common Stock are changed into the same or a different number
of shares of any class of stock, whether by recapitalization, reclassification
or otherwise (other than a subdivision or combination of shares or stock
dividend or a reorganization, merger, consolidation or sale of assets, provided
for elsewhere in this Section 6.4), then and in any such event the kind and
amount of stock and other securities and property receivable upon such
recapitalization, reclassification or other change shall be used for calculation
of the number of Conversion Shares issuable to the Holder, all subject to
further adjustment as provided in this Note.

               (vi) Adjustment for Issuance of Rights or Warrants. In the event
that at any time or from time to time after the date of this Note, the Company
issues warrants or other rights to purchase Common Stock to all holders of its
Common Stock entitling them to purchase shares of Common Stock at a price below
the then-current Market Price, and such purchase price is below the Conversion

                                       9



Price, the Conversion Price shall thereafter be decreased to such purchase
price.

               (vii) Adjustment for Issuance of Common Stock Equivalents. In the
event that the Company at any time prior to February 10, 2002 issues any Common
Stock Equivalent, other than Excluded Securities, and the price per share for
which additional shares of Common Stock may be issuable thereafter pursuant to
such Common Stock Equivalent shall be less than the Conversion Price then in
effect, then the Conversion Price shall thereafter be decreased to such purchase
price. Upon the expiration or termination of the right to convert, exchange or
exercise any Common Stock Equivalent the issuance of which affected an
adjustment pursuant to this paragraph (vii), to the extent such Common Stock
Equivalent shall not have been converted, exercised or exchanged in its
entirety, then the Conversion Price shall forthwith be readjusted and thereafter
be the price which it would have been (but reflecting any other adjustments in
the Conversion Price made pursuant to the provisions of this Section 6.4 after
the issuance of such Common Stock Equivalent) prior to the issuance of such
Common Stock Equivalent.

               (viii) Certificate of Chief Financial Officer as to Adjustment.
In each case of an adjustment of the Common Stock, upon the request of the
Holder, the Company shall compute such adjustment in accordance with the
provisions of this Note and prepare a certificate setting forth such adjustment,
and showing in detail the facts upon which such adjustment is based.

          6.5 Fractional Shares. No fractional shares of Common Stock shall be
issued upon conversion of this Note. The determination of fractional shares
shall be made on the basis of the converted amount of Principal Amount of this
Note plus accrued and unpaid interest at the time of conversion divided by the
Conversion Price. In lieu of any fractional shares to which the Holder would
otherwise be entitled, the Company shall pay cash equal to such fraction
multiplied by the Conversion Price, immediately in effect prior to the event
which would result in the issuance of a fractional share of Common Stock.

          6.6 Mechanics of Conversion. Upon election of the Holder to convert
this Note into Conversion Shares pursuant to Section 6.1, or upon mandatory
conversion at the option of the Company pursuant to Section 6.2, the Holder
shall surrender this Note or portion thereof, duly endorsed, at the office of
the Company, and shall give written notice to the Company at its principal
corporate office, of the election to convert the same (if applicable) and shall
state therein the name or names in which the certificate or certificates for the
Conversion Shares are to be issued. The Company shall, as soon as practicable
thereafter, issue and deliver to the Holder, or to the nominee or nominees of
the Holder, a certificate or certificates for the number of Conversion Shares to
which such holder shall be entitled as aforesaid. Such conversion shall be
deemed to have been made immediately prior to the close of business on the date
of such surrender of this Note to be converted, and the person or persons
entitled to receive the Conversion Shares issuable upon such conversion shall be
treated for all purposes as the record holder or holders of such shares of
Common Stock as of such date. In the event that only a portion of this Note is
converted into Conversion Shares, the Company shall issue a new Note to the
Holder evidencing the reduced Principal Amount after the partial conversion.

                                       10


     7. Events of Default.

          7.1 Events Constituting An Event of Default. Each of the following
described events shall constitute an "Event of Default" under this Note:

               (i) Interest Payment Default. The Company defaults in any payment
of interest on this Note when the same becomes due and payable and such default
continues for a period of thirty (30) days;

               (ii) Principal Payment Default. The Company defaults in the
payment of the Principal Amount when the same becomes due and payable on the
Maturity Date, upon required repurchase or otherwise.

               (iii) Covenant Default. The Company fails to perform or observe
any of the provisions contained in this Note, the Purchase Agreement or in the
Registration Rights Agreement and such failure shall continue for more than
sixty (60) days after the Holder has given written notice to the Company; or

               (iv) Default on Other Indebtedness. The Company or any
Significant Subsidiary shall fail to pay any indebtedness of the Company or such
Subsidiary (including without limitation the Senior Debt within any applicable
grace period after final maturity or such indebtedness is accelerated by the
holders thereof because of a default and the total amount of such indebtedness
unpaid or accelerated exceeds $5,000,000 or its foreign currency equivalent at
the time;

               (v) Judgments. Any judgment or decree for the payment of money in
excess of $5,000,000 or its foreign currency equivalent at the time it is
entered against the Company or any Significant Subsidiary, remains outstanding
for a period of 60 days following the entry of such judgment or decree and is
not discharged, waived or the execution thereof stayed within 10 days after the
Holder has given written notice to the Company.

               (vi) Consent to Bankruptcy. The Company or any Significant
Subsidiary pursuant to or within the meaning of any Bankruptcy Law:

                    (A) commences a voluntary case;

                    (B) consents to the entry of an order for relief against it
in an involuntary case;

                    (C) consents to the appointment of a Custodian of it or for
any substantial part of its property; or

                    (D) makes a general assignment for the benefit of its
creditors; or

                    (E) takes any comparable action under any foreign laws
relating to insolvency; and

                                       11


               (vii) Bankruptcy Order. A court of competent jurisdiction enters
an order or decree under any Bankruptcy Law that:

                    (A) is for relief of the Company or any Significant
Subsidiary in an involuntary case;

                    (B) appoints a Custodian of the Company or any Significant
Subsidiary or for any substantial part of its property;

                    (C) orders the winding up or liquidation of the Company or
any Significant Subsidiary; or

                    (D) any similar relief is granted under any foreign laws and
in each of (A), (B), and (C) above, the order or decree remains unstayed and in
effect for sixty (60) days.

The foregoing will constitute Events of Default whatever the reason for any such
Event of Default and whether it is voluntary or involuntary or is effected by
operation of law or pursuant to any judgment, decree or order of any court or
any order, rule or regulation of any administrative or governmental body.

          7.2 Consequences of an Event of Default. If an Event of Default (other
than an Event of Default specified in Section 7.1(vi) or Section 7.1(vii) hereof
with respect to the Company) occurs and is continuing, the Holder by notice to
the Company, may declare the Principal Amount and accrued but unpaid interest on
this Note to be due and payable. If an Event of Default specified in Section
7.1(vi) or Section 7.1(vii) hereof with respect to the Company occurs, the
Principal Amount and accrued but unpaid interest on the Note shall ipso facto
become and be immediately due and payable without any declaration or other act
on part of the Holder. The Holder may rescind an acceleration and its
consequences if the rescission would not conflict with any judgment or decree
and if all existing Events of Default have been cured or waived except
nonpayment of Principal Amount or interest that has become due solely because of
acceleration. No such rescission shall affect any subsequent Event of Default or
impair any right consequent thereto.

     8. Change of Control. (a) Upon the occurrence of a Change of Control, the
Holder shall have the right to require that the Company repurchase this Note at
a purchase price in cash equal to 101% of the Principal Amount outstanding on
the date of purchase plus accrued and unpaid interest, if any, to the date of
purchase, in accordance with the terms contemplated in section 8(b). For the
avoidance of doubt, the additional 1% included in the purchase price of the Note
upon a Change of Control shall not be considered a premium when determining the
Principal Amount of the Note for use in the computation of such purchase price.

                    (b) Within 30 days following any Change of Control, the
Company shall mail a notice to the Holder stating:

                    (1) that a Change of Control has occurred and that the
               Holder has the right to require the Company to purchase the Note

                                       12



               at a purchase price in cash equal to 101% of the Principal Amount
               on the date of purchase plus accrued and unpaid interest, if any,
               to the date of purchase;

                    (2) the circumstances and relevant facts regarding such
               Change of Control (including information with respect to pro
               forma historical income, cash flow and capitalization, each after
               giving effect to such Change of Control);

                    (3) the repurchase date (which shall be no earlier than 30
               days nor later than 60 days from the date such notice is mailed);
               and

                    (4) the instructions determined by the Company, consistent
               with this Section 8, that the Holder must follow in order to have
               the Note purchased.

                    (c) If the Holder elects to have the Note purchased, it will
be required to surrender the Note, with an appropriate form duly completed, to
the Company at the address specified in the notice at least three business days
prior to the purchase date. The Holder will be entitled to withdraw its election
if the Company receives not later than one business day prior to the purchase
date, a telegram, telex, facsimile transmission or letter setting forth the name
of the Holder, the Principal Amount which was delivered for purchase by the
Holder and a statement that such Holder is withdrawing his election to have the
Note purchased.

                    (d) On the purchase date, the Company shall pay the purchase
price plus accrued and unpaid interest, if any, to the Holder.

     9. Restrictions on Transfer.

          9.1 Generally. The Holder acknowledges that this Note and the
Conversion Shares issuable upon its conversion have not been registered or
qualified under federal or state securities laws. This Note shall not be
transferable by the Holder except in accordance with the terms and conditions
set forth in the Purchase Agreement, this Note and the Securities Act of 1933,
as amended. This Note is otherwise freely assignable by the Holder.

          9.2 No Rights or Liabilities as Stockholder. This Note does not by
itself entitle the Holder to any voting rights or other rights as a stockholder
of the Company. In the absence of conversion of this Note, no provision of this
Note, and no enumeration in this Note of the rights or privileges of the Holder
shall cause such Holder to be a stockholder of the Company for any purpose.

     10. Amendment, Waiver and Right of Set-Off.

          10.1 Amendment. The provisions of this Note may not be amended,
modified, waived, changed or terminated other than by an agreement in writing
signed by the Company and the Holder.

          10.2 Waiver. No failure or delay on the part of any party hereto in
exercising any power or right under this Note shall operate as a waiver thereof,
nor shall any single or partial exercise of any such power or right preclude any
other or further exercise thereof or the exercise of any other power or right.
No notice to or demand on the Company in any case shall entitle it to any notice

                                       13



or demand in similar or other circumstances. No waiver or approval by the Holder
shall, except as may be otherwise stated in such waiver or approval, be
applicable to subsequent transactions. No waiver or approval by the Holder shall
require any similar or dissimilar waiver or approval thereafter to be granted
hereunder.

          10.3 Right of Set Off. Notwithstanding anything to the contrary in
this Note, (including without limitation the subordination provisions of Section
3 of this Note), the Purchase Agreement or any other agreement or document, if
the Holder is Exelon, then Exelon shall have the absolute and unconditional
right at any time and from time to time to set off against the Company's
indebtedness under this Note any obligation or liability that Exelon may have to
the Company and NEON Optica, Inc. (collectively, "NEON") under the Termination
Agreement of even date herewith between NEON and Exelon.

     11. Miscellaneous.

          11.1 Registered Holder. The Company may consider and treat the person
in whose name this Note shall be registered as the absolute owner thereof for
all purposes whatsoever (whether or not this Note shall be overdue) and the
Company shall not be affected by any notice to the contrary. In case of transfer
of this Note by operation of law, the transferee agrees to notify the Company of
such transfer and of its address, and to submit appropriate evidence regarding
such transfer so that this Note may be registered in the name of the transferee.
This Note is transferable only on the books of the Company by the holder hereof,
in person or by attorney, on the surrender hereof, duly endorsed. Communications
sent to any registered owner shall be effective as against all holders or
transferees of the Note not registered at the time of sending the communication.

          11.2 Costs of enforcement. The Company shall reimburse the Holder for
all reasonable documented costs and expenses, including reasonable attorneys'
fees, incurred by the Holder to enforce the provisions hereof and collect the
Company's obligations hereunder.

          11.3 Governing Law. This Note shall be governed by, and construed in
accordance with, the laws of the Commonwealth of Pennsylvania, without regard to
conflict of laws principles applied in the Commonwealth of Pennsylvania.

          11.4 Notices. The notice provisions under Section 7.9 of the Purchase
Agreement are applicable to this Note.

          11.5 Usury Limitation. In no event shall the amount paid or agreed to
be paid to the Holder for the use or forbearance of money to be advanced
hereunder exceed the highest lawful rate permissible under the then applicable
usury laws. If it is hereafter determined by a court of competent jurisdiction
that the interest payable hereunder is in excess of the amount which the Holder
may legally collect under the then applicable usury laws, such amount which
would be excessive interest shall be applied to the payment of the unpaid
principal balance due hereunder and not to the payment of interest or, if all
principal shall previously have been paid, promptly repaid by the Holder to the
Company.

          11.6 Severability. Every provision of this Note is intended to be
severable. If any term or provision hereof is declared by a court of competent
jurisdiction to be illegal or invalid, such illegal or invalid term or provision

                                       14



shall not affect the balance of the terms and provisions hereof, which terms and
provisions shall remain binding and enforceable.

          11.7 Terms Binding. By acceptance of this Note, the Holder of this
Note (and each subsequent Holder of this Note) accepts and agrees to be bound by
all the terms and conditions of this Note and the Purchase Agreement.

          11.8 Waiver of Jury Trial. THE HOLDER AND THE COMPANY HEREBY
KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVE ANY RIGHTS THEY MAY HAVE TO A
TRIAL BY JURY IN RESPECT OF ANY LITIGATION BASED HEREON, OR ARISING OUT OF,
UNDER, OR IN CONNECTION WITH, THIS NOTE OR ANY OTHER DOCUMENT OR INSTRUMENT
EXECUTED AND DELIVERED IN CONNECTION HEREWITH, OR ANY COURSE OF CONDUCT, COURSE
OF DEALING, STATEMENTS (WHETHER VERBAL OR WRITTEN), OR ACTIONS OF THE HOLDER OR
THE COMPANY. THIS PROVISION IS A MATERIAL INDUCEMENT FOR THE HOLDER'S PURCHASING
THIS NOTE.

          11.9 Consent of Jurisdiction. THE COMPANY IRREVOCABLY CONSENTS THAT
ANY LEGAL ACTION OR PROCEEDING AGAINST IT UNDER, ARISING OUT OF OR IN ANY MANNER
RELATING TO, THIS NOTE MAY BE BROUGHT IN ANY COURT OF THE COMMONWEALTH OF
PENNSYLVANIA LOCATED WITHIN THE EASTERN DISTRICT OF PENNSYLVANIA OR IN THE
UNITED STATES DISTRICT COURT FOR THE EASTERN DISTRICT OF PENNSYLVANIA. THE
COMPANY, BY EXECUTION AND DELIVERY OF THIS NOTE, EXPRESSLY AND IRREVOCABLY
CONSENTS AND SUBMITS TO THE PERSONAL JURISDICTION OF ANY OF SUCH COURTS IN ANY
SUCH ACTION OR PROCEEDING. THE COMPANY FURTHER IRREVOCABLY CONSENTS TO THE
SERVICE OF ANY COMPLAINT, SUMMONS, NOTICE OR OTHER PROCESS RELATING TO ANY SUCH
ACTION OR PROCEEDING BY DELIVERY THEREOF TO IT BY HAND OR BY ANY OTHER MANNER
PROVIDED FOR IN SECTION 7.9 OF THE PURCHASE AGREEMENT. THE COMPANY HEREBY
EXPRESSLY AND IRREVOCABLY WAIVES ANY CLAIM OR DEFENSE IN ANY SUCH ACTION OR
PROCEEDING BASED ON ANY ALLEGED LACK OF PERSONAL JURISDICTION, IMPROPER VENUE OR
FORUM NON CONVENIENS OR ANY SIMILAR BASIS. NOTHING IN THIS SECTION SHALL AFFECT
OR IMPAIR IN ANY MANNER OR TO ANY EXTENT THE RIGHT OF THE HOLDER TO COMMENCE
LEGAL PROCEEDINGS OR OTHERWISE PROCEED AGAINST THE COMPANY IN ANY JURISDICTION
OR TO SERVE PROCESS IN ANY MANNER PERMITTED BY LAW.

          THE COMPANY ACKNOWLEDGES AND AGREES THAT SECTIONS 11.8 AND 11.9 ARE A
SPECIFIC AND MATERIAL ASPECT OF THIS NOTE AND THAT EXELON WOULD NOT EXTEND
CREDIT TO THE COMPANY IF THE WAIVERS, CONSENTS AND AUTHORIZATIONS SET FORTH
THEREIN WERE NOT A PART OF THIS NOTE.


                                       15



          IN WITNESS WHEREOF, the Company has caused this Note to be signed in
its name by its duly authorized officer.

                                            NEON COMMUNICATIONS, INC.


                                            By:   /s/ Stephen E. Courter
                                                  ------------------------------
                                            Name:  Stephen E. Courter
                                            Title:   Chief Executive Officer




                                       16

                                                                       EXHIBIT C


                          REGISTRATION RIGHTS AGREEMENT


     THIS REGISTRATION RIGHTS AGREEMENT (the "Agreement") is made as of August
10, 2001, by and between NEON COMMUNICATIONS, INC., a Delaware corporation
("Neon") and EXELON ENTERPRISES MANAGEMENT, INC., a Pennsylvania corporation
("Exelon").

                              B A C K G R O U N D:


     Pursuant to a certain Subordinated Convertible Note Purchase Agreement
dated as of the date hereof by and between Neon and Exelon (the "Exelon Purchase
Agreement"), Exelon is purchasing and Neon is selling an 18% Subordinated
Convertible Note (the "Exelon Note"), all as more fully described in the Exelon
Purchase Agreement.

     NOW THEREFORE, in consideration of the foregoing and of the mutual promises
and covenants set forth herein, the parties hereto, intending to be legally
bound, agree as follows:

     1. Certain Definitions. As used in this Agreement, the following terms
shall have the meanings set forth below:

          (a) "Applicable Period" shall mean the time between the date on which
a Registration Statement covering the Registrable Securities has been declared
effective by the Commission and the earlier of (i) the date on which each Seller
has completed the distribution of the Registrable Securities described in the
Registration Statement or (ii) the date on which all of the Registrable
Securities held by the Sellers shall be eligible to be sold pursuant to Rule
144(k) (or any similar successor provision).

          (b) "Business Day" shall mean a day that is not a Saturday, a Sunday,
or a day on which banking institutions in New York, New York are required to be
closed.

          (c) "Closing" shall mean the closing of the transactions contemplated
by the Exelon Purchase Agreement.

          (d) "Closing Documents" shall mean this Agreement, the Exelon Purchase
Agreement, and each of the other agreements and documents delivered by Neon at
Closing.

          (e) "Commission" shall mean the United States Securities and Exchange
Commission or any other federal agency at the time administering the Securities
Act.

          (f) "Common Stock" shall mean the common stock, par value $.01 per
share, of Neon.

          (g) "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, and the rules and regulations thereunder, all as the same shall be in
effect from time to time.



          (h) "Exelon Conversion Shares" shall mean the shares of Common Stock
issuable upon conversion of the Exelon Note.

          (i) "Exelon Initial Shares" shall mean the 2,131,144 shares of Common
Stock issued to Exelon pursuant to that certain Subscription Agreement between
Neon and Exelon dated November 23, 1999 and amended as of the date hereof.

          (j) "Exelon Shares" shall mean the Exelon Conversion Shares and the
Exelon Initial Shares.

          (k) [reserved]

          (l) "Nasdaq" shall mean The Nasdaq Stock Market or any market
successor thereto.

          (m) "Permitted Transfer" shall mean (i) a sale, assignment, pledge or
transfer of the interest of Exelon, in all or any part of the Registrable
Securities to any third party, (ii) a Transfer by Exelon, to a subsidiary,
limited partnership or limited liability company, which subsidiary, limited
partnership or limited liability company is controlled by Exelon provided,
however, that each Transferee shall, prior to the Transfer of Registrable
Securities to such Transferee, execute and deliver to Neon a valid and binding
agreement in the form attached hereto as Exhibit A.

          (n) "Permitted Transferee" shall mean a transferee in a transaction
constituting a Permitted Transfer.

          (o) "Person" means an individual, partnership, limited liability
company, corporation, trust or unincorporated organization or government or
agency or political subdivision thereof.

          (p) "Prospectus" shall mean: (i) each preliminary prospectus included
in the Registration Statement filed prior to the time it becomes effective; (ii)
the form of prospectus first filed with the Commission pursuant to Rule 424(b);
(iii) all supplements thereto and (iv) amendments thereto which shall have been
declared effective by the Commission.

          (q) "Registrable Securities" shall mean (i) the Exelon Shares; (ii)
any Common Stock and any other security issued as an interest payment or other
distribution with respect to or in exchange for or in replacement of the Exelon
Shares, provided, however, that Registrable Securities shall not include any
shares of Common Stock which have been sold to the public either pursuant to the
Registration Statement or pursuant to Rule 144, which are eligible for resale
pursuant to Rule 144(k) under the Securities Act, or which have been sold in any
other transaction in which the transferor's rights under this Agreement are not
assigned.

          (r) The terms "register," "registered" and "registration" shall refer
to a registration effected by preparing and filing with the Commission a
registration statement in compliance with the Securities Act and applicable
rules and regulations thereunder, and the declaration or ordering of the
effectiveness of such registration statement by the Commission.

                                       2


          (s) "Registration Expenses" shall mean all expenses incurred by Neon
in effecting any registration pursuant to this Agreement, including all
registration, qualification and filing fees, reproduction and printing expenses,
expenses incurred by Neon in the preparation of any registration statement, fees
and disbursements of counsel for Neon and those of Neon's other independent
professional advisors and experts, listing fees and other costs incurred in
listing Registrable Securities for trading on Nasdaq or on any stock exchange,
blue sky fees and expenses (if any), expenses of any regular or special
accounting services provided to Neon or required by any such registration, and
the reasonable fees and disbursements of one counsel selected by Exelon, but
shall not include Selling Expenses.

          (t) "Registration Statement" shall mean any registration statement to
be filed or filed by Neon with the Commission pursuant to Section 2, below
(including (a) all amendments and supplements thereto, (b) each Prospectus
contained therein, and (c) all exhibits thereto or incorporated by reference
therein).

          (u) "Rule 144" shall mean Rule 144 as promulgated by the Commission
under the Securities Act, as such rule may be amended from time to time, or any
similar successor rule that may be promulgated by the commission.

          (v) "Securities Act" shall mean the Securities Act of 1933, as
amended, and regulations thereunder, all as the same shall be in effect from
time to time.

          (w) "Seller" shall mean Exelon, each Permitted Transferee, and any
other holder of Registrable Securities to whom the registration rights conferred
by this Agreement have been transferred in compliance with Section 11(a) hereof,
in each case who are offering for resale Registrable Securities on a
Registration Statement.

          (x) "Selling Expenses" shall mean all brokerage fees, selling
commissions and underwriting discounts (if any), and stock transfer taxes
applicable to the sale of Registrable Securities and fees and disbursements of
counsel for any Seller (other than the fees and disbursements of such counsel
included in Registration Expenses).

          (y) "Transfer" shall mean any sale, transfer, encumbrance, gift,
donation, assignment, pledge, hypothecation or other disposition of any Common
Stock or any interest therein, whether voluntary or involuntary, including, but
not limited to, any disposition by operation of law, by court order, by judicial
process or by foreclosure, levy or attachment.

     2. Registration.

          (a) Initial Registration. As soon as practicable after the Closing,
Neon shall use its best efforts to effect the registration for offer and sale
under the Securities Act of all of the Exelon Shares. In furtherance thereof,
Neon shall file with the Commission within forty-five (45) days of Closing a
registration statement on an appropriate form (which form shall comply as to
form in all material respects with the requirements of the applicable form)
under the Securities Act covering the Exelon Shares and that number of
additional shares of Common Stock which represent interest payments that would
become due on the Exelon Note through August 15, 2004 if such interest payments
were to be paid in the form of additional shares of Common Stock or additional
convertible notes in accordance with the terms of the Exelon Note.

                                       3



          (b) Additional Registration. Neon shall file an additional
registration statement no later than January 15, 2005, to the extent necessary
to register the offer and sale under the Securities Act of that number of
additional shares of Common Stock which represent interest payments that would
become due under the Exelon Note through its maturity date if such interest
payments were to be paid in the form of additional shares of Common Stock or
additional convertible notes in accordance with the terms of the Exelon Note.

     3. Registration Expenses. All Registration Expenses shall be borne by Neon.

     4. Registration Procedures. If and whenever Neon is required by the
provisions of this Agreement to use its best efforts to effect the registration
of any Registrable Securities under the Securities Act, Neon shall, at Neon's
expense:

          (a) notify each Seller as to: (i) the initial filing of the
Registration Statement; (ii) the receipt of any comments thereon from the
Commission; (iii) any request from the Commission or any state regulatory
authority for amendment of the Registration Statement or for supplement to any
Prospectus or for any additional information in connection therewith; (iv) the
filing of each amendment thereto, including any post-effective amendment; (v)
the effectiveness of the Registration Statement or any post-effective amendment
thereto; and (vi) the issuance by the Commission or any state regulatory
authority of any stop order suspending the effectiveness of the Registration
Statement or the use of any Prospectus or the institution of any proceedings for
that purpose;

          (b) use its best efforts to prevent the issuance of any stop order
preventing or suspending the use of any Prospectus and to obtain as soon as
possible the lifting or withdrawal thereof, if issued;

          (c) keep the Registration Statement effective from the effective date
thereof to and including the first to occur: (i) ninety-six (96) months from the
Closing Date; (ii) the date on which all Sellers have completed the distribution
of Registrable Securities described in the Registration Statement; or (iii) the
date on which all of the Registrable Securities held by the Sellers shall be
eligible to be sold pursuant to Rule 144(k) (or any similar successor
provision);

          (d) promptly prepare and file with the Commission such amendments and
supplements to the Registration Statement and the prospectus used in connection
with the Registration Statement as shall be necessary to comply with the
provisions of the Securities Act with respect to the disposition of all
securities covered by the Registration Statement and thereafter use its
reasonable best efforts to cause any such post-effective amendment to be
declared effective by the Commission as promptly as permitted by the Commission;

          (e) furnish to each Seller: (i) such number of Prospectuses and other
documents incident thereto, including any amendment of or supplement to the
Prospectus, as such Seller may reasonably request (for dissemination or
otherwise) from time to time; (ii) two signed copies of the Registration
Statement and all amendments thereto, including all exhibits filed therewith;
and (iii) such number of conformed copies of the Registration Statement
(including such number of copies of the exhibits filed therewith as may
reasonably be requested), including documents incorporated by reference therein,
as such Seller may reasonably request from time to time;

                                       4


          (f) notify each Seller of Registrable Securities covered by the
Registration Statement at any time:

               (i) when a Prospectus relating thereto is required to be
delivered under the Securities Act of the happening of any event or the failure
of any event to occur or the discovery of any facts as a result of which the
Prospectus included in the Registration Statement, as then in effect, includes
any untrue statement of a material fact or omits to state a material fact
required to be stated therein or necessary to make the statements therein not
misleading or incomplete in the light of the circumstances then existing, and at
the request of a Seller, prepare and furnish to such Seller, a reasonable number
of copies of a supplement to or an amendment of such Prospectus as may be
necessary so that, as thereafter delivered to the purchaser(s) of such shares,
such Prospectus shall not include any untrue statement of a material fact or
omit to state a material fact required to be stated therein or necessary to make
the statements therein not misleading or incomplete in the light of the
circumstances then existing;

               (ii) if, during the Applicable Period, the representations and
warranties of Neon contained in this Agreement or in the Exelon Purchase
Agreement, as the case may be, cease to be true and correct in any material
respect;

               (iii) if Neon receives any notification of the issuance of a stop
order or the suspension of the registration or qualification of the Registrable
Securities in any jurisdiction or the initiation of any proceeding for such
purpose; and

               (iv) that, in Neon's reasonable determination, a post-effective
amendment to the Registration Statement would be appropriate;

          (g) use its best efforts to register or qualify the Registrable
Securities covered by the Registration Statement under the securities or Blue
Sky laws of such states as the Seller shall reasonably request, and do any and
all other acts and things that may be necessary or desirable to enable the
Seller to consummate the public sale or other disposition in such states of the
Registrable Securities owned by such Seller; provided, however, that Neon shall
not be required in connection with this paragraph (g) to qualify as a foreign
corporation or execute a general consent to service of process in any
jurisdiction;

          (h) use its best efforts to list the Registrable Securities registered
pursuant to this Agreement on Nasdaq and any securities exchange on which shares
of the Common Stock are then listed;

          (i) make generally available to its security holders, as soon as
reasonably practicable, an earnings statement covering the period of at least
twelve (12) months, but not more than eighteen (18) months, beginning with the
first month after the effective date of the Registration Statement, which
earnings statement shall satisfy the provisions of Section 11(a) of the
Securities Act and Rule 158 thereunder (or any similar rule promulgated under
the Securities Act); and

          (j) Neon shall provide one copy of each notice or document given or
furnished to each Seller pursuant to Section 4(a) (e) and (f) above,
concurrently with the provision thereof to each Seller and/or as promptly

                                       5



thereafter as possible, to legal counsel designated by each Seller in a written
notice given to Neon.

     5. Information by Each Seller.

          (a) Each Seller shall furnish to Neon such information regarding such
Seller, the Registrable Securities held by such Seller and the sale or other
Transfer thereof proposed by such Seller as Neon may request in writing and as
shall be reasonably required in connection with the Registration.

          (b) Each Seller shall furnish to Neon such certificates and documents
confirming as of the effective date of the Registration Statement the
representations and warranties and performance of the covenants made herein by
such Seller.

     6. Representation and Warranties of Neon. Neon represents and warrants to
each Seller as of the date hereof follows:

          (a) Neon complies with the conditions for the use of Form S-3 under
the Securities Act in connection with the resale of securities on behalf of a
selling stockholder.

          (b) The Registration Statement will contain, and the Prospectus and
any amendments or supplements thereto will contain, all statements which are
required to be stated therein by, and will conform to, the requirements of the
Securities Act. The documents incorporated by reference in the Prospectus, at
the time filed with the Commission, conformed in all material respects to the
then applicable requirements of the Exchange Act or the Securities Act. The
Registration Statement will not contain any untrue statement of a material fact
and will not omit to state any material fact required to be stated therein or
necessary to make the statements therein not misleading. The prospectus and any
amendments and supplements thereto will not contain as of the date of such
Prospectus, any untrue statement of material fact; and will not omit as of the
date of such Prospectus, to state any material fact required to be stated
therein or necessary to make the statements therein, in the light of the
circumstances under which they were made, not misleading; provided, however,
that Neon makes no representations or warranties as to information contained in
or omitted from the Registration Statement or the Prospectus, in reliance upon,
and in conformity with, written information furnished to Neon by or on behalf of
Exelon, any predecessor of Exelon or any other Seller, specifically for use in
the preparation thereof or in any report or other document incorporated therein
by reference, including, without limitation, any Current Report on Form 8-K
under the Exchange Act which Neon may file in connection with the transactions
contemplated by the Exelon Purchase Agreement.

          (c) The consolidated financial statements of Neon and its
subsidiaries, together with related notes and schedules as set forth or
incorporated by reference in the Registration Statement, present fairly the
financial position and the results of operations and cash flows of Neon and the
consolidated subsidiaries, at the indicated dates and for the indicated periods.
Such financial statements and related schedules have been prepared in accordance
with generally accepted principles of accounting, consistently applied
throughout the periods involved, and all adjustments necessary for a fair
presentation of results for such periods have been made.

                                       6



          (d) No approval, consent, order, authorization, designation, or filing
by or with any regulatory, administrative or other governmental body is
necessary to be made by or on behalf of Neon in connection with the execution
and delivery by Neon of this Agreement and the consummation of the transactions
herein contemplated except (i) as required under the Securities Act or the
Exchange Act; (ii) in connection with the listing of the Registrable Securities
on Nasdaq; or (iii) as may be necessary to qualify the Registrable Securities
for public offering under state securities or Blue Sky laws.

     7. Representation and Warranties of Each Seller. Each Seller, severally and
not jointly, represents and warrants the following:

          (a) Each Seller, has, and each Seller will, upon the effectiveness of
the Registration Statement and at the time of any sale or other Transfer
thereunder, have good and marketable title to the Registrable Securities held by
it which it seeks to sell pursuant to the Registration Statement, free and clear
of any liens, encumbrances and claims, at law or in equity, and full right,
power and authority to effect the sale and delivery of such Registrable
Securities.

          (b) No Seller has taken, directly or indirectly, any action designed
to, or which has constituted, or which might reasonably be expected to cause or
result in the manipulation or stabilization of the price of the Common Stock
and, other than as permitted by the Securities Act, no Seller will distribute
any Prospectus (as defined in the Securities Act) or other offering material in
connection with the offering of the Registrable Securities.

     8. Covenants of Each Seller. Each Seller, severally and not jointly
covenants and agrees as follows:

          (a) No Seller shall make or effect any Transfer, directly or,
indirectly, of any Registrable Securities, owned of record or beneficially by
it, (i) prior to the effectiveness of the Registration Statement, or (ii)
thereafter, except as permitted by and in accordance with the respective terms
and conditions of this Agreement (including Section 6 (b), below) and the other
Closing Documents.

          (b) Subsequent to the effectiveness of the Registration Statement, no
Seller shall make or effect any Transfer of Registrable Securities except: (i)
Permitted Transfers; (ii) Transfers pursuant to the Prospectus and as provided
under the caption "Plan of Distribution" therein; and (iii) Transfers in
accordance with Rule 144(k); provided, however, that if, for any reason, the
Registration Statement shall not have become effective prior to the first
anniversary of Closing, Transfers of Registrable Securities may be effected in
accordance with Rule 144; and provided, further, however, that if the
Registration Statement shall become effective but the Prospectus shall
thereafter become unusable to effect sales of Registrable Securities during the
Applicable Period due to the entry of a stop order, the filing of a
post-effective amendment which has not been declared effective or for any other
reason, then Transfers of Registrable Securities may be effected pursuant to the
provisions of Rule 144.

          (c) Each Seller shall promptly notify Neon of each Transfer (other
than Transfers effected pursuant to the Prospectus or Rule 144) of Registrable
Securities made or effected by it, but in no event later than five (5) Business
Days after such Transfer. Each such Seller shall specify the name, address and

                                       7



tax identification number of each transferee, together with the amount of
Registrable Securities transferred to such transferee.

          (d) Each such Seller shall promptly notify Neon if it shall have
become an "affiliate" of Neon within the meaning of Rule 144(a).

          (e) No Seller will take, directly or indirectly, any action designed
to cause or result in, or which might reasonably be expected to constitute, the
manipulation or stabilization of the price of Common Stock or of any other
securities of Neon. Each Seller will endeavor in good faith to maintain an
orderly market when distributing the Registrable Securities.

          (f) The information pertaining to each Seller provided or which will
be provided to Neon by or on behalf of each Seller for inclusion under the
caption "Selling Stockholders" in each Prospectus will be complete and accurate
in all material respects as of the date of such Prospectus.

     9. Indemnification With Respect to Securities Matters.

          (a) Neon will indemnify each Seller, each of their respective
officers, directors and partners, agents, representatives, legal counsel, and
accountants and each Person controlling each such Seller within the meaning of
Section 15 of the Securities Act with respect to which Registration has been
effected pursuant to this Section 9 against all expenses, claims, losses,
damages, and liabilities (or actions, proceedings, or settlements in respect
thereof) arising out of or based on any untrue statement (or alleged untrue
statement) of a material fact contained in any Prospectus, offering circular, or
other document (including any related Registration Statement) incident to any
such Registration, or based on any omission (or alleged omission) to state
therein a material fact required to be stated therein or necessary to make the
statement therein not misleading, or any violation by Neon of the Securities Act
or any rule or regulation thereunder applicable to Neon and relating to action
or inaction required of Neon in connection with any such Registration, and will
reimburse any such Seller, its respective officers, directors, partners, agents,
representatives, legal counsel, and accountants and each person controlling such
Seller for any legal and any other expenses reasonably incurred in connection
with investigating and defending or settling any such claim, loss, damage,
liability, or action; provided, however, that Neon will not be liable in any
such case to the extent that any such claim, loss, damage, liability, or expense
arises out of or is based on any untrue statement or omission based upon written
information furnished to Neon by any Seller and stated to be specifically for
use therein; provided, further, that Neon will not be liable in any case to the
extent such claim, loss, damage, liability or action arises out of the
Indemnified Party's (as defined below) failure to send or give a copy of the
final Prospectus, as the same may be then supplemented or amended, to the Person
asserting an untrue statement or alleged untrue statement or omission or alleged
omission at or prior to the written confirmation of the sale of Registrable
Securities to such Person if such statement or omission was corrected in such
final Prospectus so long as such final Prospectus, and any amendments or
supplements thereto, have been furnished to such Indemnified Party. It is agreed
that the indemnity agreement contained in this Section 9 shall not apply to
amounts paid in settlement of any such loss, claim, damage, liability, or action
if such settlement is effected without the consent of Neon (which consent shall
not be unreasonably withheld).

                                       8


          (b) Each Seller will indemnify Neon, each of its directors, officers,
partners, agents, representatives, legal counsel, and accountants and each
Person who controls Neon within the meaning of Section 15 of the Securities Act,
against all claims, losses, damages and liabilities (or actions in respect
thereof) arising out of or based on any untrue statement (or alleged untrue
statement) of a material fact contained in the Registration Statement,
Prospectus, offering circular, or other document, or any omission (or alleged
omission) to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, and will reimburse
Neon, directors, officers, partners, agents, representatives, legal counsel, and
accountants and control persons for any legal or any other expenses reasonably
incurred in connection with investigating or defending any such claim, loss,
damage, liability, or action, in each case to the extent, but only to the
extent, that such untrue statement (or alleged untrue statement) or omission (or
alleged omission) is made in such Registration Statement, Prospectus, offering
circular, or the document in reliance upon and in conformity with written
information furnished to Neon by such Seller or authorized by such Seller to be
furnished to Neon on behalf of such Seller, and stated to be specifically for
use therein; provided, however, that the obligations of each Seller hereunder
shall not apply to amounts paid in settlement of any such claims, losses,
damages, or liabilities (or actions in respect thereof) if such settlement is
effected without the consent of such Seller (which consent shall not be
unreasonably withheld). The maximum liability of any Seller for indemnity
pursuant to this Section 9(b) shall not exceed the net proceeds that such Seller
realized from the sale of its Registrable Securities pursuant to the Prospectus
or, if such Seller has not yet sold any Registrable Securities pursuant to the
Prospectus at the time that indemnification is required pursuant to this
Agreement then such Seller's maximum liability hereunder shall be the value of
the Common Stock beneficially held by such Seller covered by the Prospectus
measured by the closing price of such Common Stock on Nasdaq or other market or
exchange on which the Common Stock are traded, or, if not so traded, by a fair
market value standard reasonably approved by Neon's then current Board of
Directors.

          (c) Each Person entitled to indemnification under this Section 9 (the
"Indemnified Party") shall give notice to the Person required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has actual knowledge of any claim as to which indemnity may be sought, and shall
permit the Indemnifying Party to assume the defense of such claim or any
litigation resulting therefrom, provided that counsel for the Indemnifying
Party, who shall conduct the defense of such claim or any litigation resulting
therefrom, shall be approved by the Indemnified Party (whose approval shall not
unreasonably be withheld), and the Indemnified Party may participate in such
defense at such Indemnified Party's expense, and provided further that the
failure of any Indemnified Party to give notice as provided herein shall not
relieve the Indemnifying Party of its obligations under this Agreement to the
extent such failure is not prejudicial. No Indemnifying Party, in the defense of
any such claim or litigation, shall, except with the consent of each Indemnified
Party, consent to entry of any, judgment or enter into any settlement that does
not include as an unconditional term thereof the giving by the claimant or
plaintiff to such Indemnified Party of a release from all liability in respect
to such claim or litigation. Each Indemnified Party shall furnish such
information regarding itself or the claim in question as an Indemnifying Party
may reasonably request in writing and as shall be reasonably required in
connection with defense of such claim and litigation resulting therefrom.

                                       9



          (d) If the indemnification provided for in this Section 9 is
unavailable to or insufficient to hold harmless an Indemnified Party with
respect to any loss, liability, claim, damage, or expense, (or actions or
proceedings in respect thereof) referred to therein, then the Indemnifying
Party, in lieu of indemnifying such Indemnified Party hereunder, shall
contribute to the amount paid or payable by such Indemnified Party as a result
of such loss, liability, claim, damage, or expense (or actions or proceedings in
respect thereof) in such proportion as is appropriate to reflect the relative
fault of the Indemnifying Party, on the one hand, and of the Indemnified Party
on the other, in connection with the statement or omissions that resulted in
such loss, liability, claim, damage, or expense (or actions or proceedings in
respect thereof), as well as any other relevant equitable considerations;
provided, however, that no Person guilty of fraudulent misrepresentation (within
the meaning of Section 11(f) of the Securities Act) shall be entitled to
contributions from any Person that was not guilty of such fraudulent
misrepresentation. The relative fault of the Indemnifying Party and of the
Indemnified Party shall be determined by reference to, among other things,
whether the untrue or alleged untrue statement of a material fact or the
omission or alleged omission to state a material fact relates to information
supplied by the Indemnifying Party or by the Indemnified Party and the parties'
relative intent, knowledge, access to information, and opportunity to correct or
prevent such statement or omission.

     The parties hereto agree that it would not be just and equitable if
contributions pursuant to this Section 9(d) were determined by pro rata
allocation or by any other method of allocation which does not take account of
the equitable considerations referred to above in this Section 9 (d). The amount
paid or payable by an Indemnified Party as a result of any loss, liability,
claim, damage, or expense (or actions or proceedings in respect thereof)
referred to above in this Section 9(d) shall be deemed to include any legal or
other expenses reasonably incurred by such Indemnified Party in connection with
investigating or defending any such action or claim.

          (e) The obligations of each Seller to indemnify and hold harmless Neon
and each other person entitled to indemnity as an Indemnified Party under
Section 9(b), above, is independent of any provision of the Exelon Purchase
Agreement and the right of Neon and each such other Person to be indemnified
under Section 9(b) shall not be limited by or otherwise subject to any provision
of the Exelon Purchase Agreement. Specifically, by way of example, and not by
way of limitation, such claims shall not be subject to any minimum amount and
such claims may not be asserted against or offset by any portion of the Exelon
Note.

     10. Reporting Requirements. Neon agrees that:

          (a) during the Applicable Period, for so long as Neon is subject to
the reporting requirements of Section 13 or 15 of the Exchange Act, Neon will
file the reports required to be filed by it under the Securities Act and Section
13(a) or 15(d) of the Exchange Act and the rules and regulations adopted by the
Commission thereunder;

          (b) if Neon shall cease to be so required to file such reports, it
will, upon the request of any Seller with Registrable Securities covered under a
Registration Statement, take such further action that is reasonable in the
circumstances, including, without limitation, the provision of current public
information as required by Rule 144(c) (or any similar successor provision), to
enable such Seller to sell its Registrable Securities pursuant to Rule 144; and

                                       10


          (c) periodically furnish to each Seller with Registrable Securities
covered under a Registration Statement forthwith upon written request a written
statement by Neon as to its compliance with the reporting requirements of the
Securities Act, the Exchange Act and/or Rule 144, as appropriate.

     11. Miscellaneous.

          (a) Benefits Non-transferable. Notwithstanding anything to the
contrary contained elsewhere in this Agreement or in any other Closing Document,
the obligation of Neon to effect the Registration and, thereafter, to maintain
the effectiveness of the Registration Statement is solely for the benefit of
Exelon and, subject to Section 1(m), its Permitted Transferees.

          (b) Governing Law. This Agreement shall be governed by and interpreted
and enforced in accordance with the laws of the State of Delaware as applied to
contracts made and fully performed therein.

          (c) Section Headings. All section headings are for convenience only
and shall in no way modify or restrict any of the terms or provisions hereof.

          (d) Interpretation. The masculine (or neuter) pronoun and the singular
number shall include the masculine, feminine and neuter genders and the singular
and plural numbers. All references in the singular or plural shall be deemed to
have been made, respectively, in the plural or singular number as well, as the
context may require.

          (e) Counterparts. This Agreement may be executed in two or more
counterparts, including, without limitation, execution by facsimile, each of
which shall be deemed an original, and all of which when taken together shall be
deemed to be one and the same instrument. It shall not be necessary in making
proof of this Agreement or any counterpart hereof to produce or account for any
of the other counterparts.

          (f) Amendments and Waivers. The provisions of this Agreement,
including provisions of this Section 11(f), may not be amended, modified or
supplemented, otherwise than with the prior written consent of Neon and Exelon.

          (g) Notices. All notices and other communications provided for or
permitted hereunder shall be made in writing by hand delivery, registered first
class mail, telex, telecopier, or any courier guaranteeing overnight delivery:
(i) if to Exelon addressed as follows: Robert Shinn, Vice President Exelon
Enterprises Management, Inc., 2301 Market Street, Philadelphia, Pennsylvania
19101, and (ii) if to Neon, addressed to Neon's address as set forth in the
Exelon Purchase Agreement and thereafter at such other address, notice of which
is given in accordance with the provisions of this Section 11(g).

     All such notices and communications shall be deemed to have been duly given
at the time delivered by hand, if personally delivered; five Business Days after
being deposited in the mail, postage prepaid, if mailed; when answered back, if
telexed; when receipt is acknowledged, if telecopied; and on the next Business
Day, if timely delivered to an air courier guaranteeing overnight delivery.

                                       11


          (h) Successors and Assigns. This Agreement shall inure to the benefit
of and be binding upon the successors, assigns and transferees of the parties
hereto, subject to Section 11(a), above, provided, however, that nothing herein
shall be deemed to permit any assignment, transfer or other disposition of
Registrable Securities in violation of the terms of this Agreement, the Exelon
Purchase Agreement or applicable law. If any transferee of any Seller shall
acquire Registrable Securities, in any manner, whether by operation of law or
otherwise, such Registrable Securities shall be held subject to all of the terms
of this Agreement, and by taking and holding such Registrable Securities, such
Person shall be conclusively deemed to have agreed to be bound by and to perform
all of the terms and provisions of this Agreement and such Person shall be
entitled to receive the benefits hereof.

                  [REMAINDER OF PAGE LEFT INTENTIONALLY BLANK]




                                       12


     IN WITNESS WHEREOF, the parties hereto, intending to be legally bound
hereby, have duly executed this Registration Rights Agreement on the date first
above written.


Attest:                                          NEON COMMUNICATIONS, INC.


  /s/ Barbara Johnson                               /s/ Stephen E. Courter
-------------------------------                  -------------------------------
Title:  Assistant Secretary                      Name:  Stephen E. Courter
                                                 Title:  Chief Executive Officer




Attest:                                          EXELON ENTERPRISES
                                                 MANAGEMENT, INC.


     /s/ John D. Halderman                       BY:  /s/ Robert A. Shinn
-------------------------------                  -------------------------------
Title:  Secretary                                Name:  Robert A. Shinn
                                                 Title:  President






                                                                       Exhibit A


                               ADOPTION AGREEMENT
                               ------------------


     This Adoption Agreement ("Adoption Agreement") is executed by the
undersigned (the "Transferee") pursuant to the terms of that certain
Registration Rights Agreement dated as of August 10, 2001 (the "Agreement") by
and between Neon Communications, Inc. and Exelon Enterprises Management, Inc.
Capitalized terms used but not defined herein shall have the respective meanings
ascribed to such terms in the Agreement. By the execution of this Adoption
Agreement, the Transferee agrees as follows:

     1. Acknowledgment. Transferee acknowledges that Transferee is acquiring
certain securities of the Company (the "Securities"), subject to the terms and
conditions of the Agreement.

     2. Agreement. Transferee (i) agrees that the Securities acquired by
Transferee shall be bound by and subject to the terms of the Agreement, and (ii)
hereby adopts the Agreement with the same force and effect as if Transferee were
originally a party thereto, with the effect that Transferee shall hereafter be
deemed a "Seller" for the purposes of the Agreement.

     3. Notice. Any notice required or permitted by the Agreement shall be given
to Transferee at the address listed beside Transferee's signature below.

         EXECUTED AND DATED as of this ____ day of __________________.


                              [NAME OF TRANSFEREE]



                              By:
                                 -----------------------------------------------
                              Name:
                                    --------------------------------------------
                              Title:
                                    --------------------------------------------


                              Social Security Number or Tax ID Number:
                                                                      ----------
                              Address:
                                      ------------------------------------------
                              Fax:
                                  ----------------------------------------------


                                                                       EXHIBIT E

                   AMENDMENT NO. 1 TO STOCKHOLDERS' AGREEMENT

          This AMENDMENT NO. 1 TO STOCKHOLDERS' AGREEMENT, dated August 10, 2001
(the "Amendment No. 1"), is entered into by and among Mode 1 Communications,
Inc. ("M1"), Exelon Enterprises Management, Inc., formerly known as Exelon
Ventures Corp. ("Exelon"), Consolidated Edison Communications, Inc. ("CEC") and
NEON Communications, Inc. (the "Company"). M1, Exelon, and CEC are referred to
in this Amendment No. 1 collectively as the "Stockholders."

          WHEREAS, the Stockholders and the Company entered into a Stockholders'
Agreement dated as of September 14, 2000 (the "Stockholders' Agreement")
pursuant to which the Stockholders agreed, among other things, to establish
reciprocal rights of first offer; and

          WHEREAS, the parties mutually desire to amend the Stockholders'
Agreement to release M1, CEC and Exelon from the mutual rights and obligations
provided for in Section 8 of the Stockholders' Agreement;

          NOW, THEREFORE, in consideration of the foregoing, the Stockholders
and the Company agree as follows:

          1. Deletion of Section 8 of the Stockholders' Agreement. Section 8 of
the Stockholders' Agreement is hereby deleted in its entirety.

          2. Full Force and Effect. Except for the amendment described herein,
the Stockholders' Agreement shall remain in full force and effect.

          3. Successors and Assigns. This Amendment No. 1 shall inure to the
benefit of and be binding upon the successors and permitted assigns of each of
the parties hereto.

          4. Counterparts. This Amendment No. 1 may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

          5. GOVERNING LAW. THIS AMENDMENT NO. 1 SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE, WITHOUT REGARD
TO THE PRINCIPLES OF CONFLICTS OF LAW OF ANY JURISDICTION.




          IN WITNESS WHEREOF, the undersigned have executed, or have caused to
be executed, this Amendment No. 1 on the date first written above.


                                    MODE 1 COMMUNICATIONS, INC.

                                    By: /s/ John H. Forsgren
                                        ----------------------------------------
                                        Name:  John H. Forsgren
                                        Title:  Executive Vice President and
                                                Chief Financial Officer of
                                                Northeast Utilities Service
                                                Company as Agent for Mode 1
                                                Communications, Inc.


                                    EXELON ENTERPRISES MANAGEMENT, INC.

                                    By: /s/ Robert A. Shinn
                                        ----------------------------------------
                                        Name: Robert A. Shinn
                                        Title:  President


                                    CONSOLIDATED EDISON COMMUNICATIONS, INC.

                                    By: /s/ Peter Rust
                                        ----------------------------------------
                                        Name:  Peter Rust
                                        Title: President and Chief Executive
                                               Officer


                                    NEON COMMUNICATIONS, INC.

                                    By: /s/ Stephen E. Courter
                                        ----------------------------------------
                                        Name:  Stephen E. Courter
                                        Title:  Chief Executive Officer


                        SIGNATURE PAGE TO AMENDMENT NO. 1
                           TO STOCKHOLDERS' AGREEMENT