Document:

<PAGE>

                                                                 Exhibit 10.12.2

***PORTIONS OF THIS EXHIBIT MARKED BY BRACKETS ("[***]") OR OTHERWISE INDICATED
HAVE BEEN OMITTED PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT. THE OMITTED
PORTIONS HAVE BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION.***

                                                       Agreement No. ITC2000NPPA
                                            Data and Internet Product Attachment
                                                           Exhibit K, Schedule D
                                                                     Page 1 of 2

                                   SCHEDULE D
                           DATA AND INTERNET PRODUCTS
              ETHERNET PORT COMMITMENT AND SERVICES PAYMENT PROGRAM

1.0  Description- As part of the Commitment Amount, IFN's e/\deltacom division
     commits to purchase [***]([***]) Ethernet ports listed in Schedule A, Part
     [***] of Exhibit K ("[***] Commitment") during the Commitment Period;
     provided, however, if e/\deltacom fails to achieve the Ethernet port
     Commitment, Buyer shall have no further obligation or liability with
     respect to the Ethernet Port Commitment except as provided in Section 3.6
     of this Schedule and as Buyer may otherwise be obligated under the General
     Terms and Conditions for failure to achieve the Commitment Amount.

2.0  Ethernet port Pricing- The pricing for the [***] Ethernet ports is
     specified in Schedule A, Part [***] of Exhibit K of the Agreement and
     subject to the discount schedule in Exhibit G-1. However, for the first
     [***]([***]) ports ordered, such [***] Ethernet ports will be discounted at
     [***] percent ([***]%) from List Price provided in Schedule A, Part [***]
     of Exhibit K.

3.0  Services Payment Program

     3.1 In consideration of the above Ethernet port Commitment, Nortel Networks
     shall offer e/\deltacom the option to purchase Services on a pay as you
     order ports program, ("Services Payment Program") up to [***] dollars
     ($[***]) in Services. e/\deltacom shall not be required to purchase any
     amount of Services, but to the extent it does purchase Services, amounts
     due and owing for such Services may be paid pursuant to the Services
     Payment Program.

     3.2 The Services and applicable prices provided under this Services Payment
     Program shall be set forth in one or more Statements of Work ("SOW")
     attached to Exhibit P and performed on a mutually agreed to schedule as
     provided in the SOW. Prior to becoming a part of and attached to this
     Agreement, each SOW shall be agreed upon and signed by e/\deltacom and
     Nortel Networks.

     3.3 If e/\deltacom elects to purchase Services under this Services Payment
     Program, e/\deltacom will accept such SOW and issue Orders for the Services
     under Exhibit P referencing this Services Payment Program, Schedule D.

     3.4 A portion of the amount due and owing by e/\deltacom with respect to
     the Services at the time one or more ports are Ordered, shall be invoiced
     concurrently along with the invoice for the Ethernet ports. Initially, for
     each Ethernet port ordered Nortel Networks shall invoice in the amount of
     [***] dollars ($[***]) to recover the cost for the Services purchased under
     the Services Payment Program until the Services are paid in full under this
     Services Payment Program. Issuance and payment of

                    CONFIDENTIAL AND PROPRIETARY INFORMATION

                     ***CONFIDENTIAL TREATMENT REQUESTED***

<PAGE>

                                                       Agreement No. ITC2000NPPA
                                            Data and Internet Product Attachment
                                                           Exhibit K, Schedule D
                                                                     Page 2 of 2

     invoices for the [***]and Services Payment Program will be pursuant to
     Article 6, Terms of Payment, of the General Terms & Conditions.

     3.5  Product Credits may not be used for the payment under this Services
     Payment Program for the Ethernet ports or Services.

     3.6  If the Agreement terminates pursuant to its terms or expires, and
     e/\deltacom has ordered Services under the Services Payment Program, Nortel
     Networks shall immediately invoice e/\deltacom for any remaining unpaid
     Services and such invoice shall be paid pursuant to Article 6, Terms of
     Payment, of the General Terms & Conditions.

     3.7  In the event e/\deltacom notifies Nortel Networks in writing that
     e.deltacom does not desire to purchase any further Services under the
     Services Payment Program, then any Services ordered after such notice shall
     be invoiced and paid pursuant to Article 6 of the General Terms &
     Conditions. Should e/\deltacom purchase Services in excess of the Services
     Payment Program, then payment for such additional Services shall be made
     pursuant to Article 6, Terms of Payment, of the General Terms and
     Conditions.

4.0  Service Billing Audit - Nortel Networks and e/\deltacom shall conduct a
     quarterly review of the Services Ordered under the Services Payment Program
     to determine if a change in the Services Payment Program charge on an
     invoice as referenced in 3.4 above is needed. Such audits shall be
     conducted at a mutually agreed upon time.

NORTEL NETWORKS INC.                        INTERSTATE FIBERNET, INC.

By:      /s/ Colin S. Doherty               By:     /s/ David L. Hill
   ---------------------------------           --------------------------------

Name:    Colin S. Doherty                   Name:   David L. Hill
     -------------------------------             -------------------------------

Title:   RVP S.E. Region                    Title:  VP Engineering and Planning
      ------------------------------              ------------------------------

 Date:   3/30/01                            Date:   3/27/01
      ------------------------------              ------------------------------

ITC/\DELTACOM COMMUNICATIONS INC.

By:      /s/ David L. Hill
   ---------------------------------
Name:    David L. Hill
     -------------------------------

Title:   VP Engineering and Planning
      ------------------------------

Date:    3/27/01
     -------------------------------

                    CONFIDENTIAL AND PROPRIETARY INFORMATION

                     ***CONFIDENTIAL TREATMENT REQUESTED***<PAGE>

                                                                 EXHIBIT 10.23.3

                             AMENDMENT NO. 2 TO THE
                                CREDIT AGREEMENT

                                                        Dated as of June 1, 2001

                  AMENDMENT NO. 2 TO THE CREDIT AGREEMENT among ITC/\DeltaCom,
Inc., a Delaware corporation (the "Parent"), Interstate FiberNet, Inc., a
                                   ------
Delaware corporation (the "Borrower"), ITC/\Deltacom Communications, Inc., an
                           --------
Alabama corporation, DeltaCom Information Systems, Inc., an Alabama corporation
(collectively, the "Subsidiary Guarantors"), the banks, financial institutions
                    ---------------------
and other institutional lenders parties to the Credit Agreement referred to
below (collectively, the "Lenders") and Morgan Stanley Senior Funding, Inc., as
                          -------
administrative agent (the "Administrative Agent") for the Lenders.
                           --------------------

                  PRELIMINARY STATEMENTS:

                  (1) The Borrower, the Parent, the Subsidiary Guarantors, the
Lenders and the Administrative Agent have entered into a Credit Agreement dated
as of April 5, 2000 (as amended, supplemented or otherwise modified through the
date hereof, the "Credit Agreement"). Capitalized terms not otherwise defined in
this Amendment have the same meanings as specified in the Credit Agreement.

                  (2) The Borrower, the Parent, the Subsidiary Guarantors and
the Required Lenders have agreed to amend the Credit Agreement as hereinafter
set forth.

                  (3) The Required Lenders are, on the terms and conditions
stated below, willing to grant the request of the Borrower and the Borrower, the
Parent, the Subsidiary Guarantors and the Required Lenders have agreed to amend
the Credit Agreement as hereinafter set forth.

                  SECTION 1. Amendments to Credit Agreement.  The Credit
                             ------------------------------
Agreement is, effective as of the date hereof and subject to the satisfaction of
the conditions precedent set forth in Section 2, hereby amended as follows:

                  (a)  Section 1.01 is amended to add the following definitions:

                       "Investment Agreement" means the Investment Agreement,
         dated as of February 27, 2001 and amended as of May 29, 2001, as the
         amended from time to time in accordance with its terms, among Parent,
         ITC Holding Company, Inc., SCANA Corporation and HBK Master Fund L.P.

                       "PIK Dividends" means the shares of Series B Preferred
         Stock paid or payable as dividends on shares of Series B Preferred
         Stock in accordance with the applicable certificate of designation with
         respect thereto.

                       "Series B Preferred Stock" means the shares of any series
         of the Parent's cumulative convertible preferred stock which is
         designated as "Series B-__ Cumulative Convertible Preferred Stock" and
         issued pursuant to the Investment Agreement and the

<PAGE>

         certificate of designation for such series of cumulative convertible
         preferred stock, including, without limitation, PIK Dividends.

                  (b) The second paragraph of Section 5.02(b) is amended by
         deleting the word "and" where it appears immediately before clause
         (vii) and inserting the following immediately after clause (vii):

                     "; and

                       (viii) with respect to the Parent, the Series B Preferred
 Stock."

                  SECTION 2. Conditions of Effectiveness. This Amendment shall
                             ---------------------------
become effective as of the date first above written when, and only when, the
Administrative Agent shall have received counterparts of this Amendment executed
by the Borrower, the Parent, the Subsidiary Guarantors and the Required Lenders
or, as to any of the Lenders, advice satisfactory to the Administrative Agent
that such Lender has executed this Amendment. This Amendment is subject to the
provisions of Section 9.01 of the Credit Agreement.

                  SECTION 3. Representations and Warranties of the Borrower. The
                             ----------------------------------------------
Borrower represents and warrants that:

                       (a) the representations and warranties contained in each
         Loan Document are correct in all material respects on and as of the
         date hereof, before and after giving effect to this Amendment, other
         than any such representations and warranties that, by their terms,
         refer to a specific date other than the date hereof, in which case as
         of such specific date; and

                  (b) no Default has occurred and is continuing, or would result
from this Amendment.

                  SECTION 4. Consent of the Borrower, the Parent and the
                             -------------------------------------------
Subsidiary Guarantors. The Parent and the Subsidiary Guarantors, as Guarantors
---------------------
under the Credit Agreement, and the Borrower, the Parent and the Subsidiary
Guarantors, as Grantors under the Security Agreement, hereby consent to this
Amendment and hereby confirm and agree that (a) they have received a copy of and
reviewed to their satisfaction this Amendment, (b) notwithstanding the
effectiveness of this Amendment, each of the Guaranties, the Security Agreement
and the other Loan Documents are, and shall continue to be, in full force and
effect and are hereby ratified and confirmed in all respects, except that, on
and after the effectiveness of this Amendment, each reference in the Loan
Documents to the "Credit Agreement," "thereunder," "thereof," or words of like
import shall mean and be a reference to the Credit Agreement, as amended by this
Amendment, and (c) the Loan Documents to which the Borrower, the Parent or any
Subsidiary Guarantor is a party and all of the Collateral described therein do,
and shall continue to, secure the payment of all of the Secured Obligations.

                  SECTION 5. Reference to and Effect on the Credit. (a) On and
                             -------------------------------------
after the effectiveness of this Amendment, each reference in the Credit
Agreement to "this Agreement," "hereunder," "hereof," or words of like import
referring to the Credit Agreement, and each reference in the Notes to "the
Credit Agreement," "thereunder," "thereof," or words of like

                                       2

<PAGE>

import referring to the Credit Agreement, shall mean and be a reference to the
Credit Agreement, as amended by this Amendment.

                  (b) The Credit Agreement and the other Loan Documents as
         specifically amended by this Amendment are and shall continue to be in
         full force and effect and are hereby in all respects ratified and
         confirmed.

                  (c) The execution, delivery and effectiveness of this
         Amendment shall not, except as expressly provided herein, operate as a
         waiver of any right, power or remedy of any Lender or the
         Administrative Agent under any of the Loan Documents, nor constitute a
         waiver of any provision of any of the Loan Documents.

                  SECTION 6. Costs; Expenses. The Borrower agrees to pay on
                             ---------------
demand all costs and expenses of the Administrative Agent in connection with the
preparation, execution, delivery and administration, modification and amendment
of this Amendment and the other instruments and documents to be delivered
hereunder (including, without limitation, the reasonable fees and expenses of
counsel for the Administrative Agent) in accordance with the terms of Section
9.04 of the Credit Agreement.

                  SECTION 7. Execution in Counterparts. This Amendment may be
                             -------------------------
executed in any number of counterparts and by different parties hereto in
separate counterparts, each of which when so executed shall be deemed to be an
original and all of which taken together shall constitute but one and the same
agreement. Delivery of an executed counterpart of a signature page to this
Amendment by telecopier shall be effective as delivery of a manually executed
counterpart of this Amendment.

                  SECTION 8. Governing Law. This Amendment shall be governed by,
                             -------------
and construed in accordance with, the laws of the State of New York.

                                       3

<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be executed by their respective officers thereunto duly authorized,
as of the date first above written.

                                          ITC/\DELTACOM, INC.

                                          By:     /s/  Douglas A. Shumate
                                               ---------------------------------
                                               Title:  Senior Vice President-CFO

                                          INTERSTATE FIBERNET, INC.

                                          By:     /s/  Douglas A. Shumate
                                               ---------------------------------
                                               Title:  Senior Vice President-CFO

                                          ITC/\DELTACOM COMMUNICATIONS, INC.

                                          By:     /s/  Douglas A. Shumate
                                               ---------------------------------
                                               Title:  Senior Vice President-CFO

                                          DELTACOM INFORMATION SYSTEMS, INC.

                                          By:     /s/  Douglas A. Shumate
                                               ---------------------------------
                                               Title:  Senior Vice President-CFO

                                       4

<PAGE>

                                          MORGAN STANLEY SENIOR FUNDING, INC.,
                                          as Administrative Agent and as Lender

                                          By:     /s/  Lucy K. Galbraith
                                               ---------------------------------
                                               Title:  Managing Director

                                          MORGAN STANLEY & CO. INCORPORATED,
                                          as Collateral Agent

                                          By:     /s/  Lucy K. Galbraith
                                               ---------------------------------
                                               Title:  Managing Director

                                       5

<PAGE>

                                          As Lenders
                                          ----------

                                          Lender:  Suffield CLO, Ltd.
                                          By:      D.L. Bobson & Co. Inc. as
                                                   Collateral Manager

                                          By:   /s/  Steven J. Katz
                                               ---------------------------------
                                          Title:  Counsel

<PAGE>

                                          As Lenders
                                          ----------

                                          Lender:  Fidelity and Guaranty Life
                                          By:      Dwight Asset Management

                                          By:   /s/  Edward S. Meiss
                                               ---------------------------------
                                          Title:  Senior Vice President

<PAGE>

                                          As Lenders
                                          ----------

                                          Lender:  Maplewood (Cayman) Limited
                                          By:      Massachusetts Mutual Life
                                                   Insurance Company,
                                                   as Investment Manager

                                          By:   /s/  Steven J. Katz
                                               ---------------------------------
                                          Title:  Second Vice President

<PAGE>

                                          As Lenders
                                          ----------

                                          Lender:  P W Willows Fund L.L.C.
                                          By:      Bond Street Capital, L.L.C.,
                                                   its advisor

                                          By:   /s/  Sam S. Kim
                                               ---------------------------------
                                          Title:  Managing Member

<PAGE>

                                          As Lenders
                                          ----------

                                          Lender:  Excel Bank

                                          By:   /s/
                                               ---------------------------------
                                          Title:  Vice President

<PAGE>

                                          As Lenders
                                          ----------

                                          Lender:  IBM Credit Corporation

                                          By:   /s/
                                               ---------------------------------
                                          Title:  Manager of Credit

<PAGE>

                                          As Lenders
                                          ----------

                                          Lender:  ELC (Cayman) Ltd. 2000-1

                                          By:   /s/
                                               ---------------------------------
                                          Title:  Director

<PAGE>

                                          As Lenders
                                          ----------

                                          Lender:  TRYON CLO Ltd. 2000-1

                                          By:   /s/
                                               ---------------------------------
                                          Title:  Director

<PAGE>

                                          As Lenders
                                          ----------

                                          Lender:  Bank of America, NA

                                          By:   /s/
                                               ---------------------------------
                                          Title:  AVP

<PAGE>

                                          As Lenders
                                          ----------

                                          Lender:  Sankaty High Yield Partners
                                                   II, L.P.

                                          By:   /s/  Diane J. Exter
                                               ---------------------------------
                                          Title:  Managing Director
                                                  Portfolio Manager

<PAGE>

                                          As Lenders
                                          ----------

                                          Lender:  Sankaty High Yield Partners
                                                   III, L.P.

                                          By:   /s/  Diane J. Exter
                                               ---------------------------------
                                          Title:  Managing Director
                                                  Portfolio Manager

<PAGE>

                                    As Lenders
                                    ----------

                                    Lender:  Sankaty Advisors, LLC as Collateral
                                             Manager for Great Point CLO 1999-1
                                             Ltd. as Term Lender

                                    By:     /s/  Diane J. Exter
                                          --------------------------------------
                                    Title:  Managing Director
                                            Portfolio Manager

<PAGE>

                                  As Lenders
                                  ----------

                                  Lender:  Sankaty Advisors, LLC as Collateral
                                           Manager for Great Point II CBO 2000-1
                                           Ltd. as Term Lender

                                  By:      /s/  Diane J. Exter
                                         ---------------------------------------
                                  Title:  Managing Director
                                          Portfolio Manager

<PAGE>

                                  As Lenders
                                  ----------

                                  Lender:    PACIFICA PARTNERS I, L.P.
                                  By:        Imperial Credit Asset Management
                                             as its Investment Advisor

                                  By:     /s/  Tom Calwell
                                        ----------------------------------------
                                  Title:  Vice President

<PAGE>

                                  As Lenders
                                  ----------

                                  Lender:    Webster Bank

                                  By:     /s/  Elisabeth V. Piker
                                        ----------------------------------------
                                  Title:  Vice President

<PAGE>

                                  As Lenders
                                  ----------

                                  Lender:    WESTPAC BANKING CORPORATION

                                  By:    /s/   Lance Vassarotti
                                       -----------------------------------------
                                  Title:  Vice President

<PAGE>

                                  As Lenders
                                  ----------

                                  Lender:    PROMETHEUS INVESTMENT
                                             FUNDING NO. 1 LTD.
                                  By:        CPF Asset Advisory, L.L.C., as
                                             Investment Manager

                                  By:     /s/  Thomas L. Mowat
                                        ----------------------------------------
                                  Title:  Associate Director

                                  By:     /s/  Elizabeth H. Talimadge
                                        ----------------------------------------
                                  Title:  Managing Director
                                          Chief Investment Officer

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