Document:

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                                                                    Exhibit 10.3

                               FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT

      THIS FOURTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT (this
"Agreement"), dated as of November 20, 2001, is by and among NATG HOLDINGS, LLC,
a Delaware limited liability company ("NATG" or the "Borrower"), ORIUS CORP., a
Florida corporation ("Holdings"), the financial institutions party to the Credit
Agreement (as defined below), in their capacities as lenders (collectively, the
"Lenders," and each individually, a "Lender"), and Bankers Trust Company, as
administrative agent (the "Agent") for the Lenders.

                              W I T N E S S E T H :

      WHEREAS, the Borrower, Holdings, the Lenders and the Agent are parties to
that certain Amended and Restated Credit Agreement dated as of July 5, 2000 (as
heretofore and hereafter amended, restated, supplemented or otherwise modified
and in effect from time to time, the "Credit Agreement"), pursuant to which the
Lenders have provided to the Borrower credit facilities and other financial
accommodations;

      NOW, THEREFORE, in consideration of the premises and of the mutual
covenants contained herein, and other good and valuable consideration the
receipt and adequacy of which are hereby acknowledged, the parties hereto hereby
agree as follows:

      1.    Defined Terms. Terms capitalized herein and not otherwise defined
herein are used with the meanings ascribed to such terms in the Credit
Agreement.

      2.    Amendments to Credit Agreement. The Credit Agreement is, as of the
Effective Date (as defined below), hereby amended as follows:

            (a)   Section 1.1 of the Credit Agreement is amended by inserting
the following new definitions in the appropriate alphabetical order:

            "Borrower Request" shall have the meaning provided in the Equity
      Call Agreement.

            "Capital Infusion" shall have the meaning provided in the Equity
      Call Agreement.

            "Capital Infusion Availability Ratio" means, on any date of
      determination, the ratio of (i) the aggregate amount of the proposed
      Capital Infusion to be requested on such date to (ii) the Maximum Infusion
      Balance on such date prior to giving effect to such Capital Infusion.

            "Equity Call Notice" shall have the meaning provided in the Equity
      Call Agreement.
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            "Equity Investors" shall have the meaning provided in the Equity
      Call Agreement.

            "Fourth Amendment" means that certain Fourth Amendment to Amended
      and Restated Credit Agreement dated as of November 20, 2001 by and among
      Borrower, Holdings, Agent and the Lenders.

            "Fourth Amendment Effective Date" means the "Effective Date" as
      defined in the Fourth Amendment.

            "Maximum Infusion Amount" shall have the meaning provided in the
      Equity Call Agreement.

            "Maximum Infusion Balance" shall have the meaning provided in the
      Equity Call Agreement.

            "Revolving Loan Availability Ratio" means, on any date of
      determination, the ratio of (i) the aggregate principal amount of the
      proposed Loan or the Stated Amount of the proposed Letter of Credit to be
      requested on such date to (ii) the Total Available Revolving Commitment
      prior to giving effect to such Loan or Letter of Credit.

            "Trigger Date" means the earliest to occur of (i) the date on which
      any Unmatured Event of Default or Event of Default occurs after the Fourth
      Amendment Effective Date, (ii) the date on which the Total Available
      Revolving Commitment (after giving effect to any Loans or Letters of
      Credit requested to be made or issued on such date) is less than
      $19,000,000 and (iii) the date on which any Working Capital Loan made on
      or after the Fourth Amendment Effective Date (excluding any such Working
      Capital Loan that is made if, immediately after giving effect to the
      funding thereof, the Total Available Revolving Commitment is equal to or
      greater than $22,000,000) has remained outstanding in whole or in part for
      fifteen (15) Business Days.

            "Trigger Event" shall have the meaning provided in the Equity Call
      Agreement.

            (b)   Section 2.1(c) of the Credit Agreement is amended by inserting
a new sentence at the conclusion thereof to read as follows:

      Notwithstanding anything to the contrary in the foregoing paragraph, Swing
      Line Lender shall not make, and Borrower shall not request, any Swing Line
      Loans on or after the Fourth Amendment Effective Date.

            (c)   Section 4.4 of the Credit Agreement is amended by inserting
new clauses (i) and (j) at the conclusion thereof to read as follows:

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            (i)   Mandatory Prepayment Upon Trigger Event. Within twelve (12)
      Business Days following delivery to the Equity Investors of an Equity Call
      Notice pursuant to a Trigger Event resulting from clause (i) of the
      definition of Trigger Date in accordance with the Equity Call Agreement,
      an amount equal to 100% of the Capital Infusion requested in such Equity
      Call Notice shall be applied as a mandatory repayment of principal of
      Working Capital Loans (notwithstanding anything to the contrary regarding
      the application of such prepayment in Section 4.5(a)) and, within the
      Working Capital Loans, first to the payment of Base Rate Loans and second
      to the payment of Eurodollar Loans, in such order as Borrower shall
      request (and in the absence of such request, as Agent shall determine so
      as to minimize, if possible, any amounts due under Section 3.5).

            (j)   Mandatory Prepayment With Excess Available Cash. Borrower
      shall on each Monday (or the next succeeding Business Day if Monday is not
      a Business Day) (i) deliver a certificate of a Responsible Officer
      certifying as to the average daily aggregate amount of Cash and Cash
      Equivalents calculated for the prior week (using the aggregate amount of
      Cash and Cash Equivalents as of the end of each Business Day in the prior
      week) (such amount being referred to herein as the "Average Cash Amount")
      and (ii) make a mandatory repayment in an amount (if positive) equal to
      the Average Cash Amount minus $23,000,000, such repayment applied first as
      a mandatory repayment of principal of Working Capital Loans, second for
      cash collateralization of LC Obligations and third for deposit in the Cash
      Collateral Account (as defined in the Security Agreement) (notwithstanding
      anything to the contrary regarding the application of such prepayment in
      Section 4.5(a)) and, within the Working Capital Loans, first to the
      payment of Base Rate Loans and second to the payment of Eurodollar Loans,
      in such order as Borrower shall request (and in the absence of such
      request, as Agent shall determine so as to minimize, if possible, any
      amounts due under Section 3.5). Borrower, Agent and Lenders acknowledge
      and agree that the amount of Cash and Cash Equivalents shall exclude the
      Excess Income Tax Refund (as defined in Section 4(h) of the Fourth
      Amendment), to the extent included therein.

            (d)   Section 5.2 of the Credit Agreement is amended by inserting
new clauses (f), (g) and (h) immediately following clause (e) thereof to read as
follows:

            (f)   Equity Call. Prior to the making of each Loan and the issuance
      of each Letter of Credit on and after the Trigger Date and prior to the
      date that the Maximum Infusion Amount has been fully invested by the
      Equity Investors in accordance with the Equity Call Agreement, Agent shall
      have received a copy of an Equity Call Notice that has been delivered to
      the Equity Investors in accordance with clause (ii) of the first sentence
      appearing in Section 2 of the Equity Call Agreement, which Equity Call
      Notice shall constitute a Borrower Request for a Capital Infusion in an
      amount necessary for the Revolving Loan Availability Ratio and the Capital
      Infusion Availability Ratio to be equaled as nearly as possible (subject
      to rounding) with respect to such requested Loan or

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      Letter of Credit; provided, however, that the Equity Call Notice required
      to be delivered with the first Loan or Letter of Credit requested to be
      made or issued on or after the Trigger Date will be required to provide
      for a Capital Infusion in an amount necessary for the Revolving Loan
      Availability Ratio and the Capital Infusion Availability Ratio to be
      equalized as nearly as possible (subject to rounding) with respect to such
      requested Loan or Letter of Credit treating all Loans and Letters of
      Credit made or issued on or after the Fourth Amendment Effective Date that
      remain outstanding on the Trigger Date as having been requested, and all
      fully invested Capital Infusions pursuant to clause (vi) of the first
      sentence appearing in Section 2 of the Equity Call Agreement as having
      been made, on such date rather than on dates actually requested or made
      for purposes of determining the Revolving Loan Availability Ratio and
      Capital Infusion Availability Ratio.

            (g)   Trigger Date Calculation. At any time prior to the making of
      each Loan and the issuance of each Letter of Credit before the Trigger
      Date, Agent shall have received a certificate executed by a Responsible
      Officer of the Borrower setting forth the date of funding and amount of
      each Working Capital Loan made on or after the Fourth Amendment Effective
      Date and the date and amount of each repayment thereof, and any other
      calculations or information necessary to establish to the reasonable
      satisfaction of Agent that the Trigger Date has not occurred.

            (h)   Maximum Available Cash. Prior to the making of each Loan and
      the issuance of each Letter of Credit, Agent shall have received a
      certificate executed by a Responsible Officer of Borrower (i) setting
      forth the date of funding or issuance, (ii) certifying as to the aggregate
      amount of Cash and Cash Equivalents of Holdings and its Subsidiaries on
      the date of such funding or issuance after giving effect to such funding
      or issuance and after giving effect to any Capital Infusion required to be
      requested due to such funding, if any, (such amount calculated in
      accordance with this clause (ii) being referred to herein as "Available
      Cash") and (iii) certifying that Available Cash as of the date of funding
      or issuance is not greater than $15,000,000; provided, that,
      notwithstanding the foregoing, with respect to a request for the issuance
      of a Letter of Credit, Available Cash may exceed $15,000,000 if,
      contemporaneously with the request for issuance or the issuance of such
      Letter of Credit, Borrower repays Working Capital Loans and/or reduces the
      aggregate Stated Amount of the then outstanding Letters of Credit in an
      amount equal to the Stated Amount of such Letter of Credit (it being
      understood that the notice and minimum amount/increment requirements of
      Section 4.3(a) shall not apply to such prepayment).

            (e)   Section 5.2 of the Credit Agreement is further amended by
deleting the last sentence appearing in such Section in its entirety and
substituting the following therefor:

            The acceptance of the benefits of each such Credit Event by Borrower
      shall be deemed to constitute a representation and warranty by them to the
      effect

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      of paragraphs (a), (b), (c), (d), (f), (g) and (h) of this Section 5.2
      (except that no opinion need be expressed as to the Agent's or Required
      Lenders' satisfaction with any documents, instrument or other matter).

            (f)   Section 6.5(b) of the Credit Agreement is amended by deleting
the phrase "On and as of the Restatement Date, after" appearing in the first
line thereof and substituting "After" therefor.

            (g)   Section 6.11(c) of the Credit Agreement is amended by deleting
the phrase "on the Restatement Date" in the second sentence thereof and
inserting in lieu thereof the phrase "on the Fourth Amendment Effective Date".

            (h)   Section 6.14 of the Credit Agreement is amended by deleting
the phrase "As of the Restatement Date" in the second and third sentence thereof
and inserting in lieu thereof the phrase "As of the Fourth Amendment Effective
Date".

            (i)   Section 6.15(b) of the Credit Agreement is amended by deleting
the phrase "as of the Restatement Date" in the first sentence thereof and
inserting in lieu thereof the phrase "as of the Fourth Amendment Effective
Date".

            (j)   Article VI of the Credit Agreement is further amended by
inserting a new Section 6.25 at the conclusion thereof to read as follows:

            Section 6.25 Bonding Agreements. As of November 15, 2001, Schedule
      6.25 hereto sets forth all outstanding bonding arrangements to which any
      Credit Party is party and includes a description of each bond issued for
      the benefit of any Credit Party, the amount and term of such bond and the
      project to which such bond relates.

            (k)   Article VII of the Credit Agreement is amended by inserting
new Sections 7.19 and 7.20 at the conclusion thereof to read as follows:

            Section 7.19 Trigger Event Equity Call Notice. On any Trigger Date
      pursuant to clause (i) or (iii) of the definition thereof, Borrower shall
      deliver an Equity Call Notice to the Equity Investors in accordance with
      Section 2 of the Equity Call Agreement.

            Section 7.20 Financial Advisor; Budget and Projections. As soon as
      possible and in any event no later than December 20, 2001, Borrower shall
      (i) retain a financial advisor to assist Holdings and its Subsidiaries in
      formulating a financial restructuring plan for Holdings and its
      Subsidiaries and (ii) deliver to Agent and Lenders an annual budget and
      projections for the 2002 fiscal year meeting the requirements set forth in
      Section 7.1(e) and also including a plan for restructuring the debt and
      equity of Holdings and its Subsidiaries.

            (l)   Article VIII of the Credit Agreement is amended by inserting
new Sections 8.19 and 8.20 at the conclusion thereof to read as follows:

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            Section 8.19 Deposit Accounts. Holdings will not, and will not
      permit any other Credit Party to, open or establish any Deposit Account
      (as defined in the Uniform Commercial Code as in effect from time to time
      in the State of New York) after the Fourth Amendment Effective Date unless
      it shall have given to Agent prior written notice of its intention to do
      so, accompanied with an updated Schedule I to the Fourth Amendment which
      reflects all such Deposit Accounts of the Credit Parties at such time
      (including any such new Deposit Accounts).

            Section 8.20 Working Capital and Capital Expenditure Practices.
      Holdings will not, and will not permit any of its Subsidiaries to, (i) in
      any material respect manage its working capital, (ii) prepay any accounts
      payable or other liabilities (other than the Obligations) which
      individually or in the aggregate would be material or (iii) prepay or
      accelerate any Capital Expenditures which individually or in the aggregate
      would be material, in each case other than in the ordinary course of
      business consistent with past practices.

            (m)   Section 10.1(a) of the Credit Agreement is amended by deleting
such Section in its entirety and substituting the following therefor:

            (a)   Failure to Make Payments When Due. Borrower (i) shall default
      in the payment of principal on any of the Loans or any reimbursement
      obligation with respect to any Letter of Credit (it being understood and
      agreed that the failure to make a mandatory prepayment pursuant to Section
      4.4(i) in an amount equal to 100% of the Capital Infusion requested
      pursuant to an Equity Call Notice due to a Trigger Event within twelve
      (12) Business Days following delivery to the Equity Investors of such
      Equity Call Notice, regardless of whether Holdings or Borrower actually
      receive such Capital Infusion, as a result of a default in the payment by
      any Equity Investors under the Equity Call Agreement or otherwise, shall
      constitute a default in the payment of principal on the Loans as specified
      in this Section 10.1(a)(i)); or (ii) shall default in the payment of
      interest on any of the Loans or default in the payment of any fee or any
      other amount owing hereunder or under any other Loan Document when due and
      such default in payment shall continue for three (3) Business Days; or

            (n)   Section 10.1(c) of the Credit Agreement is amended by deleting
such Section in its entirety and substituting the following therefor:

            (c)   Covenants. Holdings or Borrower shall (i) default in the
      performance or observance of any term, covenant, condition or agreement on
      its part to be performed or observed under Section 7.19, Article VIII or
      Article IX hereof, (ii) default in the performance or observance of any
      term, covenant, condition or agreement on its part to be performed or
      observed under Sections 7.3, 7.6, 7.8, 7.9, 7.10, 7.12 or 7.17 and such
      default shall remain unremedied for a period of five (5) Business Days or
      (iii) default in the due performance or observance by it of any other
      term, covenant or agreement contained in this Agreement and such default
      shall continue unremedied for a period of thirty (30) days after written
      notice to Borrower by Agent or any Lender; or

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            (o)   Section 12.4(a) of the Credit Agreement is amended by
inserting the following sentence immediately after the first sentence thereof
and immediately prior to the current second sentence thereof:

            Borrower also agrees to pay promptly upon request by Agent all costs
      and expenses of Agent and Lenders in connection with the retention by
      Agent and Lenders of a financial advisor to assist Agent and Lenders with
      their analysis of the financial restructuring of Holdings and its
      Subsidiaries, including without limitation, the fees and out-of-pocket
      expenses of such financial advisor.

            (p)   The Credit Agreement is amended by amending and restating
Schedules 6.11(c), 6.14 and 6.15 to read as set forth on Schedules 6.11(c), 6.14
and 6.15 attached hereto.

            (q)   The Credit Agreement is further amended by inserting a new
Schedule 6.25 to read as set forth on Schedule 6.25 attached hereto.

      3.    Temporary Waiver. From and after the Effective Date to but excluding
January 15, 2002 (such period the "Waiver Period"), the Agent and the Lenders
hereby (i) waive compliance with Sections 9.2, 9.3 and 9.4 of the Credit
Agreement for the Test Periods ending September 30, 2001 and December 31, 2001
and (ii) waive any Event of Default or Unmatured Event of Default resulting from
any breach of the representation and warranty set forth in the last sentence of
Section 6.5(a) of the Credit Agreement based upon the financial statements of
Holdings delivered to the Lenders prior to the Effective Date for the months of
July, August and September 2001, the projections delivered to the Agent on
September 21, 2001 and other written information delivered to the Agent and
distributed by the Agent to the Lenders prior to the Effective Date, and agree
not to assert a failure to satisfy the condition precedent set forth in Section
5.2(d) of the Credit Agreement in connection with any Credit Event after the
date of this Agreement based on such financial statements, projections and
written information identified or described above. Notwithstanding anything
herein to the contrary, Holdings and Borrower expressly acknowledge and agree
that the Agent and the Lenders may exercise any and all rights and remedies
under the Credit Agreement and the other Loan Documents and under applicable law
at any time on or after the earlier to occur of (i) the occurrence of any
Unmatured Event of Default or Event of Default (except as expressly waived above
in this Section 3 during the Waiver Period) after the Effective Date and (ii)
January 15, 2001.

      4.    Representations and Warranties. In order to induce the Agent and the
Lenders to enter into this Agreement, each of the Borrower and Holdings hereby
represents and warrants to the Agent and the Lenders, in each case after giving
effect to this Agreement, as follows:

            (a)   Each of the Borrower and Holdings has the right, power and
capacity and has been duly authorized and empowered by all requisite corporate
or limited liability company and shareholder or member action to enter into,
execute, deliver and perform this Agreement and all agreements, documents and
instruments executed and delivered pursuant to this Agreement.

            (b)   This Agreement constitutes each of the Borrower's and
Holdings' legal, valid and binding obligation, enforceable against it, except as
enforcement thereof may be

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subject to the effect of any applicable bankruptcy, insolvency, reorganization,
moratorium or similar laws affecting creditors' rights generally and general
principles of equity (regardless of whether such enforcement is sought in a
proceeding in equity or at law or otherwise).

            (c)   The representations and warranties contained in the Credit
Agreement and the other Loan Documents are true and correct in all material
respects at and as of the Effective Date as though made on and as of the
Effective Date (except to the extent specifically made with regard to a
particular date, in which case such representation and warranty is true and
correct in all material respects as of such earlier date).

            (d)   Each of the Borrower's and Holdings' execution, delivery and
performance of this Agreement do not and will not violate its Articles or
Certificate of Incorporation, By-laws or other Organizational Documents, any
law, rule, regulation, order, writ, judgment, decree or award applicable to it
or any contractual provision to which it is a party or to which it or any of its
property is subject.

            (e)   No authorization or approval or other action by, and no notice
to or filing or registration with, any governmental authority or regulatory body
(other than those which have been obtained and are in force and effect) is
required in connection with the execution, delivery and performance by the
Borrower, Holdings or any other Credit Party of this Agreement and all
agreements, documents and instruments executed and delivered pursuant to this
Agreement.

            (f)   No Event of Default or Unmatured Event of Default exists under
the Credit Agreement.

            (g)   Schedule I attached hereto contains a true and complete list
of all Deposit Accounts (as defined in the Uniform Commercial Code as in effect
from time to time in the State of New York) maintained by any Credit Party as of
the date of this Agreement, which Schedule shall list for each account the
account party, the account number, the financial institution and the address and
contact party for such financial institution.

            (h)   The amount of the tax refund previously received by Borrower
from the IRS includes an excess refund in the amount of $4,150,099.85 (the
"Excess Income Tax Refund") which Borrower has undertaken to repay to the IRS.

      5.    Conditions to Effectiveness of Amendment. This Agreement shall
become effective as of September 29, 2001 (the "Effective Date") upon
satisfaction of the following conditions precedent:

            (a)   Execution and Delivery of Amendment. The Borrower, Holdings,
the Agent and the Required Lenders shall have executed and delivered this
Agreement.

            (b)   Execution and Delivery of Loan Documents. The Agent shall have
received each of the following documents, all of which shall be satisfactory in
form and substance to the Agent and its counsel:

            (1)   revised Schedules 6.11(c), 6.14, 6.15 and 6.25 to the Credit
Agreement;

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            (2)   an Amended and Restated Security Agreement in the form of
Exhibit A attached hereto, duly executed and delivered by each Credit Party;

            (3)   a Perfection Certificate in the form of Exhibit B attached
hereto, duly executed and delivered by each Credit Party;

            (4)   a signed opinion of Kirkland & Ellis, counsel for the Credit
Parties, as to such matters in connection with this Amendment and the other Loan
Documents executed and delivered pursuant to this Amendment as the Agent or its
counsel may reasonably request;

            (5)   a certificate of an officer of Holdings and the Borrower in
the form of Exhibit C attached hereto;

            (6)   a Reaffirmation of Guaranty in the form of Exhibit D attached
hereto, duly executed and delivered by Holdings and the Subsidiary Guarantors;

            (7)   a First Amendment to Equity Call Agreement in the form of
Exhibit E attached hereto, duly executed and delivered by Holdings, Borrower,
the Equity Investors and the Agent;

            (8)   the financial statements referenced in Section 7.1(a) of the
Credit Agreement for the Fiscal Quarter ended September 30, 2001; and

            (9)   a certificate of the chief financial officer of Holdings
substantially in the form of Exhibit 7.2(b) to the Credit Agreement (without
giving effect to this Agreement) stating that, to the best of such officer's
knowledge, (i) the financial statements referenced in clause (8) above present
fairly in all material respects, in accordance with GAAP, the financial
condition and results of operations of Holdings and its Subsidiaries for the
period referred to therein (subject, in the case of interim statements, to
normal year-end audit adjustments and the absence of footnote disclosure) and
(ii) after giving effect to this Agreement, no Event of Default or Unmatured
Event of Default has occurred, except as specified in such certificate and, if
so specified, the action which Borrower propose to take with respect thereto,
which certificate shall set forth detailed computations to the extent necessary
to establish Borrower's compliance or non-compliance with the covenants set
forth in Article IX of the Credit Agreement.

            (c)   No Defaults. After giving effect to this Agreement, no Event
of Default or Unmatured Event of Default under the Credit Agreement shall have
occurred and be continuing.

            (d)   Representations and Warranties. After giving effect to this
Agreement, the representations and warranties of the Borrower, Holdings and the
other Credit Parties contained in this Agreement, the Credit Agreement and the
other Loan Documents shall be true and correct in all material respects as of
the Effective Date, with the same effect as though made on such date, except to
the extent that any such representation or warranty relates to an earlier date,
in which case such representation or warranty shall be true and correct in all
material respects as of such earlier date.

            (e)   Fees. Borrower shall have paid all reasonable costs, fees and
expenses (including, without limitation, reasonable legal fees and expenses of
Winston & Strawn and the

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costs, fees and expenses referred to in Section 7(a) hereof and Section 12.4 of
the Agreement) of the Agent.

            (f)   Other Matters. Agent shall have received such other
instruments and documents as Agent or the Required Lenders may reasonably
request in connection with the execution of this Agreement, and all such
instruments and documents shall be reasonably satisfactory in form and substance
to Agent.

      6.    Consent of Required Lenders. The Required Lenders hereby consent to
the terms of the First Amendment to Equity Call Agreement in the form attached
hereto as Exhibit E.

      7.    Miscellaneous. The parties hereto hereby further agree as follows:

            (a)   Costs, Expenses and Taxes. The Borrower hereby agrees to pay
all reasonable fees, costs and expenses of the Agent incurred in connection with
the negotiation, preparation and execution of this Agreement and the
transactions contemplated hereby, including, without limitation, the reasonable
fees and expenses of Winston & Strawn, counsel to the Agent.

            (b)   Counterparts. This Agreement may be executed in one or more
counterparts, each of which, when executed and delivered, shall be deemed to be
an original and all of which counterparts, taken together, shall constitute but
one and the same document with the same force and effect as if the signatures of
all of the parties were on a single counterpart, and it shall not be necessary
in making proof of this Agreement to produce more than one (1) such counterpart.

            (c)   Headings. Headings used in this Agreement are for convenience
of reference only and shall not affect the construction of this Agreement.

            (d)   Integration. This Agreement, the other agreements and
documents executed and delivered pursuant to this Agreement and the Credit
Agreement constitute the entire agreement among the parties hereto with respect
to the subject matter hereof.

            (e)   Governing Law. THIS AGREEMENT SHALL BE DEEMED TO BE A CONTRACT
MADE UNDER THE LAWS OF THE STATE OF NEW YORK, AND FOR ALL PURPOSES SHALL BE
CONSTRUED IN ACCORDANCE WITH THE LAWS AND DECISIONS OF SAID STATE, INCLUDING
SECTIONS 5-1401 AND 5-1402 OF THE NEW YORK GENERAL OBLIGATIONS LAW BUT EXCLUDING
ALL OTHER CHOICE OF LAW AND CONFLICTS OF LAWS RULES.

            (f)   Binding Effect. This Agreement shall be binding upon and inure
to the benefit of and be enforceable by the Borrower, Holdings, the Agent and
the Lenders and their respective successors and assigns. Except as expressly set
forth to the contrary herein, this Agreement shall not be construed so as to
confer any right or benefit upon any Person other than the Borrower, Holdings,
the Agent and the Lenders and their respective successors and permitted assigns.

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            (g)   Amendment; Waiver. The parties hereto agree and acknowledge
that nothing contained in this Agreement in any manner or respect limits or
terminates any of the provisions of the Credit Agreement or any of the other
Loan Documents other than as expressly set forth herein and further agree and
acknowledge that the Credit Agreement (as amended hereby) and each of the other
Loan Documents remain and continue in full force and effect and are hereby
ratified and confirmed. Except to the extent expressly set forth herein, the
execution, delivery and effectiveness of this Agreement shall not operate as an
amendment of any rights, power or remedy of the Lenders or the Agent under the
Credit Agreement or any other Loan Document, nor constitute an amendment of any
provision of the Credit Agreement or any other Loan Document. No delay on the
part of any Lender or the Agent in exercising any of their respective rights,
remedies, powers and privileges under the Credit Agreement or any of the Loan
Documents or partial or single exercise thereof, shall constitute an amendment
thereof. On and after the Effective Date each reference in the Credit Agreement
to "this Agreement," "hereunder," "hereof," "herein" or words of like import,
and each reference to the Credit Agreement in the Loan Documents and all other
documents delivered in connection with the Credit Agreement shall mean and be a
reference to the Credit Agreement as amended hereby. The Borrower and Holdings
acknowledge and agree that this Agreement constitutes a "Loan Document" for
purposes of the Credit Agreement, including, without limitation, Section 10.1 of
the Credit Agreement. None of the terms and conditions of this Agreement may be
changed, waived, modified or varied in any manner, whatsoever, except in
accordance with Section 12.1 of the Credit Agreement.

            (h)   True-Up. If at the time of any Event of Default pursuant to
Section 10.1(e) or (f) of the Credit Agreement, the sum of (i) the aggregate
principal amount then outstanding of Revolving Loans plus (ii) the LC
Obligations at such time plus (iii) the aggregate principal amount of Swing Line
Loans then outstanding is less than the sum of such amounts as of the Fourth
Amendment Effective Date as a result of mandatory repayments made pursuant to
Section 4.4(j), the Revolving Lenders shall purchase for cash (according to each
Revolving Lender's Revolver Pro Rata Share) Term Loans on a pro rata basis from
the Term Lenders in the amount of such difference.

      8.    Acknowledgement and Release. Each of the Borrower and Holdings
hereby acknowledges and agrees that all Notices of Borrowing submitted by or on
behalf of the Borrower during the period commencing on September 11, 2001 and
ending on the date of this Agreement have been withdrawn by the Borrower and
Holdings and are of no force and effect, regardless of any action or inaction
taken with respect thereto by the Borrower or any Affiliate of the Borrower, the
Agent or any Lender. Each of the Borrower and Holdings hereby knowingly and
voluntarily releases and forever discharges the Agent and the Lenders and all
present and former directors, officers, agents, representatives, employees,
successors and assigns of the Agent and each Lender and their direct and
indirect owners (collectively, the "Released Parties") from any and all claims,
controversies, actions, causes of action, cross-claims, counter-claims, demands,
debts, compensatory damages, liquidated damages, punitive or exemplary damages,
other damages, claims for costs and attorneys' fees, or liabilities of any
nature whatsoever in law and in equity, both past and present and whether known
or unknown, suspected, or claimed against any Released Party which Holdings or
any of its Affiliates or Subsidiaries may have, which arise out of or are
connected with any Notice of Borrowing submitted by or on behalf of

                                      -11-
<PAGE>
the Borrower at any time during the period commencing on September 11, 2001 and
ending on the date of this Agreement.

                            [signature pages follow]

                                      -12-
<PAGE>
      IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective officers thereunto duly authorized, as of the date
first written above.

                                ORIUS CORP.

                                By:    /s/    Ronald L. Blake
                                   ---------------------------------------------
                                Name:         Ronald L. Blake
                                Title: Chairman of the Board, Chief Executive
                                       Officer and President

                                NATG HOLDINGS, LLC

                                By:    /s/    Ronald L. Blake
                                   ---------------------------------------------
                                Name:         Ronald L. Blake
                                Title:        Vice President

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                BANKERS TRUST COMPANY,
                                individually and as Agent

                                By:    /s/    Robert Telesca
                                   ---------------------------------------------
                                Name:         Robert Telesca
                                Title:        Vice President

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                BANK OF AMERICA, N.A.

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

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                FIRST UNION NATIONAL BANK

                                By:    /s/    Douglas A. Nickel
                                   ---------------------------------------------
                                Name:         Douglas A. Nickel
                                Title:        Vice President

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                NATIONAL CITY BANK, CLEVELAND

                                By:    /s/    John Platek
                                   ---------------------------------------------
                                Name:         John Platek
                                Title:        Assistant Vice President

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                SUNTRUST BANK

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

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                UNION PLANTERS BANK NA

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

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                WACHOVIA BANK, N.A.

                                By:    /s/    Douglas A. Nickel
                                   ---------------------------------------------
                                Name:         Douglas A. Nickel
                                Title:        Vice President

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                BNP PARIBAS

                                By:    /s/    Stephanie Rogers
                                   ---------------------------------------------
                                Name:         Stephanie Rogers
                                Title:        Vice President

                                By:    /s/    Shayn P. March
                                   ---------------------------------------------
                                Name:         Shayn P. March
                                Title:        Vice President

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                        PROMETHEUS INVESTMENT FUNDING NO. 1 LTD.

                             By:  CPF Asset Advisory, LLC, as Investment Manager

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

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

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                HELLER FINANCIAL, INC.

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

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                VAN KAMPEN PRIME RATE INCOME TRUST

                                   By:  Van Kampen Investment Advisory Corp.

                                By:    /s/    Darvin D. Pierce
                                   ---------------------------------------------
                                Name:         Darvin D. Pierce
                                Title:        Executive Director

                                VAN KAMPEN SENIOR FLOATING  RATE FUND

                                   By:  Van Kampen Investment Advisory Corp.

                                By:    /s/    Darvin D. Pierce
                                   ---------------------------------------------
                                Name:         Darvin D. Pierce
                                Title:        Executive Director

                                VAN KAMPEN SENIOR INCOME TRUST

                                   By:  Van Kampen Investment Advisory Corp.

                                By:    /s/    Darvin D. Pierce
                                   ---------------------------------------------
                                Name:         Darvin D. Pierce
                                Title:        Executive Director

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                PPM SPYGLASS FUNDING TRUST

                                By:    /s/    Ann E. Morris
                                   ---------------------------------------------
                                Name:         Ann E. Morris
                                Title:        Authorized Agent

                                WINGED FOOT FUNDING TRUST

                                By:    /s/    Ann E. Morris
                                   ---------------------------------------------
                                Name:         Ann E. Morris
                                Title:        Authorized Agent

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                FREMONT INVESTMENT & LOAN

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

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                       LIBERTY-STEIN ROE ADVISOR FLOATING RATE ADVANTAGE FUND

                          By: Stein Roe & Farnham Incorporated, As Advisor

                       By:    /s/    James R. Fellows
                          ----------------------------------------
                       Name:         James R. Fellows
                       Title: Senior Vice President & Portfolio Manager

                       SRF TRADING, INC.

                       By:    /s/    Diana L. Mushill
                          ----------------------------------------
                       Name:         Diana L. Mushill
                       Title:        Assistant Vice President

                       STEIN ROE FLOATING RATE LIMITED LIABILITY COMPANY

                       By:    /s/    James R. Fellows
                          ----------------------------------------
                       Name:         James R. Fellows
                       Title:        Senior Vice President
                              Stein Roe & Farnham Incorporated, as
                              Advisor to the Stein Roe Floating Rate
                              Limited Liability Company

                       Stein Roe & Farnham Incorporated as Agent for
                       KEYPORT LIFE INSURANCE COMPANY

                       By:    /s/    James R. Fellows
                          ----------------------------------------
                       Name:         James R. Fellows
                       Title: Senior Vice President & Portfolio Manager

                       STEIN ROE & FARNHAM CLO I LTD.

                          By:  Stein Roe & Farnham Incorporated
                                  as  Portfolio Manager

                       By:    /s/    James R. Fellows
                          ----------------------------------------
                       Name:         James R. Fellows
                       Title: Senior Vice President & Portfolio Manager

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                INDOSUEZ CAPITAL FUNDING IV, L.P.

                                     By:  Indosuez Capital as Portfolio Advisor

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

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                CARLYLE HIGH YIELD FUND, L.P.

                                By:    /s/    Linda M. Pace
                                   ---------------------------------------------
                                Name:         Linda M. Pace
                                Title:        Vice President

                                CARLYLE HIGH YIELD PARTNERS II, LTD.

                                By:    /s/    Linda M. Pace
                                   ---------------------------------------------
                                Name:         Linda M. Pace
                                Title:        Vice President

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                 MAPLEWOOD (CAYMAN) LIMITED

                      By: David L. Babson & Company Inc. under delegated
                          authority from Massachusetts Mutual Life Insurance
                          Company as Investment Manager

                 By:  /s/      John B. Wheeler
                    ------------------------------------------------------
                 Name:         John B. Wheeler
                 Title:        Managing Director

                 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY

                      By: David L. Babson & Company Inc. as Investment Advisor

                 By:  /s/      John B. Wheeler
                    ------------------------------------------------------
                 Name:         John B. Wheeler
                 Title:        Managing Director

                 PERSEUS CDO, I LIMITED

                      By: Mass Mutual Life Insurance Co., as Portfolio Manager

                 By:    /s/    Steven J. Katz
                    ------------------------------------------------------
                 Name:         Steven J. Katz
                 Title:        Associate General Counsel

                 SAAR HOLDINGS CDO LIMITED

                      By: Mass Mutual Life Insurance Co., as Collateral Manager

                 By:    /s/    Steven J. Katz
                    ------------------------------------------------------
                 Name:         Steven J. Katz
                 Title:        Associate General Counsel

                 SIMSBURY CLO, LIMITED

                      By: David L. Babson & Company Inc. under delegated
                          authority from Massachusetts Mutual Life Insurance
                          Company as Investment Manager

                 By:  /s/      John B. Wheeler
                    ------------------------------------------------------
                 Name:         John B. Wheeler
                 Title:        Managing Director

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                 SUFFIELD CLO LTD

                      By:  D. L. Babson & Co., Inc., as Collateral Manager

                 By:  /s/      John B. Wheeler
                    ------------------------------------------------------
                 Name:         John B. Wheeler
                 Title:        Managing Director

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                PILGRIM CLO 1999-1 LTD
                       By:  Pilgrim Investments, Inc., as its investment manager

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

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                 AIMCO CDO SERIES 2000-A

                                By:    /s/    Robert B. Bodett
                                   ---------------------------------------------
                                Name:         Robert B. Bodett
                                Title:        Authorized Signatory

                                By:    /s/    Dorothy E. Even
                                   ---------------------------------------------
                                Name:         Dorothy E. Even
                                Title:        Authorized Signatory

                                ALLSTATE LIFE INSURANCE COMPANY

                                By:    /s/    Robert B. Bodett
                                   ---------------------------------------------
                                Name:         Robert B. Bodett
                                Title:        Authorized Signatory

                                By:    /s/    Dorothy E. Even
                                   ---------------------------------------------
                                Name:         Dorothy E. Even
                                Title:        Authorized Signatory

                            ORIUS FOURTH AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>

                                        FIRST DOMINION FUNDING II

                                        By:    /s/    Andrew H. Marshak
                                           -------------------------------------
                                        Name:         Andrew H. Marshak
                                        Title:        Authorized Signatory

                                        FIRST DOMINION FUNDING III

                                        By:    /s/    Andrew H. Marshak
                                           -------------------------------------
                                        Name:         Andrew H. Marshak
                                        Title:        Authorized Signatory

                            ORIUS FOURTH AMENDMENT TO
                     AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                      KATONAH I, LTD.

                                      By:    /s/    Ralph Della Rocca
                                         -------------------------------------
                                      Name:         Ralph Della Rocca
                                      Title:        Authorized Officer
                                             Katonah Capital, L.L.C., as Manager

                                      KATONAH II, LTD.

                                      By:    /s/    Ralph Della Rocca
                                         -------------------------------------
                                      Name:         Ralph Della Rocca
                                      Title:        Authorized Officer
                                             Katonah Capital, L.L.C., as Manager

                            ORIUS FOURTH AMENDMENT TO
                     AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                        KZH CNC LLC

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

                                        KZH STERLING LLC

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

                            ORIUS FOURTH AMENDMENT TO
                     AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                        MAGNETITE ASSET INVESTORS LLC

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

                            ORIUS FOURTH AMENDMENT TO
                     AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                        GREAT POINT CLO 1999-1 LTD.,
                                        as Term Lender

                                         By: Sankaty Advisors, Inc.,
                                             as Collateral Manager

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

                                        SANKATY HIGH YIELD PARTNERS II, L.P.

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

                            ORIUS FOURTH AMENDMENT TO
                     AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                        GENERAL ELECTRIC CAPITAL CORPORATION

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

                            ORIUS FOURTH AMENDMENT TO
                     AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                        LONGLANE MASTER TRUST IV

                                          By:  Fleet National Bank as Trust
                                               Administrator

                                        By:    /s/    Kevin Keane
                                           -------------------------------------
                                        Name:         Kevin Keane
                                        Title:        Managing Director

                            ORIUS FOURTH AMENDMENT TO
                     AMENDED AND RESTATED CREDIT AGREEMENT
<PAGE>
                                   SCHEDULE I

                                DEPOSIT ACCOUNTS

                              [Borrower to Provide]
<PAGE>
                                    EXHIBIT A

                 FORM OF AMENDED AND RESTATED SECURITY AGREEMENT
<PAGE>
                                    EXHIBIT B

                         FORM OF PERFECTION CERTIFICATE
<PAGE>
                                    EXHIBIT C

                             CERTIFICATE OF OFFICER

            I, the undersigned, Chief Executive Officer of NATG Holdings, LLC, a
Delaware limited liability company (the "Borrower"), and Orius Corp., a Florida
corporation ("Holdings"), in accordance with Section 5(a) of that certain Fourth
Amendment to Amended and Restated Credit Agreement dated as of November ___,
2001 (the "Agreement") among Holdings, the Borrower, Bankers Trust Company, as
Agent, and the financial institutions party to the Credit Agreement (as defined
in the Agreement), do hereby certify on behalf of the Borrower and Holdings and
not in my individual capacity, the following:

            1. The representations and warranties set forth in Section 4 of the
            Agreement are true and correct in all material respects as of the
            date hereof except to the extent such representations and warranties
            are expressly made as of a specified date in which event such
            representations and warranties were true and correct in all material
            respects as of such specified date;

            2. No Event of Default or Unmatured Event of Default has occurred
            and is continuing after giving effect to the Agreement; and

            3. The conditions of Section 5 of the Agreement have been fully
            satisfied.

            Unless otherwise defined herein, capitalized terms used herein shall
have the meanings set forth in the Agreement.

            IN WITNESS WHEREOF, the undersigned has duly executed and delivered
on behalf of the Borrower and Holdings this Certificate of Officer on this ____
day of November, 2001.

ORIUS CORP.                                       NATG HOLDINGS, LLC

By:     _____________________                     By:     _____________________

Name:   _____________________                     Name:   _____________________

Title:  _____________________                     Title:  _____________________
<PAGE>
                                    EXHIBIT D

                           REAFFIRMATION OF GUARANTEE

      Each of the undersigned acknowledges receipt of a copy of the Fourth
Amendment to Amended and Restated Credit Agreement (the "Agreement"; capitalized
terms used herein shall, unless otherwise defined herein, have the meanings
provided in the Agreement) dated as of November ___, 2001, by and among Orius
Corp., a Florida corporation, NATG Holdings, LLC, a Delaware limited liability
company, Bankers Trust Company, as administrative agent, and the financial
institutions party to the Credit Agreement (as defined in the Agreement) as
Lenders, consents to such Agreement and each of the transactions referenced in
the Agreement and hereby reaffirms its obligations under the Holdings Guaranty
or Subsidiary Guaranty, as applicable.

Dated as of November ___, 2001.

<TABLE>
<S>                                             <C>
ORIUS CORP.

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

CATV SUBSCRIBER SERVICES, INC.                  CABLEMASTERS CORP.

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

CHANNEL COMMUNICATIONS, INC.                    EXCEL CABLE CONSTRUCTION, INC.

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

DAS-CO OF IDAHO, INC.                           ORIUS INFORMATION TECHNOLOGIES, LLC

By:                                             By:
   ---------------------------------------         ---------------------------------------
Name:                                           Name:
     -------------------------------------           -------------------------------------
Title:                                          Title:
      ------------------------------------            ------------------------------------
</TABLE>
<PAGE>
<TABLE>
<S>                                             <C>
U.S. CABLE, INC.                                NETWORK CABLING SERVICES, INC.

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

COPENHAGEN UTILITIES & CONSTRUCTION, INC.       SCHATZ UNDERGROUND CABLE, INC.

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

TEXEL CORPORATION                               FENIX TELECOMMUNICATIONS SERVICES, INC.

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

FENIX TELECOM SERVICES LIMITED PARTNERSHIP      FENIX HOLDINGS, INC.

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

IRWIN TELECOM SERVICES, L.P.                    IRWIN TELECOM HOLDINGS, INC.

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

IRWIN TELECOM SERVICES, INC.                    MIDWEST SPLICING & ACTIVATION, INC.

By:                                             By:
   ---------------------------------------         ---------------------------------------
Name:                                           Name:
     -------------------------------------           -------------------------------------
Title:                                          Title:
      ------------------------------------            ------------------------------------
</TABLE>
<PAGE>
<TABLE>
<S>                                             <C>
HATTECH, INC.                                   ORIUS CAPITAL CORP.

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

LISN COMPANY                                    LISN, INC.

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

ARION SUB, INC.                                 NETWORK CABLING HOLDINGS, INC.

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

NETWORK COMPREHENSIVE TELECOM, L.P.             QMW COMMUNICATIONS, INC.

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

ORIUS TELECOM SERVICES, INC.                    ORIUS HOLDINGS, INC.

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

ORIUS BROADBAND SERVICES, INC.                  ORIUS TELECOMMUNICATION SERVICES, INC.

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

ORIUS CENTRAL OFFICE SERVICES, INC.             ORIUS TELECOM PRODUCTS, INC.

By:                                             By:
   ---------------------------------------         ---------------------------------------
Name:                                           Name:
     -------------------------------------           -------------------------------------
Title:                                          Title:
      ------------------------------------            ------------------------------------
</TABLE>
<PAGE>
<TABLE>
<S>                                             <C>
ORIUS INTEGRATED PREMISE SERVICES, INC.         ORIUS TELECOMMUNICATION HOLDINGS (WI), INC.

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

ORIUS TELECOMMUNICATION SERVICES (WI), LP       ORIUS TELECOMMUNICATION SERVICES (WI), INC.

By:                                             By:
   ---------------------------------------         ---------------------------------------
Name:                                           Name:
     -------------------------------------           -------------------------------------
Title:                                          Title:
      ------------------------------------            ------------------------------------
</TABLE>
<PAGE>
                                    EXHIBIT E

                    FIRST AMENDMENT TO EQUITY CALL AGREEMENT
<PAGE>
                                SCHEDULE 6.11(c)

                                 REAL PROPERTY

                              [Borrower to Provide]
<PAGE>
                                  SCHEDULE 6.14

                                 CAPITALIZATION

                              [Borrower to Provide]
<PAGE>
                                  SCHEDULE 6.15

                         CAPITALIZATION OF SUBSIDIARIES

                              [Borrower to Provide]<PAGE>
                                                             EXHIBIT 10.4

                    FIRST AMENDMENT TO EQUITY CALL AGREEMENT

                  THIS FIRST AMENDMENT TO EQUITY CALL AGREEMENT (this
"Amendment"), dated as of November 20, 2001, is made by and among Orius Corp., a
Florida corporation ("Holdings"), NATG Holdings, LLC, a Delaware limited
liability company ("Borrower"), the investors party to the Equity Call Agreement
in their capacities as Equity Investors (collectively, the "Equity Investors")
and Bankers Trust Company, in its capacity as administrative agent
("Administrative Agent") for the Lenders (as defined in the hereinafter defined
Credit Agreement).

                              W I T N E S S E T H :

         WHEREAS, Holdings, Borrower, the financial institutions from time to
time party thereto, including Bankers Trust Company, in their capacities as
lenders thereunder (collectively, the "Lenders," and each individually, a
"Lender"), and Administrative Agent have entered into the Amended and Restated
Credit Agreement dated as of July 5, 2000, as amended, providing for the making
of Loans and the issuance of, and participation in, Letters of Credit as
contemplated therein (as used herein, the term "Credit Agreement" means the
Amended and Restated Credit Agreement described above in this paragraph, as the
same may be amended, modified, extended, renewed, replaced, restated or
supplemented from time to time, and including any agreement extending the
maturity of or restructuring of all or any portion of the Indebtedness under
such agreement or any successor agreements);

         WHEREAS, Holdings, Borrower, the Equity Investors and Administrative
Agent have entered into the Equity Call Agreement dated as of July 27, 2001 (as
used herein the term "Equity Call Agreement" means the Equity Call Agreement
described above in this paragraph, as the same may be amended, modified,
extended, renewed, replaced, restated or supplemented from time to time)
providing for the making of Capital Infusions by the Equity Investors under
certain circumstances described therein;

         WHEREAS, Holdings, Borrower, the Lenders and Administrative Agent are
party to a Fourth Amendment to Amended and Restated Credit Agreement dated as of
the date hereof (the "Fourth Amendment"); and

         WHEREAS, it is a condition precedent to the Fourth Amendment and to
continued extensions of credit pursuant to the Credit Agreement that the Equity
Investors, Holdings and Borrower shall have executed and delivered this
Amendment;

         NOW, THEREFORE, in consideration of such benefits and for other good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, intending to be legally bound, and with full knowledge that
Administrative Agent and the Lenders will rely on the contents of this Amendment
in providing extensions of credit to Borrower under the Credit Agreement,
Holdings, Borrower and each Equity Investor hereby certify to and covenant and
agree with Administrative Agent as follows:

         1. Definitions. Capitalized terms used herein, but not expressly
defined herein, shall have the meanings given to such terms in the Equity Call
Agreement.
<PAGE>
         2. Amendments to Equity Call Agreement. The Equity Call Agreement is
hereby amended as follows:

         (a) Section 2 of the Equity Call Agreement is amended by amending and
restating such Section in its entirety to read as follows:

                  2. Equity Call Commitment. Each Equity Investor hereby
         commits, severally and for itself alone, subject to the terms and
         conditions of this Agreement, but otherwise irrevocably, to
         Administrative Agent and Lenders that if, at any time: (i) on or prior
         to July 21, 2002 the aggregate amount of cash balances of Borrower and
         its Subsidiaries (it being acknowledged and agreed by all of the
         parties hereto that the amount of such cash balances shall be deemed to
         include the amount of any Capital Infusion not yet made but for which
         an Equity Call Notice has been made in accordance with the terms hereof
         so long as such Capital Infusion is actually made within the time
         period required hereunder, and shall be deemed to include $10,000,000
         from and after the Third Amendment Effective Date until such time as
         Holdings and Borrower receive the WSP Equity Infusion in accordance
         with the terms of the Third Amendment so long as such $10,000,000 is
         actually received by Holdings and Borrower on or prior to the tenth
         (10th) Business Day following the Third Amendment Effective Date) held
         in accounts with financial institutions and Cash Equivalents of
         Borrower and its Subsidiaries plus the amount of Availability falls
         below $15,000,000 for three (3) consecutive Business Days (a "Liquidity
         Shortfall"); (ii) on or prior to July 21, 2002 the Equity Investors
         receive a certificate from a Responsible Officer of Borrower certifying
         on behalf of Borrower that the Board of Directors of Borrower has
         elected to request that the Equity Investors make a Capital Infusion
         pursuant to this Agreement (a "Borrower Request"); (iii) upon an Event
         of Default under Section 10.1(a) of the Credit Agreement (a "Payment
         Default"); (iv) upon an Event of Default under Section 10.1(e) or (f)
         of the Credit Agreement (a "Bankruptcy or Insolvency Event"); (v) on or
         prior to July 21, 2002 the Majority Equity Investors elect to have the
         Equity Investors make a Capital Infusion and give written notice
         thereof to Borrower and Administrative Agent (an "Equity Investors
         Election"); or (vi) upon the occurrence of a Trigger Date (a "Trigger
         Event" and, together with each Liquidity Shortfall, Borrower Request,
         Payment Default, Bankruptcy or Insolvency Event and Equity Investors
         Election, each an "Equity Call Event"), each Equity Investor shall
         within twelve (12) Business Days after written notice is delivered by
         (1) Administrative Agent or Borrower (with a copy to Administrative
         Agent) to the Equity Investors, in the case of a Liquidity Shortfall or
         Trigger Event, (2) Administrative Agent to the Equity Investors, in the
         case of a Payment Default or a Bankruptcy or Insolvency Event, (3)
         Borrower to the Equity Investors and Administrative Agent in the case
         of a Borrower Request, and (4) the Majority Equity Investors to
         Borrower, Administrative Agent and the other Equity Investors, in the
         case of an Equity Investors Election (any such notice described in
         clauses (1), (2), (3) and (4) above, an "Equity Call Notice"), make
         such Equity Investor's Pro Rata Share of a Capital Infusion to Holdings
         (with Holdings being obligated to simultaneously make a capital
         contribution in the same amount as such contribution to Borrower)

                                     - 2 -
<PAGE>
         which Capital Infusion shall be (w) in the case of a Trigger Event, in
         an aggregate amount necessary for the Revolving Loan Availability Ratio
         and the Capital Infusion Availability Ratio to be equaled as nearly as
         possible (subject to rounding) treating all Loans or Letters of Credit
         made or issued on or after the Fourth Amendment Effective Date (to the
         extent outstanding on the Trigger Date) as having been requested on
         such date rather than on the dates actually requested for purposes of
         determining the Revolving Loan Availability Ratio and the Capital
         Infusion Availability Ratio (provided that, in the case of a Trigger
         Event due to clause (i) of the definition of Trigger Date, Working
         Capital Loans outstanding on the Trigger Date shall be reduced by the
         amount of the Capital Infusion to be made as a result of such Trigger
         Event for purposes of calculating the amount of such Capital Infusion
         and the applicable Revolving Loan Availability Ratio and Capital
         Infusion Availability Ratio), (x) in the case of a Payment Default or a
         Liquidity Shortfall, in an aggregate amount then necessary to cure such
         Payment Default or Liquidity Shortfall (or, if the Maximum Infusion
         Balance at the time of determination thereof is less than the amount
         necessary to effect such cure, in the entire amount of the Maximum
         Infusion Balance), (y) in the full amount of the Maximum Infusion
         Balance in the case of a Bankruptcy or Insolvency Event, and (z) in
         such amount as requested by Borrower in a Borrower Request or specified
         by the Majority Equity Investors in an Equity Investors Election
         (limited to the Maximum Infusion Balance at such time); provided,
         however, that, notwithstanding the foregoing, in no event shall the
         Equity Investors be required pursuant hereto to make any payments or be
         obligated for any amounts other than the Capital Infusions in an
         aggregate amount not to exceed the Maximum Infusion Amount; and
         provided further, that if the Maximum Infusion Balance is insufficient
         to obtain the cure of any such Trigger Event, Payment Default or
         Liquidity Shortfall, the Equity Investors nonetheless shall be obliged
         to make a Capital Infusion to the full extent of the Maximum Infusion
         Balance then available in mitigation thereof. Administrative Agent,
         Borrower and/or the Majority Equity Investors, as applicable, may make
         one Equity Call Notice or multiple Equity Call Notices; subject,
         however, to the foregoing limitation on the maximum amount of Capital
         Infusions. Each Equity Call Notice sent by Administrative Agent or
         Borrower regarding a Liquidity Shortfall shall specify the amount of
         such Liquidity Shortfall and include the amount of Availability used to
         calculate the Liquidity Shortfall and be accompanied by a copy of the
         most recent daily cash balance report received by Administrative Agent
         pursuant to Section 7.17 of the Credit Agreement. Each Equity Call
         Notice sent by Administrative Agent regarding a Payment Default shall
         specify the amount of such Payment Default. Each Equity Call Notice
         regarding a Trigger Event shall specify the amount of Capital Infusion
         necessary to cure such Trigger Event, the Revolving Loan Availability
         Ratio and Capital Infusion Availability Ratio and the outstanding
         principal amount of Loans and Letters of Credit made or issued on or
         after the Fourth Amendment Effective Date. Promptly upon receipt by
         Holdings of any Capital Infusion, Holdings shall simultaneously make a
         capital contribution in the same amount in cash to Borrower, provided
         that the proceeds of each Capital Infusion made pursuant to a

                                     - 3 -
<PAGE>
         Trigger Event pursuant to clause (i) of the definition of Trigger Date
         or a Payment Default shall be paid over and delivered by the Equity
         Investors by wire transfer of immediately available funds directly to
         Administrative Agent, and not to Holdings, for application to the
         Obligations within twelve (12) Business Days after an Equity Call
         Notice is delivered to the Equity Investors. In the event that a
         Bankruptcy or Insolvency Event and a Trigger Event under clause (i) of
         the definition of Trigger Date occurs on the same date, then the
         Capital Infusion relating to such Trigger Event shall be fully
         satisfied as provided above prior to the making of a Capital Infusion
         pursuant to such Bankruptcy or Insolvency Event. Administrative Agent
         will apply the proceeds of each Capital Infusion received by
         Administrative Agent (i) pursuant to a Payment Default to the payment
         of the defaulted Obligations which caused such Payment Default and (ii)
         pursuant to a Trigger Event under clause (i) of the definition of
         Trigger Date to the payment of Working Capital Loans in accordance with
         the Credit Agreement. Promptly upon learning of a Liquidity Shortfall
         (other than through the receipt of an Equity Call Notice from
         Administrative Agent relating to a Liquidity Shortfall), Borrower shall
         notify in writing Administrative Agent and the Equity Investors of the
         amount thereof (it being acknowledged and agreed by all of the parties
         hereto that (i) such notice may be satisfied by Borrower's prompt
         delivery of an Equity Call Notice regarding a Liquidity Shortfall which
         satisfies the requirements set forth above in this Section 2 and (ii)
         the failure by Borrower to deliver such notice shall not in any way
         limit the right of Administrative Agent to deliver an Equity Call
         Notice regarding a Liquidity Shortfall and the Equity Investors'
         obligations to make a Capital Infusion with respect thereto). Holdings
         and Borrower hereby acknowledge and agree to the terms hereof and their
         obligations hereunder.

         3. Representations and Warranties. In order to induce Administrative
Agent to enter into this Amendment and the Lenders to continue to make Loans and
issue Letters of Credit pursuant to the Credit Agreement, each of Holdings and
each Equity Investor hereby represents and warrants as of the date hereof to
Administrative Agent and the Lenders that:

                  (a) Such Person (i) is a duly organized and validly existing
corporation, limited liability company or other entity and is in good standing
under the laws of the jurisdiction of its organization, and has all necessary
power and authority to own its property and assets and to transact the business
in which it is engaged and presently proposes to engage and (ii) is duly
qualified and is authorized to do business and is in good standing in each
jurisdiction where the conduct of its business requires such qualification
except for failures to be so qualified which, individually or in the aggregate,
could not reasonably be expected to have a MAE.

                  (b) Such Person has all necessary power and authority to
execute, deliver and perform the terms and provisions of this Amendment and has
taken all necessary action to authorize the execution, delivery and performance
by it of this Amendment. Such Person has duly executed and delivered this
Amendment and this Amendment constitutes the legal, valid and binding obligation
of such Person enforceable in accordance with its terms, except to the extent
that the enforceability hereof or thereof may be limited by applicable
bankruptcy,

                                     - 4 -
<PAGE>
insolvency, reorganization, moratorium or other similar laws affecting
creditors' rights generally and by equitable principles (regardless of whether
enforcement is sought in equity or at law).

                  (c) Neither the execution, delivery or performance by such
Person of this Amendment, nor compliance by it with the terms and provisions
hereof (i) will contravene any applicable provision of any law, statute, rule or
regulation, or any applicable order, writ, injunction or decree of any court or
governmental instrumentality, (ii) will conflict with or result in any breach
of, any of the terms, covenants, conditions or provisions of, or constitute a
default under, or result in the creation or imposition of (or the obligation to
create or impose) any Lien upon any of the property or assets of such Person
pursuant to the terms of any indenture, mortgage, deed of trust, loan agreement
or any other agreement, contract or instrument to which such Person or any of
its Subsidiaries is a party or by which it or any of its property or assets is
bound or to which it may be subject or (iii) will violate any provision of the
Organizational Documents of such Person.

                  (d) No order, consent, approval, license, authorization or
validation of, or filing, recording or registration with (except as have been
obtained or made prior to the Fourth Amendment Effective Date), or exemption by,
any governmental or public body or authority, or any subdivision thereof, is
required to authorize, or is required in connection with, (i) the execution,
delivery and performance of this Amendment, or (ii) the legality, validity,
binding effect or enforceability of this Amendment with respect to such Person.

                  (e) There are no actions, suits or proceedings pending or, to
the best knowledge of such Person, threatened with respect to such Person (i)
that could reasonably be expected to have a MAE or (ii) with respect to this
Amendment or on the ability of such Person to perform its respective obligations
hereunder.

         4. GOVERNING LAW. THIS AMENDMENT SHALL BE DEEMED TO BE A CONTRACT MADE
UNDER THE LAWS OF THE STATE OF NEW YORK, AND FOR ALL PURPOSES SHALL BE CONSTRUED
IN ACCORDANCE WITH THE LAWS AND DECISIONS OF SAID STATE, INCLUDING SECTIONS
5-1401 AND 5-1402 OF THE NEW YORK GENERAL OBLIGATIONS LAW BUT EXCLUDING ALL
OTHER CHOICE OF LAW AND CONFLICTS OF LAW RULES.

         5. Miscellaneous.

                  (a) This Amendment and the Equity Call Agreement constitute
the sole and entire agreement among the Equity Investors, Holdings, Borrower and
Administrative Agent with respect to the subject matter hereof.

                  (b) Time is of the essence of this Amendment.

                  (c) Wherever possible, any provision in this Amendment which
is prohibited or unenforceable in any jurisdiction shall, as to such
jurisdiction, be ineffective only to the extent of such prohibition or
enforceability without invalidating the remaining provisions hereof, and any
such prohibition or enforceability in any one jurisdiction shall not invalidate
or render unenforceable such provision in any other jurisdiction.

                                      - 5 -
<PAGE>
                  (d) The parties hereto agree and acknowledge that nothing
contained in this Amendment in any manner or respect limits or terminates any of
the provisions of the Equity Call Agreement other than as expressly set forth
herein and further agree and acknowledge that the Equity Call Agreement (as
amended hereby) remains and continues in full force and effect and is hereby
ratified and confirmed. Except to the extent expressly set forth herein, the
execution, delivery and effectiveness of this Amendment shall not operate as an
amendment of any rights, power or remedy of Administrative Agent under the
Equity Call Agreement, nor constitute an amendment of any provision of the
Equity Call Agreement. No delay on the part of Administrative Agent in
exercising any of their respective rights, remedies, powers and privileges under
the Equity Call Agreement or partial or single exercise thereof, shall
constitute an amendment thereof. On and after the date hereof each reference in
the Equity Call Agreement to "this Agreement," "hereunder," "hereof," "herein"
or words of like import, and each reference to the Equity Call Agreement in the
Credit Agreement and the other Loan Documents and all other documents delivered
in connection with the Credit Agreement shall mean and be a reference to the
Equity Call Agreement as amended hereby. None of the terms and conditions of
this Amendment may be changed, waived, modified or varied in any manner,
whatsoever, except in accordance with Section 13(d) of the Equity Call
Agreement.

                  (e) This Amendment may be executed in one or more counterparts
and each such counterpart shall constitute an original and all such counterparts
together shall constitute one and the same instrument.

                  (f) All Section headings herein are for convenience of
reference only and shall not limit or otherwise affect the meaning or
interpretation of the provisions of this Amendment.

                  (g) This Amendment is a Loan Document and shall be governed
and construed accordingly.

                            [signatures pages follow]

                                     - 6 -
<PAGE>
         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed and delivered by their duly authorized officers as of the date
first above written.

                            WILLIS STEIN & PARTNERS III, L.P.
                            By: Willis Stein & Partners Management III, L.P.,
                                   Its General Partner
                            By:  Willis Stein & Partners Management III, L.L.C.,
                                   Its General Partner

                            By:        /s/      Robert C. Froetscher
                                ------------------------------------------------
                            Name:               Robert C. Froetscher
                            Title:              Managing Director

                            WILLIS STEIN & PARTNERS DUTCH III - A, L.P.
                            By: Willis Stein & Partners Management III, L.P.,
                                   Its General Partner
                            By:  Willis Stein & Partners Management III, L.L.C.,
                                   Its General Partner

                            By:        /s/      Robert C. Froetscher
                                ------------------------------------------------
                            Name:               Robert C. Froetscher
                            Title:              Managing Director

                            WILLIS STEIN & PARTNERS DUTCH III - B, L.P.
                            By: Willis Stein & Partners Management III, L.P.,
                                   Its General Partner
                            By:  Willis Stein & Partners Management III, L.L.C.,
                                   Its General Partner

                            By:        /s/      Robert C. Froetscher
                                ------------------------------------------------
                            Name:               Robert C. Froetscher
                            Title:              Managing Director

                            WILLIS STEIN & PARTNERS III - C, L.P.
                            By: Willis Stein & Partners Management III, L.P.,
                                   Its General Partner
                            By:  Willis Stein & Partners Management III, L.L.C.,
                                   Its General Partner

                            By:        /s/      Robert C. Froetscher
                                ------------------------------------------------
                            Name:               Robert C. Froetscher
                            Title:              Managing Director

                            ORIUS CORP.

                            By:        /s/      Ronald L. Blake
                                ------------------------------------------------
                            Name:               Ronald L. Blake
                            Title:     Chairman of the Board, Chief Executive
                                         Officer and President

                            NATG HOLDINGS, LLC

                            By:        /s/      Ronald L. Blake
                                ------------------------------------------------
                            Name:               Ronald L. Blake
                            Title:              Vice President

                    FIRST AMENDMENT TO EQUITY CALL AGREEMENT
<PAGE>
                            BANKERS TRUST COMPANY,
                            as Administrative Agent

                            By:        /s/      Robert Telesca
                                ------------------------------------------------
                            Name:               Robert Telesca
                            Title:              Vice President

                    FIRST AMENDMENT TO EQUITY CALL AGREEMENT

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