NEON COMMUNICATIONS INC
SC 13D, 2000-09-25
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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                       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
                              ---------------------

                            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 215-575-7000
-------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                               September 14, 2000
-------------------------------------------------------------------------------
             (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).

<PAGE>


Schedule 13D                            Forms

CUSIP No. 640  506  10 1

------------- -----------------------------------------------------------------
1             NAMES OF REPORTING PERSONS
              I.R.S. IDENTIFICATIN NO. OF ABOVE PERSONS (ENTITIES ONLY)
              Exelon Ventures Corp.      EIN: 23-7866286
------------- -----------------------------------------------------------------
2             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*   (a)   [ ]
                                                                  (b)   [X]

------------- -----------------------------------------------------------------
3             SEC USE ONLY

------------- -----------------------------------------------------------------
4             SOURCE OF FUNDS*
              OO, WC
------------- -----------------------------------------------------------------
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
REPORTING PERSON WITH
----------------------------- ------------ ------------------------------------
                              8            SHARED VOTING POWER
                                             9,381,916
----------------------------- ------------ ------------------------------------
                              9            SOLE DISPOSITIVE POWER
                                            2,131,143
----------------------------- ------------ ------------------------------------
                              10           SHARED DISPOSITIVE POWER
                                           None
-------------- ----------------------------------------------------------------
11             AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                9,381,9161
-------------- ----------------------------------------------------------------
12             CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
               CERTAIN SHARES*

-------------- ----------------------------------------------------------------
13             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
               56.3 %
-------------- ----------------------------------------------------------------
14             TYPE OF REPORTING PERSON*
                CO
-------------- ----------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

1    Includes  7,250,773 shares  beneficially  held by others who, together with
     Exelon Ventures Corp., may be held to constitute a group.

<PAGE>


Schedule 13D                        Forms

CUSIP No. 640  506  10 1

------------- -----------------------------------------------------------------
1             NAMES OF REPORTING PERSONS
              I.R.S. IDENTIFICATIN NO. OF ABOVE PERSONS (ENTITIES ONLY)
              PECO Energy Company      EIN: 23-0970240
------------- -----------------------------------------------------------------
2             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*   (a)   [ ]
                                                                  (b)   [X]

------------- -----------------------------------------------------------------
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
                9,381,9162
-------------- ----------------------------------------------------------------
12             CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
               CERTAIN SHARES*

-------------- ----------------------------------------------------------------
13             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
               56.3 %
-------------- ----------------------------------------------------------------
14             TYPE OF REPORTING PERSON*
                CO, HC
-------------- ----------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


2    Includes  7,250,773 shares  beneficially  held by others who may be held to
     constitute a group of which subsidiary is a member.


<PAGE>



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.
PECO Energy Company, a Pennsylvania corporation, owns all of the issued and
         outstanding stock of Exelon Ventures Corp.
(a) Name of Filing Person:
     PECO Energy Company
(b) Residence or Business Address:
      2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
      Provider of power generation and other services.

Directors of PECO Energy Company:
(a) Name:
     Corbin A. McNeil, Jr.
(b) Residence or Business Address:
     2301 Market Street, S26-1, Philadelphia, PA 19103
(c) Present Principal Occupation:
     Chairman, President and Chief Executive Officer of PECO Energy Company.

(a) Name:
     Susan W. Catherwood
(b) Residence or Business Address:
      2301 Market Street, Philadelphia PA 19103
(c) Present Principal Occupation:
     Former chairman of the Trustee Board,
     University of Pennsylvania Medical Center and Health System.


<PAGE>

(a) Name:
      Daniel L. Cooper
(b) Residence or Business Address:
       2301 Market Street, Philadelphia PA 19103
(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:
      2301 Market Street,  Philadelphia, PA 19103
(c) Present Prinicipal Occupation:
     Chairman, President and Chief Executive Officer
     Legg Mason Real Estate Services.

(a) Name:
     G. Fred DiBona, Jr.
(b) Residence or Business Address:
     2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
      President and Chief Executive Officer, Independence Blue Cross.

(a) Name:
     R. Keith Elliott
(b) Residence or Business Address:
      2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
      Chairman and Chief Executive Officer, Hercules Incorporated.

(a) Name:
      Richard H. Glanton, ESQ.
(b) Residence or Business Address:
      2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
      Partner of the law firm Reed Smith Shaw & McClay, LLP.


<PAGE>

(a) Name:
     Rosemarie B. Greco
(b) Residence or Business Address:
      2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
     Principal, GRECO Ventures.

(a) Name:
     Dr. John M. Palms
(b) Residence or Business Address:
      2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
      Office of the President of the University of South Carolina.

(a) Name:
      Joseph F. Paquette, Jr.
(b) Residence or Business Address:
      2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
      Former President, Chief Executive Officer and Chief Operating
      Officer of PECO Energy Company.

(a) Name:
     Ronald Rubin
(b) Residence or Business Address:
       2301 Market Street, Philadelphia, PA 19103.
(c) Present Principal Occupation:
     Chief Executive Officer, The  Pennsylvania Real Estate Investment Trust.

(a) Name:
     Robert Subin
(b) Residence or Business Address:
       2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
      Former Senior Vice-President Global Sourcing and Engineering,
      Campbell Soup Company.

Officers of PECO Energy Company:
(a) Name:
     Corbin A. McNeil, Jr.
(b) Residence or Business Address:
     2301 Market Street, S26-1, Philadelphia, PA 19103
(c) Present Principal Occupation:
     Chairman, President and Chief Executive Officer.


<PAGE>

(a) Name:
     Michael J. Egan
(b) Residence or Business Address:
     2301 Market Street, S26-1, Philadelphia, PA 19103
(c) Present Principal Occupation:
     Senior Vice-President Finance and Chief Financial Officer.

(a) Name:
     Gerald R. Rainey
(b) Residence or Business Address:
       2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
      President and Chief Nuclear Officer, PECO Energy Nuclear.

(a) Name:
     James W. Durham
(b) Residence or Business Address:
     2301 Market Street, S26-1, Philadelphia, PA 19103
(c) Present Principal Occupation:
     Senior Vice-President and General Counsel.

(a) Name:
     Kenneth G. Lawrence
(b) Residence or Business Address:
     2301 Market Street, S24-1, Philadelphia, PA 19103
(c) Present Principal Occupation:
     Senior Vice-President, Corporate and President, PECO Energy Distribution.

(d) , (e) Neither PECO Energy  Company nor, to the best knowledge of PECO Energy
Company, has any director or officer of PECO Energy Company, 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:
PECO  Energy  Company  is  organized  under  the  laws  of the  Commonwealth  of
Pennsylvania.
Each of PECO Energy Company's  Officers and Directors are citizens of the United
States of America.


<PAGE>

(a) Name of Person Filing:
     Exelon Ventures Corp., a Pennsylvania corporation, is a wholly-owned
     subsidiary of PECO Energy Company.
(b) Residence or Business Address:
      2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
      Owns and manages capital investments.

Directors of Exelon Ventures Corp:
(a) Name:
     Gregory A. Cucchi
(b) Residence or Business Address:
      2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
     Chairman, Chief Executive Officer, Exelon Ventures  Corp.

(a) Name:
     Robert A. Shinn
(b) Residence or Business Address:
      2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
     President, Exelon Ventures Corp.

(a) Name:
      Michael J. Eagan
(b) Residence or Business Address:
     2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
     Senior Vice-President Finance and Chief Financial Officer
     of PECO Energy Company.

Officers of Exelon Corp:
(a) Name:
      Gregory A. Cucchi
(b) Residence or Business Address:
     2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
      Chairman, Chief Executive Officer.


<PAGE>

(a) Name:
      Joseph J. Kerecman
(b) Residence or Business Address:
     2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
      Vice-President

(a) Name:
     Katherine K. Combs
(b) Residence or Business Address:
      2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
     Secretary

(a) Name:
      Robert A. Shinn
(b) Residence or Business Address:
      2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
     President

(a) Name:
     J. Barry Mitchell
(b) Residence or Business Address:
      2301 Market Street, Philadelphia, PA 19103
(c) Present Principal Occupation:
     Treasurer

(d), (e) Neither  Exelon  Ventures  Corp.  nor, to the best  knowledge of Exelon
Ventures  Corp.,  has any  director or officer of Exelon  Ventures  Corp.,  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  Ventures  Corp.  is  organized  under  the laws of the  Commonwealth  of
Pennsylvania.
Each of Exelon  Ventures  Corp.'s  Officers  and  Directors  are citizens of the
United States of America.

<PAGE>

Item 3.  Source and Amount of Funds or Other Consideration.

Pursuant  to the  terms of a  Subscription  Agreement  between  Northeast  Optic
Network,  Inc., NEON  Communications,  Inc. ("NEON  Communications")  and Exelon
Corporation (now known as Exelon Ventures Corp.), dated as of November 23, 1999,
as amended by Amendment  No. 1 dated May 1, 2000 among the parties and Amendment
No. 2 dated September 6, 2000 among the parties (as amended,  the  "Subscription
Agreement"),  executed in connection with the  transaction  described in Item 4,
below, NEON Communications issued 2,131,143 shares of its common stock to Exelon
Ventures  Corp.  in exchange for certain  intangible  rights of use and services
related  thereto to be  provided  by Exelon  Ventures  Corp.  and  certain  cash
payments made or to be made in the aggregate amount of $9,175,373, the source of
which is and will be working capital.

Item 4.  Purpose of Transaction.

On September 14, 2000, NEON Communications and Exelon Ventures Corp. completed a
transaction  (the  "Transaction")  which involved,  among other things,  (i) the
issuance by NEON Communications of the 2,131,143 shares of its Common Stock (the
"Shares")  to Exelon  Ventures  Corp.  in exchange  for the  agreement by Exelon
Ventures Corp. to pay to NEON Communications $9,175,373, $4,032,375 of which was
paid at  closing,  and Exelon  Ventures  Corp.'s  agreement  to provide  certain
intangible rights of use and services related thereto.

The Shares were acquired as an investment in connection  with the  completion of
the Transaction.

On the same date, NEON  Communications and Consolidated  Edison  Communications,
Inc. ("CEC") completed a similar transaction (the "CEC Transaction").

In connection with the Transaction and the CEC Transaction, NEON Communications'
Board of Directors was set at nine members. One individual  designated by Exelon
Ventures Corp. and one individual designated by CEC were elected to the Board of
Directors of NEON Communications on September 14, 2000.

Although  neither PECO Energy Company nor Exelon Ventures Corp.  ("the Reporting
Persons") have any current  intention to do so, the Reporting  Persons may, from
time to time,  determine to purchase additional shares of NEON Communications on
the open market, in negotiated transactions, pursuant to the rights described in
Item 6, below,  or  otherwise.  Although the  Reporting  Persons have no current
intention to do so, the Reporting Persons may also sell the Shares.

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  Communications
beneficially  owned by each  Reporting  Persons and by each  executive  officer,
director and controlling  person,  if any, of the Reporting  Persons,  and, with
respect to the knowledge of the Reporting  Persons,  each other party who may be
deemed  together with Exelon  Ventures  Corp. to constitute a group.  Any of the
aforementioned  persons  whose  names do not  appear in the  table  below do not
beneficially  own any shares of Common Stock of NEON  Communications.  Except as
otherwise noted,  each person listed has sole voting and dispositive  power over
all shares listed opposite its name.


<PAGE>


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


PECO Energy Company        9,381,916*                              56.3%

Exelon Ventures Corp.      9,381,916*                              56.3%

Consolidated Edison
   Communications, Inc.    9,381,916*                              56.3%

Mode 1
   Communications, Inc.    9,381,916*                              56.3%

PECO  Energy  Company  owns all of the issued and  outstanding  shares of Exelon
Ventures  Corp.,  and is,  therefore,  indirect  beneficial  owner of all of the
Shares.  Pursuant to Section 13(d)(3) under the Securities  Exchange Act, Exelon
Ventures  Corp.,  CEC and Mode 1  Communications,  Inc.  ("Mode  1") may each be
deemed to  beneficially  own the shares of Common  Stock of NEON  Communications
owned by the others as result of the limited agreement as to voting described in
Item 6, below.

*Shared voting power as to all shares for the limited purpose  described in Item
6, below,  and sole  dispositive  power over  2,131,143,  as to Exelon  Ventures
Corp., 2,476,735, as to CEC, and 4,774,038, as to Mode 1.


No person named in response to Item 2 has effected any  transaction in the class
of  securities  reported  on during the past 60 days.  To the  knowledge  of the
Reporting  Persons  named  herein,  neither  CEC  nor  Mode 1 has  effected  any
transaction in the class of securities reported on during the past 60 days.

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

Subscription Agreement
----------------------

As noted in Item 3, Exelon Ventures Corp. and NEON Communications are parties to
a Subscription  Agreement  pursuant to which the Reporting  Persons acquired the
Shares.

Stockholders' Agreement
-----------------------

Exelon  Ventures  Corp.,   CEC,  Mode  1   (collectively,   "Stockholders"   and
individually  a  "Stockholder")  and  NEON   Communications  are  parties  to  a
Stockholders'  Agreement  dated  as  of  September  14,  2000  under  which  the
Stockholders  agreed  to  vote  all  of the  shares  of  Common  Stock  of  NEON
Communications owned by them or over which any of them had voting control, so as
to fix the numbers of directors  of NEON  Communications  at nine,  to elect two
directors designated by Mode 1 initially John H. Forsgren and Gary D. Simon, one
director designated by Exelon Ventures Corp., 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.

<PAGE>

Each of the  Stockholders  also granted to the other  Stockholders on a pro rata
basis  certain  rights of first offer with respect to any  transfers  (including
upon the  occurrence of certain  bankruptcy  or insolvency  events) of shares of
Common Stock of Neon  Communications  owned by it, except for transfers of up to
160,000  shares  within  any  rolling  12-month  period,  transfers  to  certain
affiliated parties, and certain transactions that involve a change in control of
the ultimate parent of the Stockholder.

In addition, under a certain FiveCom, Inc. Principal Stockholders Agreement (the
"CMP  Agreement"),  dated May 28, 1998 between  Northeast  Utitilies,  Inc., the
parent of Mode 1, and  Central  Maine  Power  Company  ("CMP"),  Mode 1 and NEON
Communications  have  certain  rights to acquire  shares of NEON  Communications
owned by CMP and NEON  Communications  has certain  rights to acquire its shares
owned by Mode 1, in each  case in the  event  of a third  party  offer  for such
shares or upon the occurrence of certain bankruptcy and insolvency events.  NEON
Communications  has granted to each of the  Stockholders  on a pro rata basis an
option to acquire any shares of NEON  Communications  which NEON  Communications
has a right to  acquire  from CMP  under  the CMP  Agreement  and to each of the
Stockholders  other  than Mode 1 on a pro rata  basis an option to  acquire  any
shares of NEON  Communications  which NEON Communications has a right to acquire
from Mode 1 under the CMP Agreement.  NEON Communications has agreed to exercise
its  rights  under  the CMP  Agreement  upon  exercise  of these  rights  by the
Stockholders.


Registration Rights Agreement
-----------------------------

Under  the  terms  of  a  Registration  Rights  Agreement,   (the  "Registration
Agreement") among NEON Communications, Exelon Ventures Corp. and CEC dated as of
September 14, 2000, NEON Communications granted to each of Exelon Ventures Corp.
(with  respect  to the  Shares)  and CEC  (with  respect  to the  shares of NEON
Communications  which  CEC  acquired  in the CEC  Transaction)  the right to one
demand  registration on Form S-3 at any time after the first  anniversary of the
date  of  closing  of  the  Transaction,   and  to  participate  in  the  demand
registration  of the other,  which such  offering(s)  may be underwritten at the
election  of  the  initiating  holder(s).  In the  event  that  Form  S-3 is not
available,  Exelon  Ventures  Corp.  and CEC are entitled to jointly  demand one
registration  on Form S-1 in lieu of their right to demand  registration on Form
S-3. In addition, Exelon Ventures Corp. and CEC were granted certain "piggyback"
registration  rights under the terms of the Registration  Rights  Agreement.  In
connection  with any such  registration,  NEON  Communications  and the  selling
holders  will  mutually  indemnify  each  other  against  certain   liabilities,
including liabilities under the federal securities laws.


Item 7.  Material to be Filed as Exhibits.
Exhibit  A:  Subscription  Agreement  dated November 23, 1999,  incorporated  by
         reference  to Exhibit  10.45 to the Annual  Report on Form 10-K for the
         year ended December 31, 1999 filed by Northeast Optic Network Inc.
Exhibit B: Stockholders' Agreement dated September 14, 2000.
Exhibit C: Registration Rights Agreement dated September 14, 2000.




<PAGE>


                                    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: September 25, 2000

                                        PECO ENERGY COMPANY



                                        By:          /s/ Gregory A. Cucchi
                                                     ------------------------

                                        Name:        Gregory A. Cucchi
                                                     ------------------------

                                        Title:       Senior Vice-President
                                                     ------------------------



                                        EXELON VENTURES CORP.



                                        By:          /s/ Gregory A. Cucchi
                                                     ------------------------

                                        Name:        Gregory A. Cucchi
                                                     ------------------------

                                        Title:       CEO
                                                     ------------------------



         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).


<PAGE>


                             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: September 25, 2000

PECO ENERGY COMPANY


By:           /s/ Gregory A. Cucchi
              ----------------------------------------

Name:              Gregory A. Cucchi
              ----------------------------------------

Title:              Senior Vice-President
              ----------------------------------------


EXELON VENTURES CORP.


By:           /s/ Gregory A. Cucchi
              ----------------------------------------

Name:              Gregory A. Cuccchi
              ----------------------------------------

Title:              CEO
              ----------------------------------------



<PAGE>


                            NEON COMMUNICATIONS, INC.

                             STOCKHOLDERS'AGREEMENT

         This Stockholders' Agreement dated as of September 14, 2000, is entered
into by and among Mode 1 Communications,  Inc. a Connecticut corporation ("M1"),
Exelon  Ventures  Corp., a  Pennsylvania  corporation  ("Exelon"),  Consolidated
Edison   Communications,   Inc.,  a  New  York  corporation   ("CEC")  and  NEON
Communications, Inc., a Delaware corporation (the "Company"). M1, Exelon and CEC
are sometimes referred to in this Agreement collectively as the "Stockholders."

                                    Recitals:

         A. M1 owns, either directly or indirectly,  certain  outstanding shares
of the Common Stock, par value $.01 per share ("Common Stock"), of the Company;

         B. Exelon and CEC shall receive  certain  shares of the Common Stock of
the  Company  pursuant  to  the  transactions   contemplated  by  those  certain
Subscription  Agreements,  dated as of  November  23,  1999,  by and between the
Company, NorthEast Optic Network, Inc. and each of Exelon and CEC (as amended to
date, the  "Subscription  Agreements"),  and those certain System  Agreements of
even date  herewith,  by and  between  the  Company  and each of Exelon  and CEC
(together with the Subscription Agreements, the "Touchdown Agreements"); and

         C. The Company and the Stockholders  wish to provide for the continuing
representation  of the  Stockholders on the Board of Directors of the Company in
the manner set forth below.

         In  consideration  of the  mutual  covenants  contained  herein and the
consummation of the transactions  contemplated by the Touchdown Agreements,  and
for other valuable consideration,  receipt of which is hereby acknowledged,  the
parties hereto agree as follows:

         1. Voting of Shares.

(a) In any and all  elections of directors of the Company  (whether at a meeting
or by written  consent in lieu of a  meeting),  each  Stockholder  shall vote or
cause to be voted all  Shares (as  defined  in Section 2 below)  owned by it, or
over which it has voting control, and otherwise use its respective best efforts,
so as to fix the number of directors of the Company at nine and to elect (i) two
members designated by M1, initially John H. Forsgren and Gary D. Simon, (ii) one
member  designated  by  Exelon,  initially  Robert A. Shinn and (iii) one member
designated  by CEC,  initially  Peter  A.  Rust;  provided,  however,  that  the
Stockholders  shall have no  obligation  to elect any designee whom the Board of
Directors  of  the  Company,  in  its  reasonable  discretion,   has  deemed  an
unacceptable candidate for election.


<PAGE>


                  (b)  No   Stockholder   shall  vote  to  remove  any  director
designated by another  Stockholder,  except for bad faith or willful  misconduct
with  respect  to the  business  affairs  of the  Company  on the  part  of such
director.

         2. Shares. "Shares" shall mean and include any and all shares of Common
Stock and/or shares of any other class of the capital  stock of the Company,  by
whatever name called,  which carry voting rights  (including voting rights which
arise by reason of  default)  and shall  include  any such  shares  now owned or
subsequently acquired by a Stockholder,  or any of its respective affiliates, as
such term is defined in Rule 12b-2 of the General  Rules and  Regulations  under
the  Securities  Exchange  Act  of  1934,  as  amended  ("Affiliates"),  however
acquired,  including,  without  limitation,  shares  acquired as a result of any
stock  splits,  stock  dividends  or  recapitalizations.  Without  limiting  the
generality of the foregoing,  "Shares" shall include, as applicable,  all shares
of Common Stock of the Company  received by Exelon or CEC under their respective
Subscription Agreements including,  without limitation, any such shares received
by  Exelon  or  CEC  under   Section   12.04   ("Assignment;   No  Third   Party
Beneficiaries") of their respective Subscription Agreements.

         3.  Reduction in Board  Representation.  Subject to the  provisions  of
Section 4 of this  Agreement,  in the event  that M1 shall  hold a number of the
outstanding  Shares of the  Company  which is both (i) equal to or less than the
lower of the number of such shares then held by either  Exelon or CEC,  and (ii)
less than the number of shares  held by such  entity on the date  hereof  (other
than as a result of a reverse stock split,  recapitalization  or the like), then
Ml shall only be  entitled  to  designate  one member of the Board of  Directors
pursuant to Section 1(a) of this Agreement.

         4. Termination. This Agreement shall terminate in its entirety upon the
sale of all or substantially all of the assets or stock of the Company,  whether
by merger, sale of assets or otherwise.  If any Stockholder shall hold less than
one half of the percentage of the outstanding Shares of the Company beneficially
owned on the date  hereof by Exelon or CEC,  whichever  is lower  (the  "Minimum
Percentage"),  then such Stockholder's rights and obligations hereunder (but not
the rights and obligations of the other Stockholders hereunder) shall terminate.

         5. No Revocation.  The voting  agreements  contained herein are coupled
with an interest and may not be revoked, except by an amendment, modification or
termination  effected in  accordance  with Section 9(e) hereof.  Nothing in this
Section 5 shall be  construed as limiting  the  provisions  of Section 4 or 9(e)
hereof.

         6.  Representations and Warranties.  Each Stockholder hereby represents
and  warrants  to the  others  that,  as of the  date  of this  Agreement,  such
Stockholder  owns,  directly  or  indirectly,  the  number of  Shares  set forth
opposite such Stockholder's name on Schedule 1 hereto.

         7. Legend.  Each of the Stockholders agrees that, upon the execution of
this  Agreement  and for so  long as this  Agreement  remains  in  effect,  such
Stockholder  will  cause all  certificates  for  Shares  now owned or  hereafter
acquired by such  Stockholder  to be submitted to the Company,  which shall then
cause  such  certificates  to be  endorsed  with a legend in  substantially  the
following form:

                  "This  Certificate  and  the  shares  represented  hereby  are
                  subject to the provisions of a Stockholders' Agreement,  dated
                  September 14, 2000, by and among certain  stockholders  of the
                  Company. A copy of that Stockholders'  Agreement is on file at
                  the principal  office of the Company and is available from the
                  Company upon request."

         8.  Right of  First  Offer;  Option  to  Purchase  on  Certain  Events;
Determination of Fair Market Value.


<PAGE>

                  (a)  Right of First  Offer.  Except  as set  forth in the last
sentence of Section 8(a),  in Section 8(e) or in Section  8(h),  no  Stockholder
shall sell,  transfer or otherwise dispose for value or agree to sell,  transfer
or otherwise  dispose for value, in either case directly or indirectly (i.e., if
control of the Stockholder,  or an Affiliate of the Stockholder  which holds its
Shares,  is sold or  otherwise  transferred  to a third  party other than (A) an
Affiliate of the  Stockholder or of such Affiliate of the  Stockholder or (B) in
or by way of any merger,  consolidation,  sale of assets or similar  transaction
where control of the ultimate  parent of the  Stockholder is assumed or acquired
by another  entity whose common shares are publicly  traded ), all or any of its
Shares,  unless in each such case such Stockholder (the "Offering  Stockholder")
shall have first complied with this Agreement.  Such Offering  Stockholder shall
deliver to each of the other Stockholders (the "Offeree Stockholders") a written
notice (the "Offer Notice") of any proposed or intended sale,  transfer or other
disposition  for value of the Shares  (the  "Offered  Securities"),  which Offer
Notice shall:

                      (i)      identify the number of Shares to be transferred;

                      (ii)     describe the price and other terms upon which
                               they are to be sold, transferred or otherwise
                               disposed;

                      (iii)    at the election of the Offering Stockholder,
                               identify  the  persons or  entities to which
                               the  Offered  Securities  are  to  be  sold,
                               transferred   or  otherwise   disposed  (the
                               "Proposed Transferee"); and

                      (iv)     offer  to  sell or  transfer  to each of the
                               Offeree  Stockholders  such  portion  of the
                               Offered  Securities as the aggregate  number
                               of  Shares   then   held  by  such   Offeree
                               Stockholder  bears to the  total  number  of
                               Shares  then  held  by all  of  the  Offeree
                               Stockholders (the "Basic Amount").

The terms set forth in the Offer Notice is referred to herein as the "Offer". In
determining  the pro rata  portions of Shares owned by Exelon or CEC, any Shares
that they have a right to acquire if they satisfy  certain  objectives set forth
in the  Subscription  Agreements  shall  be  deemed  to be owned by them for the
purposes of this  Agreement even if not yet issued to them or issued to them but
subject to divestment if those objectives are not satisfied. Notwithstanding the
foregoing,  any  Stockholder  may sell,  transfer or otherwise  dispose of up to
160,000  Shares in any  rolling  12-month  period,  such  amount to be  adjusted
appropriately in the event of stock splits,  stock dividends,  recapitalizations
and the like, or any or all Shares owned  beneficially by such Stockholder to an
Affiliate of such Stockholder,  in either case without compliance with the terms
of this Section 8.

                  (b) Acceptance Procedures.  To accept an Offer, in whole or in
part,  an Offeree  Stockholder  shall  deliver a written  notice to the Offering
Stockholder  (with copies to the other  parties to this  Agreement)  within five
Business  Days of the  delivery  of the Offer  Notice (the  "Acceptance  Date"),
setting  forth (i) the portion of such Offeree  Stockholder's  Basic Amount that
such  Offeree  Stockholder  elects to purchase  and (ii)  whether  such  Offeree
Stockholder  desires to purchase its pro rata portion or any Offered  Securities
not accepted or purchased by the other Offeree  Stockholders  in accordance with
this Agreement (the "Notice of Acceptance")  and confirming its agreement to pay
105%  of the  price  stipulated  in  Section  8(a)(ii).  For  purposes  of  this
Agreement, "Business Day" shall mean any day other than Saturday, Sunday and any
day which is a legal holiday or a day on which banking institutions in New York,
NY are  authorized  or  required  by  law  or  other  action  of any  applicable
governmental authority to close.

                  (c) Sales Procedures.  If less than all Offered Securities are
subscribed  by a  Notice(s)  of  Acceptance  by the  Acceptance  Date,  then the
provisions  of this  Agreement  shall  be  deemed  satisfied  and  the  Offering
Stockholder,  during the 100 calendar days  following the  Acceptance


<PAGE>

Date,  may sell,  transfer or  otherwise  dispose of the Offered  Securities  on
substantially the terms stated in the Offer Notice and at a price- no lower than
the price set forth in the Offer Notice.  If all of the Offered  Securities have
been  subscribed by a Notice(s) of Acceptance by the Acceptance  Date,  then the
Offeree  Stockholders who have so accepted the Offer shall have 30 calendar days
after the  Acceptance  Date in which to  consummate  the purchase  (the "Closing
Period").  The Closing Period shall be extended by a reasonable  period,  not to
exceed 30 calendar  days, in the event that an Offeree  Stockholder  must obtain
regulatory  approval in order to purchase the Offered  Securities  in compliance
with  applicable  laws.  In the  event  that  any  Offeree  Stockholder  who has
submitted a Notice of Acceptance is unable to consummate the purchase within the
Closing  Period for reasons beyond such Offeree  Stockholder's  control (as such
period may be extended  pursuant to the preceding  sentence),  then the Offering
Stockholder,  within 100  calendar  days  after the  expiration  of the  Closing
Period,  may sell,  transfer or otherwise  dispose of the Offered  Securities on
substantially  the terms stated in the Offer Notice and at a price no lower than
the  price  set  forth in the  Offer  Notice.  Under no  circumstance  shall any
Offering Stockholder be required to consummate a sale to any Offeree Stockholder
unless and until all Offered  Securities  have been subscribed by a Notice(s) of
Acceptance  from one or more Offeree  Stockholders  which are able to consummate
their respective purchases within the Closing Period, or any permitted extension
thereof.  Notwithstanding the fact that the compensation offered by the Proposed
Transferee  has an in-kind  component  (as  discussed  below),  all purchases of
Offered  Securities  by the  Offeree  Stockholders  shall  be made in  cash,  by
certified check or wire transfer of immediately available funds.

                  (d)  Valuation of In-Kind  Compensation.  If the  compensation
offered by the Proposed  Transferee has an in-kind component,  then the Offering
Stockholder  shall  submit  an  appraisal  of the  cash  value  of such  in-kind
component  (which may be  prepared  by the  Offering  Stockholder  or by a third
party, at the Offering Stockholder's  election) to the Offeree Stockholders with
the Offer Notice. If the Offeree Stockholders,  or any of them, desire to obtain
an  independent  appraisal  of the cash  value of the  in-kind  component,  such
Offeree  Stockholders  may do so at their  expense  (to be shared pro rata among
such Offeree  Stockholders),  and, except as set forth in the next sentence, the
Acceptance Period shall run from the date such independent appraisal is rendered
(which date shall not be more than 30 calendar  days after the date of the Offer
Notice). If the Offering Stockholder does not accept such independent appraisal,
or the parties cannot otherwise agree on the cash value of the in-kind component
within 15 calendar days of the delivery of such independent appraisal,  then the
parties shall submit their respective  appraisals to an arbitrator  appointed by
the Boston Office of the American Arbitration Association who will choose one of
the appraisals,  and the Offering Stockholder and the Offeree Stockholders shall
each be  responsible  for a pro rata  portion  of the costs of such  arbitration
process, which decision shall be binding upon the parties.

                  (e)  Option  to   Purchase   on  Certain   Events.   Upon  any
Stockholder's  filing for bankruptcy or other similar  relief,  making a general
assignment  for benefit of its creditors or having a petition for  bankruptcy or
similar  relief filed against it which results in an order not dismissed  within
60 days,  the other  Stockholders  shall have a right of first offer to purchase
their pro rata portions of the Shares owned by such Stockholder's predecessor in
interest  (or,  in  the  case  of  the  debtor  in  possession,  owned  by  such
Stockholder)  under the  procedures  set forth in Sections 8(b) and (c),  except
that (i) the  applicable  purchase  price  shall be the Fair  Market  Value,  as
determined  in  accordance  with  subsection  (f) below,  and (ii) if an Offeree
Stockholder  does  not  receive  an  Offer  Notice,  the  rights  of  the  other
Stockholders  shall  accrue  upon the  receipt  of  actual  notice  of the event
triggering its rights under this subsection (e). The provisions of Sections 8(a)
and 8(b)  above  shall  also  govern in the event  that the  options  under this
subsection (e) are not fully exercised.

                  (f)  Determination  of Fair  Market  Value.  If the  Company's
Common Stock is traded on the Nasdaq  National or Small  Capital  Markets or any
other national securities market, the "Fair Market Value" per share shall be the
average of the closing  prices over the 20 trading days preceding the date as of
which the Fair Market Value is to be determined.  If the Company's  Common Stock
is not so traded,  then the  parties  shall  attempt to agree on the Fair Market
Value of the  Shares.  If


<PAGE>

not agreed to by the parties within 30 calendar days after a request  seeking an
agreement as to Fair Market Value, then the procedures set forth in Section 8(d)
shall apply.

                  (g)  Identity  of the  Proposed  Transferee.  If the  Offering
Stockholder  has elected not to identify  the Proposed  Transferee  in the Offer
Notice and wishes to transfer  the right to designate a director or directors as
permitted  by  Section  l (a) of this  Agreement  relating  to the  election  of
directors of the Company,  then the Offering  Stockholder shall notify the other
parties  to this  Agreement  of the  name  of the  Proposed  Transferee  and the
procedures  set forth in Sections 8(a) - (c) shall  commence again starting with
the delivery of the notice identifying the Proposed Transferee which, along with
the terms set forth in the original Offer Notice, as they may be modified in the
notice identifying the Proposed Transferee,  shall be deemed to constitute a new
Offer Notice.

                  (h) Rights under Principal Stockholders' Agreement.  Northeast
Utilities  ("NU"),  the parent of Ml, is a party to that certain  FiveCom,  Inc.
Principal  Stockholders  Agreement,  dated May 28, 1998 (the "NU/CMP Agreement")
with  Central  Maine  Power  Company  ("CMP").  As long as the NU/CMP  Agreement
remains in effect, the terms of this Section 8(h) shall apply.

                           (i) The Company hereby agrees that, in the event that
the Company is entitled  to purchase  shares of the Common  Stock of the Company
held by CMP,  Mainecom Services or any other Affiliate of CMP (the "CMP Shares")
pursuant to Article 2 of the NU/CMP  Agreement,  the Company will forward to the
Stockholders  a copy of any notice  received by the Company under Section 2.1(a)
or 2.1(b) of the NU/CMP  Agreement,  herein referred to as a "CMP Offer Notice")
within five Business Days of receiving such notice. Except for the price for the
CMP Shares,  which shall be as set forth in the CMP Offer Notice,  and except as
otherwise set forth below,  the procedures set forth in Section 8(b) and Section
8(c) of this  Agreement  shall then apply as if the  Company  were the  Offering
Stockholder  and the CMP Shares were the Offered  Securities.  The Company shall
purchase such number of CMP Shares as have been subscribed for by a Notice(s) of
Acceptance  from one or more Offeree  Stockholders  which are able to consummate
their  respective  purchases  within the Closing Period,  which, for purposes of
this Section 8(h)(i) shall be deemed to end no later than 30 calendar days after
delivery of the CMP Offer  Notice to the Company (up to the total  number of CMP
Shares  offered  to the  Company  in the CMP  Offer  Notice).  If the  Company's
entitlement to purchase the CMP Shares arises  pursuant to Section 2.1(b) of the
NU/CMP  Agreement,  the  Closing  Period  may be  extended  for a period  of 120
calendar  days after the date on which CMP or the Company makes a request for an
agreement as to Fair Market Value,  as provided in Section  2.1(c) of the NU/CMP
Agreement,  and the Offeree  Stockholders who have agreed to purchase CMP Shares
hereby  agree  to pay  the  Fair  Market  Value  negotiated  by the  Company  in
accordance  with the  provisions  of  Section  2.1(c) of the  NU/CMP  Agreement.
Notwithstanding  anything in Section 8(c) of this Agreement to the contrary, the
Offeree  Stockholders  who have agreed to purchase  CMP Shares will  deposit the
purchase  price for their portion of the CMP Shares with the Company on or prior
to the last day of the  Closing  Period,  and the Company  will  deliver to each
Offeree  Stockholder  the number of CMP  Shares  subscribed  to by such  Offeree
Stockholder  promptly upon  delivery of such shares to the Company.  Any Offeree
Stockholder  who fails to deposit the purchase  price for its portion of the CMP
Shares on or prior to the last day of the Closing Period shall be deemed to have
withdrawn its Notice of Acceptance.

                           (ii)   Notwithstanding   anything  to  the   contrary
contained in this Agreement, M1 shall satisfy its obligations under Section 8(a)
of this  Agreement by sending a copy of the Offer Notice to the Company (the "M1
Offer Notice", which term shall include any notice received by the Company under
Section 2.1(a) or 2.1(b) of the NU/CMP Agreement). The Company shall immediately
forward a copy of the M1 Offer Notice to the other Stockholders,  and, except as
set forth below,  the  procedures  set forth in Section 8(b) and Section 8(c) of
this Agreement shall then apply as if the Company were the Offering Stockholder.
The Company  shall  purchase  such number of Offered  Securities  offered to the
Company in the M1 Offer  Notice as have been  subscribed  for by a Notice(s)  of
Acceptance  from one or more Offeree  Stockholders  which are able to consummate
their  respective



<PAGE>

purchases  within the  Closing  Period,  which,  for  purposes  of this  Section
8(h)(ii)  shall be deemed to be no later than 30 calendar days after delivery of
the M1 Offer Notice to the Company, unless the Company is purchasing the Offered
Securities  pursuant to Section 2.1(b) of the NU/CMP Agreement in which case the
Closing  Period may be extended for a period of 120 calendar days after the date
on which NU or the Company  makes a request for an  agreement  as to Fair Market
Value (as defined in the NU/CMP Agreement),  provided, however, NU hereby agrees
that the Fair Market Value shall be determined  in accordance  with Section 8(f)
of this  Agreement  and not the NU/CMP  Agreement.  Notwithstanding  anything in
Section 8(c) of this  Agreement to the contrary,  the Offeree  Stockholders  who
have agreed to purchase  Offered  Securities  under this Section  8(h)(ii)  will
deposit the purchase price for their portion of the Offered  Securities with the
Company on or prior to the last day of the Closing Period,  and the Company will
deliver to each Offeree Stockholder the number of Offered Securities  subscribed
to by such  Offeree  Stockholder  promptly  upon  delivery of such shares to the
Company. Any Offeree Stockholder who fails to deposit the purchase price for its
portion of the Offered  Securities  set forth in the M1 Offer Notice on or prior
to the last day of the  Closing  Period  shall be deemed to have  withdrawn  its
Notice of Acceptance.

                  (iii) NU agrees  that it will  enforce the  obligation  of CMP
under the NU/CMP  Agreement  to offer the CMP Shares to the Company  pursuant to
the terms of Article 2 of the NU/CMP Agreement.

         9. General.

                  (a) Severability.  The invalidity or  unenforceability  of any
provision of this Agreement shall not affect the validity or  enforceability  of
any other provision of this Agreement.

                  (b)  Specific  Performance.  In  addition to any and all other
remedies  that  may be  available  at law in the  event  of any  breach  of this
Agreement,  each  Stockholder  shall be entitled to specific  performance of the
agreements and obligations of the other Stockholders hereunder and to such other
injunctive or other  equitable  relief as may be granted by a court of competent
jurisdiction.

                  (c)  Governing  Law. This  Agreement  shall be governed by and
construed in accordance with the internal laws of the State of Delaware (without
reference to the conflicts of law provisions thereof).

                  (d) 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)  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 M1:

                  Mode 1 Communications, Inc.
                  107 Selden Street
                  Berlin, CT 06037
                  Attention: John H. Forsgren
                  Facsimile: (860) 665-3718

         if to Exelon:

                  Exelon Ventures Corp.
                  2301 Market Street
                  Philadelphia, PA 19101
                  Attention: President
                  Facsimile: (215) 841-6374


<PAGE>

                  with a copy to:

                  PECO Law Department
                  2301 Market Street, 23rd Floor
                  Philadelphia, PA 19101
                  Attention: John Halderman
                  Facsimile: 215-841-4474

         if to CEC:

                  Consolidated Edison Communications, Inc.
                  132 West 31st Street, 13th Floor
                  New York, NY 10001
                  Attention: President
                  Facsimile: (212) 324-5050

                   with a copy to:

                  Consolidated Edison, Inc.
                  4 Irving Place, Room 1800
                  New York, NY 10003
                  Attention: Senior Vice President and General Counsel
                  Facsimile: (212) 674-7329

                   if to the Company:

                  NorthEast Optic Network, Inc.
                  2200 West Park Drive
                  Westborough, MA 01581
                  Attention: President
                  Facsimile: (508) 616-7895

                  (e) Complete Agreement; Amendments. This Agreement constitutes
the entire agreement and understanding of the parties hereto with respect to the
subject matter hereof,  and supersedes all prior  agreements and  understandings
relating to such subject matter.  No amendment,  modification or termination of,
or waiver  under,  any  provision  of this  Agreement  shall be valid  unless in
writing and signed by all  Stockholders  (and, with respect to Section 8(h), the
Company and NU).

                  (f) Pronouns.  Whenever the context may require,  any pronouns
used in this Agreement shall include the  corresponding  masculine,  feminine or
neuter  forms,  and the singular  form of nouns and pronouns  shall  include the
plural, and vice versa.

                  (g) Counterparts;  Facsimile Signatures. This Agreement may be
executed in any number of  counterparts,  each of which shall be deemed to be an
original,  and all of which together shall constitute one and the same document.
This Agreement may be executed by facsimile signatures.

                  (h)  Section  Headings.  The  section  headings  are  for  the
convenience of the parties and in no way alter, modify, amend, limit or restrict
the contractual obligations of the parties.

                  (i)   Assignment;   Transfers   of  Shares;   No  Third  Party
Beneficiaries; Successors and Assigns.



<PAGE>

                           (1) No Stockholder  hereunder shall assign its rights
or obligations  under this Agreement to any third person or entity (except to an
Affiliate of such Stockholder), unless and until (a) such Stockholder shall have
complied with Section 8 hereof and (b) such  Stockholder  shall have transferred
to such assignee an amount of Shares (i) which  constitutes at least the Minimum
Percentage  and (ii)  such  that,  after  giving  effect to such  transfer,  the
Stockholder no longer holds any Shares, provided that such transferee shall have
agreed to be bound by the terms of this Agreement.

                           (2) The  Company  shall not  effect any  transfer  of
Shares in connection  with any transfer or assignment not in compliance with the
terms of this Agreement.

                           (3) Nothing in this  Agreement  is intended to confer
upon any  other  person  not party to this  Agreement  any  rights  or  remedies
hereunder.

                           (4) The terms of his Agreement  shall be binding upon
the parties hereto and their respective successors and assigns.

                  (j)  Effectiveness.  This Agreement  shall become binding upon
each party upon execution of this  Agreement by such party.  No party shall have
the right to exercise its rights under this Agreement until it has executed this
Agreement.


              [the remainder of this page intentionally left blank]


<PAGE>



         IN  WITNESS  WHEREOF,   the  parties  have  caused  this  Stockholders'
Agreement  to be  executed by their duly  authorized  officers as of the day and
year first above written.

                          MODE 1 COMMUNICATIONS, INC.


                          By:    /s/ David R. McHale
                                ---------------------------------------
                          Name:  David R. McHale
                                ---------------------------------------
                          Title: Vice President and Treasurer
                                ---------------------------------------


                          EXELON VENTURES CORP.


                          By:    /s/ Gregory A. Cucchi
                                ---------------------------------------
                          Name:  Gregory A. Cucchi
                                ---------------------------------------
                          Title: Chairman and Chief Executive Officer
                                ---------------------------------------


                          CONSOLIDATED EDISON
                          COMMUNICATIONS, INC.


                          By:    /s/ John F. Pinto
                                ---------------------------------------
                          Name:  John F. Pinto
                                ---------------------------------------
                          Title: Vice President
                                ---------------------------------------


                          NEON COMMUNICATIONS, INC.


                          By:    /s/ Victor Colantonio
                                ---------------------------------------
                          Name:  Victor Colantonio
                                ---------------------------------------
                          Title: President
                                ---------------------------------------

         Northeast  Utilities  executed  this  Agreement for the sole purpose of
being bound by its obligations under Section 8(h) hereof.

                          NORTHEAST UTILITIES


                          By:    /s/ David R. McHale
                                ---------------------------------------
                          Name:  David R. McHale
                                ---------------------------------------
                          Title: Vice President and Treasurer
                                ---------------------------------------



<PAGE>


Schedule 1

Mode 1 Communications, Inc.                         4,774,038  Shares
                                                  -------------

Exelon Ventures Corp.                               2,131,143  Shares
                                                  -------------

Consolidated Edison
Communications, Inc.                                2,476,735  Shares
                                                  -------------



<PAGE>



                            NEON COMMUNICATIONS, INC.

                          REGISTRATION RIGHTS AGREEMENT


         This  Agreement  dated as of September  14, 2000 is entered into by and
among  NEON  Communications,  Inc.,  a  Delaware  corporation  (the  "Company"),
Consolidated  Edison  Communications,  Inc., a New York corporation  ("CEC") and
Exelon Ventures Corp., a Pennsylvania  corporation ("Exelon",  and together with
CEC, the "Investors").

                                    Recitals

         WHEREAS, the Company has entered into a separate Subscription Agreement
with each of CEC and Exelon  dated as of November  23, 1999 (as amended to date,
the "Subscription Agreements"); and

         WHEREAS,  the Company and the  Investors  desire to provide for certain
arrangements  with respect to the registration of shares of capital stock of the
Company under the Securities Act of 1933;

         NOW,  THEREFORE,  in consideration of the mutual promises and covenants
contained in this Agreement, the parties hereto agree as follows:

         1. Certain Definitions.

         As used in this Agreement, the following terms shall have the following
respective meanings:

                  "Business Day" means any day other than  Saturday,  Sunday and
any day which is a legal holiday or a day on which banking  institutions  in New
York are  authorized  or  required  by law or  other  action  of a  governmental
authority to close.

                  "Commission" means the Securities and Exchange Commission,  or
any other federal agency at the time administering the Securities Act.

                  "Common  Stock"  means the  common  stock,  $.01 par value per
share, of the Company.

                  "Exchange Act" means the  Securities  Exchange Act of 1934, as
amended, or any successor federal statute,  and the rules and regulations of the
Commission  issued  under such Act, as they each may,  from time to time,  be in
effect.

                  "Initiating   Holders"   means  the   Investor  or   Investors
initiating a request for registration pursuant to Section 2.1(a).

                  "Other Holders" shall have the meaning set forth in Section 2.
1(c).

                  "Prospectus" means the prospectus included in any Registration
Statement,  as amended or supplemented by an amendment or prospectus supplement,
including post-effective  amendments, and all material incorporated by reference
or deemed to be incorporated by reference in such Prospectus.

                  "Registration  Statement" means a registration statement filed
by the Company with the Commission for a public  offering and sale of securities
of the Company (other than a registration  statement on Form S-8 or Form S-4, or
their  successors,  or any other  form for a  similar  limited  purpose,  or any
registration  statement  covering  only  securities  proposed  to be  issued  in
exchange for securities or assets of another corporation).

<PAGE>

                  "Registration   Expenses"  means  the  expenses  described  in
Section 2.4.

                  "Registrable  Shares"  means (i) the Shares and (ii) any other
shares of Common Stock issued in respect of the Shares (because of stock splits,
stock  dividends,  reclassifications,  recapitalizations,  or  similar  events);
provided,  however,  that shares of Common  Stock which are  Registrable  Shares
shall  cease  to  be  Registrable  Shares  upon  (i)  any  sale  pursuant  to  a
Registration  Statement  or  Rule  144  under  the  Securities  Act  (ii)  their
eligibility  for sale pursuant to Rule 144(k) under the  Securities Act or (iii)
any sale in any  manner to a person or entity  which,  by virtue of Section 3 of
this Agreement, is not entitled to the rights provided by this Agreement.

                  "Securities Act" means the Securities Act of 1933, as amended,
or  any  successor  federal  statute,  and  the  rules  and  regulations  of the
Commission  issued  under such Act, as they each may,  from time to time,  be in
effect.

                  "Selling Stockholder" means any Stockholder owning Registrable
Shares included in a Registration Statement.

                  "Shares"  means the CEC NEON shares and the Exelon NEON shares
as defined in the Subscription Agreements.

                  "Stockholders" means the Investors and any persons or entities
to  whom  the  rights  granted  under  this  Agreement  are  transferred  by any
Investors, their successors or assigns pursuant to Section 3 hereof.

         2. Registration Rights.

            2.1 Required Registrations.

                  (1) At any time after the first  anniversary of the closing of
the Subscription  Agreements,  either Investor may request, in writing, that the
Company effect the  registration on Form S-3 (or any successor form or any other
registration statement form which the Company is eligible to use) of Registrable
Shares owned by such Investor having an aggregate  value of at least  $5,000,000
(based on the then current market price or fair value).

                  (2) Upon receipt of any request for  registration  pursuant to
this Section 2, the Company shall  promptly give written notice of such proposed
registration to all other Stockholders.  Such Stockholders shall have the right,
by  giving  written  notice to the  Company  within  30 days  after the  Company
provides  its notice,  to elect to have  included in such  registration  such of
their  Registrable  Shares as such  Stockholders  may  request in such notice of
election, subject in the case of an underwritten offering to the approval of the
managing underwriter as provided in Section 2.1(c) below. Thereupon, the Company
shall, as expeditiously as possible,  effect the registration of all Registrable
Shares which the Company has been requested to so register.

                  (3)  If  the  Initiating  Holders  intend  to  distribute  the
Registrable  Shares covered by their request by means of an  underwriting,  they
shall so advise the Company as a part of their  request made pursuant to Section
2.1(a),  and the Company shall include such  information  in its written  notice
referred to in Section 2.1(b). The right of any other Stockholder to include its
Registrable  Shares in such  registration  pursuant to Section  2.1(a)  shall be
conditioned upon such other Stockholder's  participation in such underwriting on
the terms  set  forth  herein.  If the  Company  desires  that any  officers  or
directors of the Company  holding  securities  of the Company be included in any
registration for an underwritten  offering  requested pursuant to Section 2.1(c)
or if other holders of  securities of the Company who are entitled,  by contract



<PAGE>

with, or other instrument  executed by, the Company prior to the date hereof, to
have securities  included in such a registration  (the "Other Holders")  request
such  inclusion,  the  Company  may include  the  securities  of such  officers,
directors and Other Holders in such  registration  and underwriting on the terms
set forth herein.  The Company shall (together with all Stockholders,  officers,
directors and Other Holders  proposing to distribute  their  securities  through
such  underwriting)  enter into an  underwriting  agreement  in  customary  form
(including,  without  limitation,  customary  indemnification  and  contribution
provisions on the part of the Company) with the managing  underwriter;  provided
that such  underwriting  agreement  shall not  provide  for  indemnification  or
contribution obligations on the part of Stockholders materially greater than the
obligations of the  Stockholders  pursuant to Section 2.5.  Notwithstanding  any
other provision of this Section 2.1(c), if the managing  underwriter advises the
Company  that the  inclusion  of all shares  requested  to be  registered  would
adversely affect the offering, the securities of the Company held by officers or
directors of the Company (other than Registrable  Shares) shall be excluded from
such  registration  and  underwriting  to the  extent  deemed  advisable  by the
managing  underwriter,  and if a further  limitation  of the number of shares is
required,  the number of shares that may be included  in such  registration  and
underwriting  shall  be  allocated  among  all  Other  Holders  and  holders  of
Registrable  Shares pro rata in  proportion to the  respective  number of shares
they have  requested  to be  registered.  If any holder of  Registrable  Shares,
officer,   director  or  Other  Holder  who  has  requested  inclusion  in  such
registration  as provided above  disapproves  of the terms of the  underwriting,
such person may elect to withdraw  therefrom  by written  notice to the Company,
and the securities so withdrawn  shall also be withdrawn from  registration.  If
the managing  underwriter  has not limited the number of  Registrable  Shares or
other securities to be underwritten,  the Company may include securities for its
own account in such  registration  if the managing  underwriter so agrees and if
the number of Registrable Shares and other securities which would otherwise have
been included in such registration and underwriting will not thereby be limited.

                  (4) The Initiating  Holders shall have the right to select the
managing  underwriter(s)  for any underwritten  offering  requested  pursuant to
Section 2.1(a),  subject to the approval of the Company, which approval will not
be unreasonably withheld.

                  (5) The Company  shall not be required to effect more than two
registrations   pursuant  to  Section  2.1(a),  and  neither  Investor,   acting
individually,  shall be entitled to request a  registration  pursuant to Section
2.1(a) more than once. In addition,  in the event that Form S-3 is not available
to the  Company,  the  Company  shall not be  required  to effect  more than one
registration on Form S-1 pursuant to Section 2.1(a), and any request to effect a
registration on Form S-1 shall be made jointly by both  Investors.  For purposes
of this Section 2.1(e), a Registration Statement shall not be counted until such
time  as  such  Registration  Statement  has  been  declared  effective  by  the
Commission  (unless  the  Initiating  Holders  withdraw  their  request for such
registration  (other than as a result of information  concerning the business or
financial condition of the Company which is made known to the Stockholders after
the date on which  such  registration  was  requested)  and elect not to pay the
Registration Expenses therefor pursuant to Section 2.4).

                  (6) If at the  time of any  request  to  register  Registrable
Shares by  Initiating  Holders  pursuant  to this  Section  2.1,  the Company is
engaged or has plans to engage in a registered  public offering or is engaged in
any other activity which, in the good faith determination of the Company's Board
of Directors,  would be adversely affected by the requested  registration,  then
the Company may at its option  direct that such  request be delayed for a period
not in excess of 90 days from the date of such  request,  such  right to delay a
request  to be  exercised  by the  Company  not more than  once in any  12-month
period.

         2.2 Incidental Registration.

                  (1)  Whenever  the  Company  proposes  to file a  Registration
Statement (other than a Registration Statement filed pursuant to Section 2.1) at



<PAGE>

any time and from time to time,  it will,  prior to such  filing,  give  written
notice to all  Stockholders  of its intention to do so;  provided,  that no such
notice need be given if no  Registrable  Shares are to be included  therein as a
result of a  determination  of the  managing  underwriter  pursuant  to  Section
2.2(b).  Upon the written request of a Stockholder or Stockholders  given within
20 days after the Company  provides such notice,  the Company shall use its best
efforts to cause all Registrable  Shares which the Company has been requested by
such  Stockholder  or  Stockholders  to  register  to be  registered  under  the
Securities Act to the extent necessary to permit their sale or other disposition
in accordance with the intended methods of distribution specified in the request
of such  Stockholder or  Stockholders;  provided that the Company shall have the
right to postpone or withdraw any registration effected pursuant to this Section
2.2 without obligation to any Stockholder.

                  (2) If the  registration  for which the Company  gives  notice
pursuant  to  Section  2.2(a)  is a  registered  public  offering  involving  an
underwriting,  the  Company  shall so advise the  Stockholders  as a part of the
written notice given pursuant to Section 2.2(a). In such event, the right of any
Stockholder to include its Registrable  Shares in such registration  pursuant to
Section 2.2 shall be conditioned upon such  Stockholder's  participation in such
underwriting  on the terms set  forth  herein.  All  Stockholders  proposing  to
distribute  their  securities  through  such  underwriting  shall  enter into an
underwriting  agreement in customary form with the  underwriter or  underwriters
selected  for  the  underwriting  by  the  Company.  Notwithstanding  any  other
provision of this Section 2.2, if the managing  underwriter  determines that the
inclusion of all shares  requested to be registered  would adversely  affect the
offering,  the Company may limit the number of Registrable Shares to be included
in the registration and underwriting. The Company shall so advise all holders of
Registrable  Shares requesting  registration,  and the number of shares that are
entitled to be included in the registration and underwriting  shall be allocated
in the  following  manner.  The  securities of the Company held by holders other
than Stockholders and Other Holders shall be excluded from such registration and
underwriting to the extent deemed advisable by the managing underwriter, and, if
a further  limitation on the number of shares is required,  the number of shares
that may be included in such  registration and  underwriting  shall be allocated
among all Stockholders and Other Holders requesting  registration in proportion,
as nearly as  practicable,  to the  respective  number of shares of Common Stock
which they held at the time the Company  gives the notice  specified  in Section
2.2(a).  If any  Stockholder  or Other  Holder would thus be entitled to include
more securities than such holder requested to be registered, the excess shall be
allocated among other requesting  Stockholders and Other Holders pro rata in the
manner described in the preceding sentence.  If any holder of Registrable Shares
or any officer,  director or Other Holder  disapproves  of the terms of any such
underwriting,  such person may elect to withdraw  therefrom by written notice to
the  Company,  and any  Registrable  Shares  or  other  securities  excluded  or
withdrawn from such underwriting shall be withdrawn from such registration.

                  (c)  Notwithstanding  the foregoing,  the Company shall not be
required,  pursuant to this Section 2.2, to include any Registrable  Shares in a
Registration  Statement if such Registrable  Shares can then be sold pursuant to
Rule 144(k) under the Securities Act.



         2.3 Registration Procedures.

         (1) If and whenever the Company is required by the  provisions  of this
Agreement to use its best efforts to effect the  registration of any Registrable
Shares under the Securities Act, the Company shall:

                  (1) file with the  Commission a  Registration  Statement  with
respect  to such  Registrable  Shares  and use its best  efforts  to cause  that
Registration Statement to become effective as soon as possible;

<PAGE>

                  (2) as  expeditiously  as  possible  prepare and file with the
Commission any amendments and supplements to the Registration  Statement and the
prospectus included in the Registration  Statement as may be necessary to comply
with the provisions of the  Securities Act (including the anti-fraud  provisions
thereof) and to keep the Registration Statement effective for 12 months from the
effective date or such lesser period until all such Registrable Shares are sold;

                  (3) as  expeditiously  as  possible  furnish  to each  Selling
Stockholder  such reasonable  number of copies of the Prospectus,  including any
preliminary  Prospectus,  in conformity with the  requirements of the Securities
Act, and such other documents as such Selling Stockholder may reasonably request
in order to facilitate the public sale or other  disposition of the  Registrable
Shares owned by such Selling Stockholder;

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

                  (5) as expeditiously  as possible,  cause all such Registrable
Shares to be listed on each securities exchange or automated quotation system on
which similar securities issued by the Company are then listed;

                  (6) promptly  provide a transfer  agent and  registrar for all
such Registrable  Shares not later than the effective date of such  registration
statement;

                  (7) promptly  make  available  for  inspection  by the Selling
Stockholders, any managing underwriter participating in any disposition pursuant
to such  Registration  Statement,  and any attorney or accountant or other agent
retained by any such  underwriter or selected by the Selling  Stockholders,  all
financial and. other records,  pertinent  corporate  documents and properties of
the  Company  and  cause  the  Company's  officers,  directors,   employees  and
independent  accountants to supply all information  reasonably  requested by any
such seller, underwriter,  attorney, accountant or agent in connection with such
Registration Statement;

                  (8)  as  expeditiously   as  possible,   notify  each  Selling
Stockholder,  promptly after it shall receive notice  thereof,  of the time when
such  Registration  Statement  has  become  effective  or a  supplement  to  any
Prospectus forming a part of such Registration Statement has been filed; and

                  (9) as expeditiously as possible  following the  effectiveness
of such Registration Statement, notify each seller of such Registrable Shares of
any  request  by the  Commission  for  the  amending  or  supplementing  of such
Registration Statement or Prospectus.

         (2)  If  the  Company  has   delivered  a  Prospectus  to  the  Selling
Stockholders  and after having done so the  Prospectus is amended to comply with
the  requirements  of the Securities  Act, the Company shall promptly notify the
Selling   Stockholders  and,  if  requested,   the  Selling  Stockholders  shall
immediately   cease  making  offers  of   Registrable   Shares  and  return  all
Prospectuses  to the Company.  The Company  shall  promptly  provide the Selling
Stockholders  with revised  Prospectuses  and,  following receipt of the revised
Prospectuses,  the Selling Stockholders shall be free to resume making offers of
the Registrable Shares.

         (3) In the event that, in the judgment of the Company,  it is advisable
to suspend use of a  Prospectus  included  in a  Registration  Statement  due to



<PAGE>

pending  material  developments  or other events that have not yet been publicly
disclosed  and as to which  the  Company  believes  public  disclosure  would be
detrimental to the Company, the Company shall notify all Selling Stockholders to
such effect,  and,  upon receipt of such notice,  each such Selling  Stockholder
shall immediately  discontinue any sales of Registrable  Shares pursuant to such
Registration  Statement until such Selling  Stockholder has received copies of a
supplemented or amended Prospectus or until such Selling  Stockholder is advised
in writing by the Company that the then current  Prospectus  may be used and has
received copies of any additional or supplemental  filings that are incorporated
or deemed incorporated by reference in such Prospectus. Notwithstanding anything
to the  contrary  herein,  the Company  shall not exercise its rights under this
Section 2.3(c) to suspend sales of Registrable  Shares for a period in excess of
60 days in any 365-day period.

         2.4  Allocation  of  Expenses.  The Company  will pay all  Registration
Expenses for all registrations under this Agreement;  provided, however, that if
a  registration  under Section 2.1 is withdrawn at the request of the Initiating
Holders  (other  than as a result of  information  concerning  the  business  or
financial condition of the Company which is made known to the Stockholders after
the date on which such registration was requested) and if the Initiating Holders
elect not to have such  registration  counted as a registration  requested under
Section 2.1, the requesting  Stockholders shall pay the Registration Expenses of
such  registration  pro rata in accordance with the number of their  Registrable
Shares  included in such  registration.  For purposes of this Section,  the term
"Registration  Expenses"  shall mean all  expenses  incurred  by the  Company in
complying with this Agreement,  including,  without limitation, all registration
and filing fees, exchange listing fees, printing expenses,  fees and expenses of
counsel for the Company and the fees and expenses of one counsel selected by the
Selling Stockholders to represent the Selling Stockholders,  state Blue Sky fees
and expenses,  and the expense of any special audits  incident to or required by
any such registration, but excluding underwriting discounts, selling commissions
and the fees and expenses of Selling  Stockholders'  own counsel (other than the
counsel selected to represent all Selling Stockholders).

         2.5 Indemnification and Contribution.

                  (1) In the event of any registration of any of the Registrable
Shares under the  Securities  Act pursuant to this  Agreement,  the Company will
indemnify  and  hold  harmless  the  seller  of such  Registrable  Shares,  each
underwriter  of such  Registrable  Shares,  and each other  person,  if any, who
controls such seller or underwriter  within the meaning of the Securities Act or
the Exchange Act against any losses,  claims,  damages or liabilities,  joint or
several,  to which such seller,  underwriter  or  controlling  person may become
subject under the Securities Act, the Exchange Act, state securities or Blue Sky
laws or otherwise,  insofar as such losses,  claims,  damages or liabilities (or
actions in respect  thereof) arise out of or are based upon any untrue statement
or alleged untrue  statement of any material fact contained in any  Registration
Statement  under  which  such  Registrable  Shares  were  registered  under  the
Securities Act, any preliminary  prospectus or final prospectus contained in the
Registration  Statement,  or any amendment or  supplement  to such  Registration
Statement, or arise out of or are based upon the omission or alleged omission to
state a material  fact  required to be stated  therein or  necessary to make the
statements  therein not misleading;  and the Company will reimburse such seller,
underwriter  and each such  controlling  person for any legal or other  expenses
reasonably  incurred  by such  seller,  underwriter  or  controlling  person  in
connection  with  investigating  or  defending  any such  loss,  claim,  damage,
liability or action;  provided,  however, that the Company will not be liable in
any such case to the  extent  that any such  loss,  claim,  damage or  liability
arises out of or is based upon any untrue  statement  or  omission  made in such
Registration  Statement,  preliminary  prospectus  or  prospectus,  or any  such
amendment or  supplement,  in reliance upon and in conformity  with  information
furnished  to  the  Company,  in  writing,  by  or on  behalf  of  such  seller,
underwriter  or  controlling  person  specifically  for  use in the  preparation
thereof.

                  (2) In the event of any registration of any of the Registrable
Shares  under the  Securities  Act  pursuant to this  Agreement,  each seller of
Registrable Shares,  severally and not jointly, will indemnify and hold harmless
the Company,  each of its directors and officers and each  underwriter  (if any)


<PAGE>

and each person, if any, who controls the Company or any such underwriter within
the  meaning of the  Securities  Act or the  Exchange  Act,  against any losses,
claims,  damages or liabilities,  joint or several,  to which the Company,  such
directors and officers,  underwriter  or  controlling  person may become subject
under the Securities  Act,  Exchange Act,  state  securities or Blue Sky laws or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect  thereof) arise out of or are based upon any untrue statement or alleged
untrue  statement of a material  fact  contained in any  Registration  Statement
under which such  Registrable  Shares were registered  under the Securities Act,
any preliminary  prospectus or final  prospectus  contained in the  Registration
Statement,  or any  amendment or supplement to the  Registration  Statement,  or
arise out of or are based  upon any  omission  or  alleged  omission  to state a
material fact required to be stated  therein or necessary to make the statements
therein not  misleading,  if the statement or omission was made in reliance upon
and in conformity with information  relating to such seller furnished in writing
to the Company by or on behalf of such seller specifically for use in connection
with the preparation of such Registration  Statement,  prospectus,  amendment or
supplement;  provided,  however, that the obligations of a Stockholder hereunder
shall be limited to an amount equal to the net proceeds to such  Stockholder  of
Registrable Shares sold in connection with such registration.

                  (3) Each party entitled to indemnification  under this Section
(the  "Indemnified  Party")  shall give notice to the party  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 any such claim or any
litigation  resulting  therefrom;  provided,  that counsel for the  Indemnifying
Party,  who shall  conduct  the  defense of such claim or  litigation,  shall be
approved by the  Indemnified  Party (whose  approval  shall not be  unreasonably
withheld); 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 Section except to the extent that the Indemnifying  Party
is adversely affected by such failure.  The Indemnified Party may participate in
such defense at such party's expense;  provided,  however, that the Indemnifying
Party shall pay such expense if  representation of such Indemnified Party by the
counsel retained by the Indemnifying  Party would be inappropriate due to actual
or potential  differing  interests  between the Indemnified  Party and any other
party represented by such counsel in such proceeding; provided, further, that in
no event shall the  Indemnifying  Party be required to pay the  expenses of more
than one law firm per  jurisdiction  as counsel for the Indemnified  Party.  The
Indemnifying Party also shall be responsible for the expenses of such defense if
the  Indemnifying  Party does not elect to assume such defense.  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 which 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 of such claim or litigation,  and no Indemnified  Party
shall  consent  to entry of any  judgment  or settle  such  claim or  litigation
without the prior written consent of the Indemnifying Party, which consent shall
not be unreasonably withheld.

                  (4) In order to provide for just and equitable contribution in
circumstances in which the  indemnification  provided for in this Section 2.5 is
due in accordance with its terms but for any reason is held to be unavailable to
an Indemnified Party in respect to any losses,  claims,  damages and liabilities
referred to herein,  then the Indemnifying  Party shall, in lieu of indemnifying
such  Indemnified  Party,  contribute  to the  amount  paid or  payable  by such
Indemnified Party as a result of such losses,  claims, damages or liabilities to
which such party may be subject in such  proportion as is appropriate to reflect
the relative  fault of the Company on the one hand and the  Stockholders  on the
other in  connection  with the  statements or omissions  which  resulted in such
losses, claims, damages or liabilities,  as well as any other relevant equitable
considerations.  The relative fault of the Company and the Stockholders shall be
determined by reference  to, among other  things,  whether the untrue or alleged
untrue statement of material fact related to information supplied by the Company
or the  Stockholders  and the parties'  relative  intent,  knowledge,  access to
information and  opportunity to correct;  or prevent such statement or omission.
The Company and the  Stockholders  agree that it would


<PAGE>

not be just and  equitable  if  contribution  pursuant to this  Section 2.5 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.
Notwithstanding  the provisions of this paragraph of Section 2.5, (a) in no case
shall any one  Stockholder be liable or responsible  for any amount in excess of
the net proceeds  received by such  Stockholder from the offering of Registrable
Shares and (b) the  Company  shall be liable and  responsible  for any amount in
excess of such proceeds;  provided, however, that no person guilty of fraudulent
misrepresentation  (within the meaning of Section 11(f) of the  Securities  Act)
shall be  entitled  to  contribution  from any person who was not guilty of such
fraudulent misrepresentation.  Any party entitled to contribution will, promptly
after  receipt  of notice of  commencement  of any  action,  suit or  proceeding
against  such  party in respect  of which a claim for  contribution  may be made
against  another  party or parties  under  this  Section,  notify  such party or
parties from whom contribution may be sought, but the omission so to notify such
party or parties  from whom  contribution  may be sought  shall not relieve such
party from any other  obligation  it or they may have  thereunder  or  otherwise
under this Section.  No party shall be liable for  contribution  with respect to
any action, suit, proceeding or claim settled without its prior written consent,
which consent shall not be unreasonably withheld.

         2.6 Other Matters with Respect to Underwritten  Offerings. In the event
that  Registrable  Shares are sold  pursuant to a  Registration  Statement in an
underwritten  offering  pursuant to Section 2.1, the Company agrees to (a) enter
into  an  underwriting   agreement  containing  customary   representations  and
warranties  with  respect to the  business  and  operations  of the  Company and
customary  covenants and  agreements  to be performed by the Company,  including
without limitation  customary  provisions with respect to indemnification by the
Company of the underwriters of such offering;  (b) use its best efforts to cause
its legal counsel to render customary  opinions to the underwriters with respect
to the  Registration  Statement;  and (c) use its  best  efforts  to  cause  its
independent  public accounting firm to issue customary "cold comfort letters" to
the underwriters with respect to the Registration Statement.

         2.7 Information by Holder.  Each holder of Registrable  Shares included
in any registration shall furnish to the Company such information regarding such
holder  and  the  distribution  proposed  by  such  holder  as the  Company  may
reasonably  request in writing and as shall be required in  connection  with any
registration, qualification or compliance referred to in this Agreement.

         2.8 Confidentiality of Notices.  Any Stockholder  receiving any written
notice from the Company  regarding  the Company's  plans to file a  Registration
Statement  shall treat such notice  confidentially  and shall not disclose  such
information  to any person  other than as necessary to exercise its rights under
this Agreement.

         2.9 Rule 144 Requirements. The Company hereby agrees to:

               (1) make and keep current  public  information  about the Company
available, as those terms are understood and defined in Rule 144;

               (2) file with the  Commission  in a timely manner all reports and
other  documents  required  of the  Company  under  the  Securities  Act and the
Exchange Act; and

               (3) furnish to any holder of Registrable  Shares upon request (i)
a written  statement  by the  Company as to its  compliance  with the  reporting
requirements  of Rule 144 and of the Securities Act and the Exchange Act, (ii) a
copy of the most recent  annual or quarterly  report of the  Company,  and (iii)
such other  reports and  documents of the Company as such holder may  reasonably
request to avail  itself of any similar  rule or  regulation  of the  Commission
allowing it to sell any such securities without registration.


<PAGE>

         2.10  Termination.   All  of  the  Company's  obligations  to  register
Registrable  Shares under Sections 2.1 and 2.2 of this Agreement shall terminate
five (5) years after the date hereof.

         3. Transfers of Rights. This Agreement,  and the rights and obligations
of each  Investor  hereunder,  may be assigned by such Investor to any person or
entity to which at least 25% of the Shares held by such Investor are transferred
by such Investor,  provided,  however, that for purposes of Section 2.1 (a), any
such  transferees,  together  with the  transferring  Investor if such  Investor
continues to hold any Registrable Securities,  shall be counted as one Investor,
and any decision to demand a  registration  pursuant to Section  2.1(a) shall be
made by the  holders of a majority  of the  Registrable  Securities  held by the
transferring Investor and such transferees.


         4. General.

               (1)  Severability.  The  invalidity  or  unenforceability  of any
provision of this Agreement shall not affect the validity or  enforceability  of
any other provision of this Agreement.

               (2)  Specific  Performance.  In  addition  to any and  all  other
remedies  that  may be  available  at law in the  event  of any  breach  of this
Agreement,  each  Investor  shall be  entitled to  specific  performance  of the
agreements and obligations of the Company hereunder and to such other injunctive
or  other  equitable   relief  as  may  be  granted  by  a  court  of  competent
jurisdiction.

               (3)  Governing  Law.  This  Agreement  shall be  governed  by and
construed  in  accordance  with  the  internal  laws  of  the   Commonwealth  of
Massachusetts (without reference to the conflicts of law provisions thereof).

               (4)  Notices.  All  notices,   requests,   consents,   and  other
communications  under this  Agreement  shall be in  writing  and shall be deemed
delivered  (i) two  Business  Days after being sent by  registered  or certified
mail, return receipt  requested,  postage prepaid or (ii) one Business Day after
being sent via a reputable  nationwide  overnight  courier service  guaranteeing
next Business Day delivery,  in each case to the intended recipient as set forth
below:

         If to the Company, to:             NEON Communications, Inc.
                                            2200 West Park Drive
                                            Westborough, MA  01581
                                            Attention:  President

or at such other  address or addresses as may have been  furnished in writing by
the Company to the Investors.

         with a copy to:       Hale and Dorr LLP
                               60 State Street
                               Boston, MA   02109
                               Attention:  Alexander A. Bernhard, Esq.
                               Facsimile Number:  (617) 526-5000

         If to Exelon, to:     Exelon Ventures Corp.
                               2301 Market Street
                               Philadelphia, PA  19101
                               Attention:  President
                               Facsimile:  (215) 841-6374

         with a copy to:       PECO Law Department
                               2301 Market Street, 23rd Floor
                               Philadelphia, PA  19101
                               Attention:  John Halderman
                               Facsimile Number:  (215) 841-4474

<PAGE>

         If to CEC:            Consolidated Edison Communications, Inc.
                               132 West 31st Street, 13th Floor
                               New York, NY  10001
                               Attention:  President
                               Facsimile Number:  (212) 324-5050


         with a copy to:       Consolidated Edison, Inc.
                               4 Irving Place, Room 1800
                               New York, NY  10003
                               Attention:  Senior Vice President and
                                           General Counsel
                               Facsimile Number:  (212) 324-5001

or at such  other  addresses  as may have been  furnished  in  writing by CEC or
Exelon to the Company.

         Any party may give any notice, request,  consent or other communication
under this  Agreement  using any other  means  (including,  without  limitation,
personal delivery,  messenger service,  telecopy, first class mail or electronic
mail),  but no such notice,  request,  consent or other  communication  shall be
deemed to have been duly given  unless and until it is actually  received by the
party for whom it is  intended.  Any  party  may  change  the  address  to which
notices,  requests,  consents  or  other  communications  hereunder  are  to  be
delivered  by giving  the other  parties  notice in the manner set forth in this
Section.

         (5) Complete Agreement. This Agreement constitutes the entire agreement
and  understanding  of the  parties  hereto with  respect to the subject  matter
hereof and supersedes all prior agreements and  understandings  relating to such
subject matter.

         (6) Amendments  and Waivers.  Any term of this Agreement may be amended
or terminated  and the  observance  of any term of this  Agreement may be waived
(either  generally  or in a  particular  instance  and either  retroactively  or
prospectively),  with the  written  consent of the Company and the holders of at
least 51% of the Registrable  Shares held by all of the Stockholders;  provided,
that this  Agreement may be amended with the consent of the holders of less than
all Registrable Shares only in a manner which applies to all such holders in the
same fashion.  Any such amendment,  termination or waiver effected in accordance
with this Section 4(f) shall be binding on all parties  hereto,  even if they do
not execute such consent. No waivers of or exceptions to any term,  condition or
provision of this Agreement,  in any one or more  instances,  shall be deemed to
be, or construed as, a further or continuing waiver of any such term,  condition
or provision.

         (7)  Pronouns.  Whenever the context may require,  any pronouns used in
this Agreement  shall include the  corresponding  masculine,  feminine or neuter
forms, and the singular form of nouns and pronouns shall include the plural, and
vice versa.

         (8) Counterparts;  Facsimile Signatures. This Agreement may be executed
in any number of counterparts,  each of which shall be deemed to be an original,
and all of which  together  shall  constitute  one and the same  document.  This
Agreement may be executed by facsimile signatures.

         (9) Section  Headings.  The section headings are for the convenience of
the  parties  and  in no  way  alter,  modify,  amend,  limit  or  restrict  the
contractual obligations of the parties.




<PAGE>



              [the remainder of this page intentionally left blank]



<PAGE>



                  Executed as of the date first written above.


                        NEON COMMUNICATIONS, INC.



                        By:               /s/ Victor Colantonio
                           ----------------------------------------------------

                        Name:             Victor Colantonio
                             --------------------------------------------------

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


                        CONSOLIDATED EDISON COMMUNICATIONS, INC.



                        By:               /s/ John F. Pinto
                           ----------------------------------------------------

                        Name:             John F. Pinto
                             --------------------------------------------------

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


                        EXELON VENTURES CORP.



                        By:               /s/ Gregory A. Cucchi
                           ----------------------------------------------------

                        Name:             Gregory A. Cucchi
                             --------------------------------------------------

                        Title:            Chairman and Chief Executive Officer
                              -------------------------------------------------








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