Document:

<PAGE>
                                                                     Exhibit 4.4

                                                                  EXECUTION COPY

         AMENDMENT NO. 2, dated as of January 15, 2001 ("Amendment No 2"), among
Acterna Corporation, a Delaware corporation (the "Company"), Clayton, Dubilier &
Rice Fund V Limited Partnership, a Cayman Islands limited partnership ("Fund V")
and Clayton, Dubilier & Rice Fund VI Limited Partnership, a Cayman Islands
limited partnership ("Fund VI"), to the Registration Rights Agreement, dated as
of May 21, 1998 (the "Registration Rights Agreement"), among the Company, Fund V
and the other parties thereto, and as previously amended by Amendment No. 1,
dated as of May 23, 2000, among the Company, Fund V and Fund VI. Capitalized
terms used herein without definition have the meanings given to them in the
Registration Rights Agreement.

         WHEREAS, in order to obtain additional liquidity for general corporate
purposes, Acterna LLC, a Delaware limited liability company wholly-owned and
controlled by the Company ("Acterna LLC"), and the Company entered into an
Investment Agreement, dated as of December 27, 2001 (the "Investment
Agreement"), with Fund VI, under which Acterna LLC issued and sold to Fund VI
$75,000,000 aggregate principal amount of its 12% Senior Secured Convertible
Notes Due 2007 (the "Notes");

         WHEREAS, the Investment Agreement and the Notes provide for the
issuance by the Company of warrants (the "Warrants") to purchase Common Stock to
the holders of any Notes repurchased or redeemed by Acterna LLC prior to their
stated maturity; and

         WHEREAS, the Company, Fund V and Fund VI desire to amend the
Registration Rights Agreement to provide registration rights to Fund VI in
respect of the shares of Common Stock issuable upon conversion of the Notes or
upon exercise of the Warrants.

         NOW, THEREFORE, in consideration of the premises and the mutual
promises and agreements herein made, the receipt and sufficiency of which is
hereby acknowledged, the parties hereto agree as follows:

         1. Amendment to Section 2. The definition of "Registrable Securities"
in Section 2 of the Registration Rights Agreement is hereby amended to read in
its entirety as follows:

                  "Registrable Securities": (a) The Common Stock (i) received by
                  Fund V, the Manager and the Trusts as a result of the Merger,
                  (ii) issued to each of Fund V and Fund VI pursuant to the Fund
                  Stock Subscription Agreements, (iii) issued to Fund VI (or any
                  permitted transferee) upon conversion of any of the Company's
                  12% Senior Secured Convertible Notes Due 2007 (the "Notes")
                  issued pursuant to that certain Investment Agreement, dated as
                  of December 27, 2001 (the "Investment Agreement"), between the
                  Company, Acterna LLC and Fund VI, (iv) issued to Fund VI (or
                  any permitted transferee) upon exercise of any warrants to
                  purchase Common Stock received by Fund VI (or its transferee)
                  pursuant to the Investment Agreement or the Notes or (v)
                  issued to Individual Investors pursuant to a stock
                  subscription agreement or other agreement that provides that
                  such

<PAGE>

                  Common Stock shall be Registrable Securities, (b) any shares
                  of Common Stock issued pursuant to the terms of, and under the
                  circumstances set forth in, Section 4, and (c) any securities
                  issued or issuable with respect to any Common Stock referred
                  to in the foregoing clauses (w) upon any conversion or
                  exchange thereof, (x) by way of stock dividend or stock split,
                  (y) in connection with a combination of shares,
                  recapitalization, merger, consolidation or other
                  reorganization or (z) otherwise, in all cases subject to the
                  last paragraph of Section 3.3. As to any particular
                  Registrable Securities, once issued such securities shall
                  cease to be Registrable Securities when (A) a registration
                  statement (other than a Special Registration pursuant to which
                  such securities were issued by the Company) with respect to
                  the sale of such securities shall have become effective under
                  the Securities Act and such securities shall have been
                  disposed of in accordance with such registration statement,
                  (B) such securities shall have been distributed to the public
                  in reliance upon Rule 144, (C) such securities shall have been
                  otherwise transferred, new certificates for such securities
                  not bearing a legend restricting further transfer shall have
                  been delivered by the Company and subsequent disposition of
                  such securities shall not require registration or
                  qualification of such securities under the Securities Act or
                  any similar state law then in force, or (D) such securities
                  shall have ceased to be outstanding.

         2. Amendment to Section 4.4. The address of the Company set forth in
Section 4.4 of the Registration Rights Agreement is hereby amended as follows:

                   Acterna Corporation
                   20410 Observation Drive
                   Germantown, Maryland  20876
                   Attention:  General Counsel

         3. Confirmation of Registration Rights Agreement. Other than as
expressly modified pursuant to this Amendment, all provisions of the
Registration Rights Agreement remain unmodified and in full force and effect.

         4. Miscellaneous. This Amendment shall be governed by and construed in
accordance with the internal laws of the State of New York without giving effect
to any choice or conflict of law provision or rule to the extent such provision
or rule would require or permit the application of the laws of any jurisdiction
other than the State of New York. This Amendment may be executed in one or more
counterparts, each of which shall be deemed an original and all of which shall
together constitute one and the same instrument and shall bind and inure to the
benefit of the parties and their respective successors and assigns.

                                       2

<PAGE>

                  IN WITNESS WHEREOF, each of the undersigned has executed this
Amendment as of the date first written above.

                              ACTERNA CORPORATION

                              By:______________________________
                                  Name:
                                  Title:

                              CLAYTON, DUBILIER & RICE
                                 FUND V LIMITED PARTNERSHIP

                              By:     CD&R Associates V Limited Partnership,
                                        the general partner

                              By:     CD&R Investment Associates II, Inc.,
                                        its managing general partner

                              By:______________________________
                                  Name:
                                  Title:

                              CLAYTON, DUBILIER & RICE
                                 FUND VI LIMITED PARTNERSHIP

                              By:     CD&R Associates VI Limited Partnership,
                                        the general partner

                              By:     CD&R Investment Associates VI, Inc.,
                                        its managing general partner

                              By:______________________________
                                 Name:
                                 Title:

                                       3<PAGE>

                                                                    Exhibit 10.1

                                                                  EXECUTION COPY

                                SECOND AMENDMENT

          SECOND AMENDMENT, dated as of December 27, 2001 (this "Amendment"),
                                                                 ---------
to the Credit Agreement, dated as of May 23, 2000 (as amended, supplemented or
otherwise modified, the "Credit Agreement"), among Acterna LLC (f/k/a Dynatech
                         ----------------
LLC), a Delaware limited liability company (the "Primary Borrower"), Acterna
                                                 ----------------
International GmbH, a German company, the banks and other financial institutions
from time to time parties thereto (collectively, the "Lenders"), JPMorgan Chase
                                                      -------
Bank (as successor by merger to Morgan Guaranty Trust Company of New York), as
agent for the German Term Loan Lenders named therein, JPMorgan Chase Bank (as
successor by merger to Morgan Guaranty Trust Company of New York), as
administrative agent (in such capacity, the "Administrative Agent") for the
                                             --------------------
Lenders, Credit Suisse First Boston, as syndication agent for the Lenders and
JPMorgan Chase Bank (f/k/a The Chase Manhattan Bank) and Bankers Trust Company,
each in its capacity as co-documentation agents for the Lenders.

                              W I T N E S S E T H:

          WHEREAS, pursuant to the Credit Agreement, the Lenders have agreed to
make, and have made, certain loans and other extensions of credit to the Primary
Borrower;

          WHEREAS, the Primary Borrower has requested, the Lenders to agree to
amend the Credit Agreement; and

          WHEREAS, the Lenders have agreed to the requested amendments but only
on the terms and conditions contained in this Amendment;

          NOW, THEREFORE, the parties hereto hereby agree as follows:

          Section 1. Defined Terms. Terms defined in the Credit Agreement and
                     -------------
used herein shall have the meanings given to them in the Credit Agreement.

          Section 2. Amendment to Subsection 1.1 (Definitions).  Subsection 1.1
                     ----------------------------------------
of the Credit Agreement is hereby amended as follows:

          (a) by deleting therefrom the definitions of the following defined
terms in their respective entireties and substituting in lieu thereof the
following definitions:

        "'Active Subsidiary':  each Subsidiary of the Borrower other than any
          -----------------
        Inactive Subsidiary.";

        "`Applicable Commitment Fee Rate': 0.50% per annum.";
          ------------------------------

        "`Applicable Margin": (a) with respect to Tranche B Loans, 4.00% (for
          -----------------
        Eurocurrency Loans), and 3.00% (for ABR Loans), (b) with respect to the
        German Term Loan, 0.30% and (c) with respect to Revolving Credit Loans,
        Swing Line Loans, Tranche A Loans and Reimbursement Term Loans
        (if any), the rate per annum set forth below under the relevant column
        heading below opposite the Level then in effect:

<PAGE>

                ========================================================
                                               Applicable Margin
                                   -------------------------------------
                                        Eurocurrency         ABR Loans
                     Level                 Loans
                --------------------------------------------------------
                    Level I                2.50%               1.50%
                    Level II               2.75%               1.75%
                    Level III              3.00%               2.00%
                    Level IV               3.25%               2.25%
                    Level V                3.50%               2.50%
                =========================================================

          Notwithstanding the foregoing, (y) the "Applicable Margin" from time
          to time in effect for Swing Line Loans shall be the rate which would
          then be applicable to Revolving Credit Loans which are ABR Loans and
          (z) for each day prior to the date which is six months following the
          Closing Date, the Level in effect shall be deemed to be Level V."; and

          "`Credit Documents': this Agreement, the Notes, the German L/C, the
            ----------------
          Applications, the Intercreditor Agreement and the Security Documents."

          (b) by adding the following new definitions in the appropriate
          alphabetical order:

          "`Additional Indebtedness': Indebtedness of the Primary Borrower
            -----------------------
          having terms and conditions not less favorable to the Primary Borrower
          than those of the Convertible Notes. Such Indebtedness may be secured
          and guaranteed to the same extent as the Convertible Notes so long as
          (a) such Indebtedness is held by one or more members of the CD&R Group
          and (b) the holder or holders of such Indebtedness be or become party
          to the Intercreditor Agreement as contemplated by paragraph 18(d) of
          the Intercreditor Agreement on or prior to the date on which such
          Indebtedness is incurred.

          "`Adjustment Period': the period from the Amendment Effective Date to
            -----------------
          the first date on or after June 30, 2003 on which no Default or Event
          of Default has occurred and is continuing.

          "`Amendment Effective Date': the date on which the Second Amendment to
            ------------------------
          this Agreement becomes effective in accordance with its terms.

          "`Convertible Note Collateral Agreement: the Guarantee and Collateral
            -------------------------------------
          Agreement, dated on or about the Amendment Effective Date, among the
          Guarantor, the Primary Borrower and each Subsidiary Guarantor, as such
          agreement may be amended, supplemented or otherwise modified from time
          to time in accordance with subsection 14.12.

          "`Convertible Note Documents': the Investment Agreement, dated on or
            --------------------------
          about the Amendment Effective Date, among the Guarantor, the Primary
          Borrower and the

                                        2

<PAGE>
               Investor, as such agreement may be amended, supplemented or
               otherwise modified from time to time in accordance with
               subsection 14.12 and the Convertible Note Collateral Agreement.

               "`Convertible Notes': the convertible notes issued by the Primary
                 -----------------
               Borrower (a) to the Investor within 15 Business Days of the
               Amendment Effective Date pursuant to the Convertible Note
               Documents or (b) from time to time in payment of interest or
               other amounts owing in respect of any Convertible Note, as the
               same may be amended, supplemented or otherwise modified from time
               to time in accordance with subsection 14.12.

               "`Inactive Subsidiaries': each Subsidiary of the Primary Borrower
                 ---------------------
               listed on Part I of Schedule 10.15 so long as such Subsidiary is
               in compliance with Section 14.15.

               "`Intercreditor Agreement': the Intercreditor Agreement,
                 -----------------------
               substantially in the form of Exhibit L, dated as of the Amendment
               Effective Date, among the Investor, the Primary Borrower, the
               Subsidiary Guarantors and the Administrative Agent, as the same
               may be amended from time to time in accordance with this
               Agreement."

               "`Investor':  Clayton, Dubilier & Rice Fund VI Limited
                 --------
               Partnership."

               (c) by deleting the phrase "14.5(h), (j) or (k)" where it appears
in the definition of the term "Reinvested Amount" and inserting in lieu thereof
the phrase "14.5(f), (h), (j) or (k) (or, at any time during the Adjustment
Period, 14.5(c), (f), (h), (j) or (k))".

               Section 3. Amendment to Subsection 9.5 (Mandatory Reduction of
                          ---------------------------------------------------
Commitments and Prepayments). Subsection 9.5 of the Credit Agreement is hereby
---------------------------
amended by inserting the following new paragraph (h) at the end thereof:

              "(h) Notwithstanding the foregoing, during the Adjustment Period
              the foregoing paragraphs (c) and (d) of this subsection 9.5 shall
              be deemed to be replaced in their entirety respectively by
              paragraphs (c) and (d) set forth on Exhibit J for all purposes of
              this Agreement."

                                       3

<PAGE>
          Section 4. Amendment to Subsection 10.2 (No Change). Subsection 10.2
                     ---------------------------------------
of the Credit Agreement is hereby amended by deleting the date "March 31, 1999"
and substituting in lieu thereof the date "September 30, 2001".

          Section 5. Amendment to Subsection 10.15 (Subsidiaries). Subsection
                     -------------------------------------------
10.15 of the Credit Agreement is hereby amended by deleting such subsection in
its entirety and inserting in lieu thereof the following:

     "10.15 Subsidiaries. On the Amendment Effective Date, the Subsidiaries of
            ------------
     the Primary Borrower, their jurisdictions of organization and the ownership
     interests thereof shall be as set forth on Schedule 10.15."

          Section 6. Amendment to Subsection 12.1 (Financial Statements).
                     --------------------------------------------------
Subsection 12.1 of the Credit Agreement is hereby amended by (i) deleting the
word "and" following paragraph (a) thereof, (ii) inserting the word "and" after
paragraph (b) thereof and (iii) deleting the text following clause (b) thereof
in its entirety and inserting in lieu thereof the following:

     "(c) during the Adjustment Period, as soon as available, but in any event
     not later than 45 days after the end of each calendar month, commencing
     with the month of December 2001, financial data for such month summarizing
     the results of operations of the Guarantor and its consolidated
     Subsidiaries as at the end of such month, certified by a Responsible
     Officer as being fairly stated in all material respects;

     all such financial statements and data shall be complete and correct in all
     material respects and shall be prepared in reasonable detail and in
     accordance with GAAP applied consistently throughout the periods reflected
     therein and with prior periods (except as approved by a Responsible Officer
     and disclosed therein, and except, in the case of any financial statements
     delivered pursuant to paragraphs (b) and (c) of subsection 12.1, for the
     absence of certain notes)."

          Section 7. Amendment to Subsection 12.9 (Additional Collateral).
                     ---------------------------------------------------
Subsection 12.9 of the Credit Agreement is hereby amended by deleting paragraph
(d) thereof in its entirety and inserting in lieu thereof the following new
paragraph (d):

     "(d) Notwithstanding anything to the contrary contained herein, (i) no
     Subsidiary of the Primary Borrower that had consolidated assets as of the
     most recently completed fiscal quarter or consolidated gross revenues as of
     the most recently completed period of four consecutive fiscal quarters, of
     less than $10,000,000 shall be required to comply with the provisions of
     this subsection 12.9 (nor shall the Primary Borrower or any of its
     Subsidiaries be required to comply with the provisions of this subsection
     12.9 with respect to any such Subsidiary) until the date that is 45 days
     after the Amendment Effective Date and (ii) the Primary Borrower and its
     Subsidiaries shall not be required to (x) make the representations and
     warranties set forth in Section 4 of the Collateral Agreement or
     subsections 10.4, 10.5, 10.17 or 10.19 of this Agreement or (y) comply with
     the covenants set forth in Sections 5.2.1, 5.2.2, 5.2.4, 5.2.5(i),
     5.2.5(ii), 5.2.6, 5.2.7, 5.2.8(b), 5.2.9, 5.2.10, 5.3.1, 5.3.2(iii), 5.3.3
     or 6.7 of the Collateral Agreement with respect to any Inactive Subsidiary
     or any property or

                                       4

<PAGE>

          assets thereof so long as such Subsidiary is an Inactive Subsidiary,
          and the exclusions of Inactive Subsidiaries from representations and
          warranties and covenants described in this clause (ii) shall be given
          effect by appropriate modifications (which shall be reasonably
          acceptable to the Administrative Agent and the Primary Borrower) to
          the Assumption Agreement entered into by the Inactive Subsidiaries
          pursuant to Section 8.15 of the Collateral Agreement."

            Section 8.  Amendment to Subsection 13.1 (Minimum Interest Coverage
                        -------------------------------------------------------
Ratio). Subsection 13.1 of the Credit Agreement is hereby amended by deleting
-----
from the table references to fiscal quarters ending December 31, 2001, March 31,
2002, June 30, 2002, September 30, 2002, December 31, 2002 and March 31, 2003
and the ratios set forth opposite such fiscal quarters.

            Section 9.  Amendment to Subsection 13.2 (Maximum Leverage Coverage
                        -------------------------------------------------------
Ratio). Subsection 13.2 of the Credit Agreement is hereby amended by deleting
-----
from the table references to fiscal quarters ending December 31, 2001, March 31,
2002, June 30, 2002, September 30, 2002, December 31, 2002 and March 31, 2003
and the ratios set forth opposite such fiscal quarters.

            Section 10. New Section 13.3 (Minimum EBITDA). Section 13 of the
                        --------------------------------
Credit Agreement is hereby further amended by inserting the following new
Subsection 13.3:

          "Section 13.3 Minimum EBITDA. Permit EBITDA for any period of
                        --------------
consecutive fiscal quarters of the Guarantor set forth below to be less than the
amount set forth opposite such period:

                  Fiscal Periods                            EBITDA
                  --------------                            ------

                  Two fiscal quarters ending 9/30/02        negative $10,000,000

                  Three fiscal quarters ending 12/31/02     $17,000,000

                  Four fiscal quarters ending 3/31/03       $40,000,000"

            Section 11. New Section 13.4 (Minimum Liquidity). Section 13 of the
                        -----------------------------------
Credit Agreement is hereby further amended by inserting the following new
Subsection 13.4:

          "Section 13.4 Minimum Liquidity. During the Adjustment Period, permit
                        -----------------
          the sum of (a) cash and Cash Equivalents of the Primary Borrower and
          its Subsidiaries, plus (b) the aggregate Available Revolving Credit
                            ----
          Commitment, to be less than $25,000,000 at any time."

            Section 12. Amendment to Section 14 (Negative Covenants). Section 14
                        -------------------------------------------
of the Credit Agreement is hereby amended by inserting the following proviso at
the end of the lead-in paragraph to such Section:

                                       5

<PAGE>

          "; provided, however, that during the Adjustment Period, the
             --------  -------
          subsections set forth on Exhibit K shall be deemed to replace in their
          entirety the following subsections of this Section 14 for all purposes
          of this Agreement:"

          Section 13. Amendment to Subsection 14.1 (Indebtedness). Subsection
                      ------------------------------------------
14.1 of the Credit Agreement is hereby amended by deleting paragraph (e) thereof
in its entirety and inserting in lieu thereof the following new paragraph (e):

          "(e) Indebtedness of the Primary Borrower on account of (i) the Senior
          Subordinated Notes, (ii) the Convertible Notes and (iii) Additional
          Indebtedness; provided that the aggregate principal amount at any time
                        --------
          outstanding of Convertible Notes and Additional Indebtedness shall not
          exceed $125,000,000 plus the amount of any interest accreted or paid
          in kind in respect thereof."

          Section 14. Amendment to Subsection 14.2 (Liens). Subsection 14.2 of
                      -----------------------------------
the Credit Agreement is hereby amended by (i) deleting the word "and" at the end
of paragraph (q) thereof, (ii) inserting a semicolon followed by the word "and"
after paragraph (r) thereof and (iii) inserting the following new clause (s) at
the end thereof:

          "(s) Liens on the Collateral securing the Convertible Notes, any
          Additional Indebtedness or any Guarantee Obligations in respect of any
          Convertible Notes or Additional Indebtedness; provided that (i) any
                                                        --------
          such Liens are junior in priority to the Liens created by the Security
          Documents, (ii) the holder of the Indebtedness secured by such Lien
          has become a party to the Intercreditor Agreement pursuant to
          paragraph 18(d) of the Intercreditor Agreement and (iii) any such
          Liens are granted pursuant to the Convertible Note Collateral
          Agreement or another security document that is substantially
          equivalent to a Security Document."

          Section 15. Amendment to Subsection 14.3 (Guarantee Obligations).
                      ---------------------------------------------------
Subsection 14.3 of the Credit Agreement is hereby amended by (i) deleting the
word "and" at the end of paragraph (o) thereof, (ii) inserting a semicolon
followed by the word "and" after paragraph (p) thereof and (iii) inserting the
following new clause (q) at the end thereof:

          "(q) Guarantee Obligations of Subsidiary Guarantors in respect of
          Convertible Notes and the Additional Indebtedness; provided that (to
                                                             --------
          the extent such Guarantee Obligations are secured by Liens incurred in
          accordance with subsection 14.2(s)) the holder of Indebtedness
          guaranteed thereby has become a party to the Intercreditor Agreement
          pursuant to paragraph 18(d) of the Intercreditor Agreement."

          Section 16. Amendment to Subsection 14.6 (Restricted Payments).
                      -------------------------------------------------
Subsection 14.6 of the Credit Agreement is hereby amended by inserting the
phrase "or Convertible Note Documents" after (a) the phrase "other Credit
Documents" in clause (iii) of paragraph (c) thereof and (b) the phrase "Existing
Transaction Documents" in clause (ii) of paragraph (f) thereof.

          Section 17. Amendment to Subsection 14.7 (Capital Expenditures).
                      --------------------------------------------------
Subsection 14.7 to the Credit Agreement is hereby by amended as follows:

                                        6

<PAGE>

          (a) by deleting the amount set forth opposite the fiscal year 2002 and
replacing it with "$45,000,000";

          (b) by deleting the amount set forth opposite the fiscal year 2003 and
replacing it with "$45,000,000"; and

          (c) by deleting the provisos to such subsection and inserting in lieu
thereof the following:

     "provided, however, that (w) the amount set forth above for fiscal year
      --------  -------
     2002 shall not be increased by virtue of any carry-over, (x) the amount set
     forth above for fiscal year 2003 shall be increased by 100% of the amount
     set forth above for fiscal year 2002 not expended during fiscal year 2002,
     (y) except as provided in the foregoing clauses (w) and (x) of this
     proviso, any portion of any amount set forth above which is not expended in
     the fiscal year for which it is permitted above may be carried-over to
     increase the amount permitted for the next fiscal year of the Primary
     Borrower and shall be deemed to be the first amounts expended in such next
     fiscal year, and (z) except as permitted by the foregoing clause (x) of
     this proviso, none of the amounts set forth above shall be increased by
     more than 50% of such amount by virtue of any carry-over."

          Section 18. Amendment to Subsection 14.12 (Optional Payments).
                      ------------------------------------------------
Subsection 14.12 of the Credit Agreement is hereby amended by deleting the word
"or" at the end of clause (b) thereof and replacing such word with a comma and
(ii) deleting the period at the end of subsection 14.12 and replacing such
period with a comma followed by the following:

     "(d) make any optional payment, prepayment, repurchase or redemption of the
     Convertible Notes or the Additional Indebtedness or any cash payment of
     interest in respect of the Convertible Notes or any Additional Indebtedness
     or make any optional payments on account of or for a sinking or other
     analogous fund for the repurchase, redemption, defeasance or other
     acquisition of Convertible Notes or any Additional Indebtedness (except to
     the extent any payment is made in equity of the Guarantor or rights to
     acquire any such equity); (e) make any amendment, supplement, modification
     or waiver of any of the terms of the Convertible Notes, the Convertible
     Note Documents or any Additional Indebtedness (i) which (except to the
     extent any payment is made in equity of the Guarantor or rights to acquire
     any such equity) shortens the fixed maturity of or increases the aggregate
     principal amount thereof to an amount in excess of $125,000,000 plus the
     amount of any interest accreted or paid in kind in respect thereof, or
     increases the rate or shortens the time of payment of interest on, or
     increases the amount or shortens the time of payment of any principal or
     premium payable, at a date fixed for prepayment or by acceleration or
     otherwise prior to maturity thereof or increases the amount of, or
     accelerates the time of payment of, any fees or other amounts payable in
     connection therewith to any holder thereof (ii) which relates to any
     material affirmative or negative covenants or any events of default or
     remedies thereunder and the effect of which is to subject the Primary
     Borrower, or any of its Subsidiaries, to any more onerous or more
     restrictive provisions; or (iii) which otherwise adversely affects the
     interests of the Lenders under the Intercreditor Agreement or the interests
     of the Lenders

                                       7

<PAGE>

         hereunder in any material respect; provided that the foregoing will not
         prohibit or restrict any amendment, supplement, modification or waiver
         to provide the Convertible Notes or Additional Indebtedness with the
         benefit of any Lien on Collateral permitted by subsection 14.2(s), or
         any Guarantee Obligation permitted by subsection 14.3(q); or (f) in the
         event of the occurrence of a Change of Control, repurchase the
         Convertible Notes, unless the Primary Borrower shall have (i) made, or
         caused to have been made, payment in full of the Loans, all
         Reimbursement Obligations and any other amounts then due and owing to
         any Lender or the Administrative Agent hereunder and under any Note and
         cash collateralized the Domestic L/C Obligations on terms reasonably
         satisfactory to the Administrative Agent or (ii) made, or caused to
         have been made, an offer to pay the Loans, all Reimbursement
         Obligations and any amounts then due and owing to each Lender and the
         Administrative Agent hereunder and under any Note and to cash
         collateralize the Domestic L/C Obligations in respect of each Lender
         and shall have made, or caused to have been made, payment in full
         thereof to each such Lender or the Administrative Agent which has
         accepted such offer and cash collateralized the Domestic L/C
         Obligations in respect of each such Lender which has accepted such
         offer."

           Section 19. New Subsection 14.15 (Limitation on Inactive
                       --------------------------------------------
Subsidiaries). Section 14 of the Credit Agreement is hereby amended by adding
------------
the following new subsection thereto:

          "14.15 Limitation on Inactive Subsidiaries. At any time after the date
                 -----------------------------------
          that is 45 days after the Amendment Effective Date, (a) in the case of
          any Inactive Subsidiary (i) conduct, transact or otherwise engage in,
          or commit to conduct, transact or otherwise engage in, any business or
          operations outside the ordinary course of business, (ii) incur,
          create, assume or suffer to exist any material Indebtedness (other
          than Indebtedness existing on the Amendment Effective Date), (iii)
          incur, create or assume any other material liability or material
          financial obligation (other than any such liability or financial
          obligation existing on the Amendment Effective Date) or (iv) own,
          lease, manage or otherwise operate any material properties or assets
          (other than property or assets owned or leased on the Amendment
          Effective Date), (b) make any Investment in any such Inactive
          Subsidiary other than in connection with any activity permitted by the
          preceding clause (a) (including without limitation to pay or perform
          any Indebtedness, liability or obligation permitted thereby), (c)
          dispose of any material assets or property to any such Inactive
          Subsidiary, unless, in the case of clauses (a), (b) and (c), within 30
          days of taking any such actions, the Primary Borrower or its
          Subsidiary, as the direct parent of such Inactive Subsidiary, as the
          case may be, and such Inactive Subsidiary execute and deliver a
          supplement to the Assumption Agreement relating to such Inactive
          Subsidiary making the representations and agreeing to the covenants it
          would have previously made and agreed to with respect to such Inactive
          Subsidiary pursuant to this Agreement and the Collateral Agreement but
          for the provisions of subsection 12.9(d)(ii). It is understood and
          agreed that any Inactive Subsidiary that takes any action described in
          clauses (a), (b) and (c) of the foregoing sentence shall cease to be
          an Inactive Subsidiary and be deemed to be an Active Subsidiary for
          all purposes of this Agreement and the other Credit Documents on the
          date that is 30 days after the taking of such action.

                                       8

<PAGE>

          Section 20. Amendment to Schedule 10.15. The Credit Agreement is
                      ---------------------------
hereby amended by deleting Schedule 10.15 in its entirety and inserting in lieu
thereof Schedule 10.15 hereto.

          Section 21. New Exhibits. The Credit Agreement is hereby amended by
                      ------------
adding Exhibit K, Exhibit J and Exhibit L hereto as Exhibit K, Exhibit J and
Exhibit L, respectively, thereto.

          Section 22. Conditions to Effectiveness; Condition Subsequent. This
                      -------------------------------------------------
Amendment shall become effective on the date (the "Amendment Effective Date") on
                                                   ------------------------
which the Administrative Agent shall have received:

          (a) this Amendment, duly executed and delivered by each of the
Borrowers, each Subsidiary Guarantor and the Majority Lenders;

          (b) a copy of each Convertible Note Document duly executed and
delivered by the parties thereto; provided the continued effectiveness of this
                                  --------
Amendment shall be subject to the condition subsequent that, within 15 Business
Days of the Amendment Effective Date, the Administrative Agent shall have
received reasonably satisfactory evidence that the Primary Borrower has received
at least $75,000,000 in gross cash proceeds from the issuance of the Convertible
Notes;

          (c) the Intercreditor Agreement, duly executed and delivered by the
holder of the Convertible Notes, the Primary Borrower, each Subsidiary Guarantor
and the Administrative Agent;

          (d) an amendment fee, for the account of the Lenders that have
delivered an executed signature page to this Amendment to the Administrative
Agent or its counsel no later than 5:00 p.m., New York City time, on December
17, 2001, in an amount equal to 0.25% of the aggregate amount (without
duplication) of the Commitments in effect and Loans outstanding of such Lenders;
and

          (e) an executed legal opinion of Debevoise & Plimpton and the general
counsel of the Primary Borrower, in each case covering such matters relating to
the transactions contemplated hereby as shall be reasonably requested by the
Administrative Agent.

          Section 23. Representation and Warranties; No Defaults or Events of
                      -------------------------------------------------------
Default. The Primary Borrower represents and warrants to the Administrative
-------
Agent and the Lenders that as of the Amendment Effective Date, after giving
effect to this Amendment, no Default or Event of Default has occurred and is
continuing, and the representations and warranties made by the Borrowers in or
pursuant to the Credit Agreement or any other Loan Document are true and correct
in all material respects on and as of the Amendment Effective Date as if made on
such date (except to the extent that any such representations and warranties
expressly relate to an earlier date, in which case such representations and
warranties were true and correct in all material respects on and as of such
earlier date).

          Section 24. Payment of Expenses. The Primary Borrower agrees to pay or
                      -------------------
reimburse the Administrative Agent for all of its reasonable out-of-pocket costs
and expenses

                                        9

<PAGE>

incurred in connection with this Amendment, any other documents prepared in
connection herewith and the transactions contemplated hereby, including, without
limitation, the reasonable fees and disbursements of counsel to the
Administrative Agent.

          Section 25. Continuing Effect of the Credit Agreement. This Amendment
                      -----------------------------------------
shall not constitute an amendment or waiver of or consent to any provision of
the Credit Agreement not expressly referred to herein and shall not be construed
as an amendment, waiver or consent to any action on the part of the Borrowers
that would require an amendment, waiver or consent of the Administrative Agent
or the Lenders except as expressly stated herein. Except as expressly amended
hereby, the provisions of the Credit Agreement are and shall remain in full
force and effect in accordance with its terms.

          Section 26. Counterparts. This Amendment may be executed by one or
                      ------------
more of the parties to this Amendment on any number of separate counterparts
(including by facsimile), and all of said counterparts taken together shall be
deemed to constitute one and the same instrument.

          Section 27. GOVERNING LAW. THIS AMENDMENT AND THE RIGHTS AND
                      -------------
OBLIGATIONS OF THE PARTIES UNDER THIS AMENDMENT SHALL BE GOVERNED BY, AND
CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.

            [The remainder of this page is intentionally left blank.]

                                       10

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be duly executed and delivered by their respective proper and duly authorized
officers as of the day and year first above written.

                                                ACTERNA LLC

                                                By: _________________________
                                                      Name:
                                                      Title:

                                                ACTERNA INTERNATIONAL GMBH

                                                By: ____________________________
                                                      Name:
                                                      Title:

                                       11

<PAGE>

                                                ___________________________
                                                (NAME OF LENDER)

                                                By: ____________________________
                                                      Name:
                                                      Title:

                                       12

<PAGE>
                           ACKNOWLEDGMENT AND CONSENT

         Each of the undersigned as guarantors under the Guarantee and
Collateral Agreement, dated as of May 23, 2000, made by the undersigned in favor
of the Administrative Agent, for the benefit of the Lenders, hereby (a) consents
to the transactions contemplated by this Amendment and (b) acknowledges and
agrees that the guarantees (and grants of collateral security therefor)
contained in such Guarantee and Collateral Agreement are, and shall remain, in
full force and effect after giving effect to this Amendment.

                                                ACTERNA BUSINESS TRUST

                                                By: ____________________________
                                                    Name:
                                                    Title:

                                                AIRSHOW, INC.

                                                By: ____________________________
                                                    Name:
                                                    Title:

                                                APPLIED DIGITAL ACCESS, INC.

                                                By: ____________________________
                                                    Name:
                                                    Title:

                                                DA VINCI SYSTEMS, INC.

                                                By: ____________________________
                                                    Name:
                                                    Title:

                                       13

<PAGE>

                                                ITRONIX CORPORATION

                                                By: ____________________________
                                                    Name:
                                                    Title:

                                                SIERRA DESIGN LABS

                                                By: ____________________________
                                                    Name:
                                                    Title:

                                                WANDEL & GOLTERMANN, INC.

                                                By: ____________________________
                                                    Name:
                                                    Title:

                                                WAVETEK WANDEL GOLTERMANN LLC

                                                By: ____________________________
                                                    Name:
                                                    Title:

                                                WAVETEK U.S. INC.

                                                By: ____________________________
                                                    Name:
                                                    Title:

                                       14

<PAGE>

                                                                       EXHIBIT J
                                                         to the Credit Agreement

                         Adjusted Mandatory Prepayments
                         ------------------------------

          (c) If, on any date during the Adjustment Period, the Primary Borrower
or any of its Subsidiaries shall incur any Indebtedness (excluding Indebtedness
permitted pursuant to clauses (a) though (e) and (g) through (p) of subsection
14.1), as promptly as is practicable (and, in any event, within one Business Day
following the receipt thereof), the Primary Borrower shall give notice thereof
to the Administrative Agent, and on the applicable Mandatory Prepayment Date,
the Loans shall be prepaid and the Commitments shall be reduced by the amount
equal to the aggregate amount of Net Proceeds received from such incurrence of
indebtedness. Any repayment of Loans and reduction of Commitments required by
this subsection 9.5(c) shall be made in accordance with the provisions of
subsection 9.5(f).

          (d) If, on any date during the Adjustment Period, the Primary Borrower
or any of its Subsidiaries shall receive Net Proceeds from (i) the sale,
transfer or other disposition by the Primary Borrower, or any of its
Subsidiaries of any real or personal, tangible or intangible, property of the
Primary Borrower or such Subsidiary (including, without limitation, any Capital
Stock of a Subsidiary of the Primary Borrower) to any Person (other than to the
Primary Borrower or any of its Subsidiaries) pursuant to subsection 14.5(c),
(f), (h), (j) or (k) or (ii) the recovery by the Primary Borrower or any of its
Subsidiaries of amounts owing to it under property insurance policies if the
Primary Borrower and its Subsidiaries have not commenced replacement of the
property on account of which such amounts were paid within one year of the later
of the date of the casualty to, or condemnation of, such property or the receipt
of such Net Proceeds, the Primary Borrower shall give notice thereof to the
Administrative Agent, and on the applicable Mandatory Prepayment Date, the Loans
shall be prepaid and the Commitments reduced by the aggregate amount of such Net
Proceeds (minus the Reinvested Amount related to thereto); provided, however,
                                                           --------  -------
that in no event shall the aggregate amount of all Reinvested Amounts subtracted
from such Net Proceeds received in connection with asset dispositions described
in the foregoing clause (i) exceed $10,000,000 in any fiscal year of the Primary
Borrower. Any Notice of Prepayment given pursuant to this subsection 9.5(d)
shall be given as promptly as practicable (and in any event, within three
Business Days) following the date of receipt of any such Net Proceeds (except
that if any such Net Proceeds are eligible to be reinvested in accordance with
the definition of the term "Reinvested Amount" in subsection 1.1 and the Primary
Borrower has not elected to reinvest such proceeds, such Notice of Prepayment
shall be given on the earlier of (1) the date on which the certificate of a
Responsible Officer of the Primary Borrower to such effect is delivered to the
Administrative Agent in accordance with such definition and (2) the last day of
the period within which a certificate setting forth such election is required to
be delivered in accordance with such definition).

                                       15

<PAGE>

                                                                        EXHBIT K
                                                         to the Credit Agreement

                           Adjusted Negative Covenants
                           ---------------------------

          Section 14.1 Limitation on Indebtedness. Create, incur, assume or
suffer to exist any Indebtedness (including, in any event, any preferred stock
which is mandatorily redeemable prior to the scheduled maturity of the Loans,
other than any such stock held by Management Investors), except:

               (a)  Indebtedness of the Primary Borrower and its Subsidiaries
          under this Agreement and the other Credit Documents;

               (b)  Indebtedness of the Primary Borrower to any Subsidiary and
          of any Subsidiary to the Primary Borrower or any other Subsidiary;
          provided that the aggregate principal amount of Indebtedness of
          Foreign Subsidiaries to the Primary Borrower and any Domestic
          Subsidiary shall not exceed $35,000,000 at any time outstanding;

               (c)  Indebtedness of the Primary Borrower and its Subsidiaries
          incurred to finance or refinance the acquisition of fixed or capital
          assets (whether pursuant to a loan, a Financing Lease or otherwise)
          and any other Financing Leases in an aggregate principal amount not
          exceeding as to the Primary Borrower and its Subsidiaries $15,000,000
          at any time outstanding;

               (d)  Indebtedness of a Person which becomes a Subsidiary after
          the date hereof, provided that (i) such indebtedness existed at the
                           --------
          time such Person became a Subsidiary and was not created in
          anticipation thereof and (ii) immediately after giving effect to the
          acquisition of such Person by the Primary Borrower no Default or Event
          of Default shall have occurred and be continuing;

               (e)  Indebtedness of the Primary Borrower on account of (i) the
          Senior Subordinated Notes, (ii) the Convertible Notes and (iii)
          Additional Indebtedness; provided that the aggregate principal amount
                                   --------
          at any time outstanding of Convertible Notes and Additional
          Indebtedness shall not exceed $125,000,000 plus the amount of any
          interest accreted or paid in kind in respect thereof;

               (f)  additional Indebtedness of the Primary Borrower or any of
          its Subsidiaries which is subordinated to the obligations of the
          Credit Parties hereunder not exceeding $50,000,000 in aggregate
          principal amount at any one time outstanding; provided that (i) any
                                                        --------
          such Indebtedness shall have terms and conditions which are not
          materially more burdensome to the Credit Parties than, and
          subordination provisions substantially similar to, the Senior
          Subordinated Notes, (ii) the aggregate principal amount of
          Indebtedness owing by Subsidiaries of the Primary Borrower that are
          not Subsidiary Guarantors in reliance upon the provisions of this
          clause (f) and subsection 14.1(p) shall not exceed $20,000,000 at any
          one time outstanding, and (iii) the proceeds thereof are applied
          toward prepayment of Loans and reduction of Commitments to the extent
          required by Section 9.5(c);

               (g)  [intentionally omitted];

                                       16

<PAGE>

               (h) to the extent that any Guarantee Obligation permitted under
          subsection 14.3 constitutes Indebtedness, such Indebtedness;

               (i) Indebtedness of Foreign Subsidiaries of the Primary Borrower
          for working capital purposes (including in respect of overdrafts and
          letters of credit issued for the account of any Foreign Subsidiary)
          not exceeding, as to all such Foreign Subsidiaries, $35,000,000 in
          aggregate principal amount at any one time outstanding;

               (j) Indebtedness to finance the general working capital needs of
          the Primary Borrower and its Subsidiaries incurred after the
          Termination Date in an aggregate principal amount not to exceed the
          amount of the Revolving Credit Commitments as of the Closing Date,
          provided that (i) the Tranche A Loans shall have been repaid in full
          --------
          and the Revolving Credit Commitment shall have been or shall
          concurrently be terminated and the Revolving Credit Loans, the Swing
          Line Loans and the Reimbursement Obligations shall have been or shall
          concurrently be repaid in full and any outstanding Domestic L/C
          Obligations shall have been or shall concurrently be cash
          collateralized on terms reasonably satisfactory to the Administrative
          Agent and (ii) the terms and conditions of such replacement working
          capital facility shall be substantially similar to, or otherwise not
          less favorable to the Primary Borrower in any material respect than,
          the analogous provisions applicable to the Revolving Credit
          Commitments;

               (k) Indebtedness of the Primary Borrower or any of its
          Subsidiaries incurred to finance insurance premiums in the ordinary
          course of business;

               (l) Indebtedness of any Foreign Subsidiary of the Primary
          Borrower fully supported on the date of the incurrence thereof by a
          Foreign Backstop Letter of Credit;

               (m) Indebtedness arising from the honoring of a check, draft or
          similar instrument against insufficient funds; provided that such
                                                         --------
          Indebtedness is extinguished within two Business Days of its
          incurrence;

               (n) to the extent that any Indebtedness may be incurred or arise
          thereunder, Indebtedness of the Primary Borrower and any of its
          Subsidiaries under any Hedging Arrangements;

               (o) the German Mortgage Debt and any Indebtedness described in
          Schedule 11.1(m) and any refinancing thereof; and

               (p) additional unsecured Indebtedness not exceeding $20,000,000
          in aggregate principal amount at any one time outstanding.

          For the purposes of determining compliance with subsection 14.1(i) and
(p), the amount of any Indebtedness denominated in any currency other than
Dollars shall be calculated based on customary currency exchange rates in
effect, in the case of such Indebtedness incurred (in respect of term debt) or
committed (in respect of revolving debt) on or prior to the Closing

                                       17

<PAGE>

Date, on the Closing Date and, in the case of such Indebtedness incurred (in
respect of term debt) or committed (in respect of revolving debt) after the
Closing Date, on the date that such Indebtedness was incurred (in respect of
term debt) or committed (in respect of revolving debt).

               Section 14.2 Limitation on Liens. Create, incur, assume or suffer
                            -------------------
to exist any Lien upon any of its property, assets or revenues, whether now
owned or hereafter acquired, except for:

                    (a) Liens for taxes, assessments and similar charges not yet
               delinquent or the nonpayment of which in the aggregate would not
               reasonably be expected to have a Material Adverse Effect, or
               which are being contested in good faith by appropriate
               proceedings, provided that adequate reserves with respect thereto
                            --------
               are maintained on the books of the Guarantor, the Primary
               Borrower or their Subsidiaries, as the case may be, in conformity
               with GAAP (or, in the case of Foreign Subsidiaries, generally
               accepted accounting principles in effect from time to time in
               their respective jurisdictions of incorporation);

                    (b) carriers', warehousemen's, mechanics', materialmen's,
               repairmen's or other like Liens arising in the ordinary course of
               business which are not overdue for a period of more than 60 days
               or which are being contested in good faith by appropriate
               proceedings;

                    (c) pledges, deposits or other Liens in connection with
               workers' compensation, unemployment insurance and other social
               security benefits or other insurance related obligations
               (including, without limitation, pledges or deposits or other
               Liens securing liability to insurance carriers under insurance or
               self-insurance arrangements);

                    (d) Liens to secure the performance of bids, contracts
               (other than for borrowed money), obligations for utilities,
               leases, statutory obligations, surety and appeal bonds,
               performance bonds, judgment and like bonds, replevin and similar
               bonds, reimbursement obligations with respect to letters of
               credit issued for the account of any Foreign Subsidiary and
               otherwise permitted hereunder, and other obligations of a like
               nature incurred in the ordinary course of business;

                    (e) zoning restrictions, easements, rights-of-way,
               restrictions, other similar encumbrances incurred in the ordinary
               course of business and minor irregularities of title which do not
               materially interfere with the ordinary conduct of the business of
               the Primary Borrower and its Subsidiaries taken as a whole;

                    (f) Liens securing or consisting of Indebtedness of the
               Primary Borrower and its Subsidiaries permitted by subsection
               14.1(c) or 14.1(g), provided that (i) such Liens shall be created
                                   --------
               prior to or substantially simultaneously with or within six
               months of the acquisition thereby financed or the date of the
               incurrence or assumption of such Indebtedness and, (ii) such
               Liens do not at any time encumber any property other than the
               property financed by such Indebtedness and, in the case of
               Indebtedness assumed in connection with

                                       18

<PAGE>

               any acquisition, the property subject thereto immediately prior
               to such acquisition;

                    (g) Liens on the property or assets of a Person which
               becomes a Subsidiary after the date hereof securing Indebtedness
               permitted by subsection 14.1(d), provided that (i) such Liens
                                                --------
               existed at the time such Person became a Subsidiary and were not
               created in anticipation thereof and (ii) any such Lien is not
               spread to cover any property or assets of such Person after the
               time such Person becomes a Subsidiary;

                    (h) Liens (not otherwise permitted hereunder) which secure
               obligations not exceeding (as to the Primary Borrower and all
               Subsidiaries in the aggregate) $10,000,000 in aggregate amount at
               any time outstanding;

                    (i) Liens created pursuant to the Security Documents;

                    (j) Liens of landlords or of mortgages of landlords arising
               by operation of law or pursuant to the terms of real property
               leases, provided that the rental payments secured thereby are not
                       --------
               yet due and payable;

                    (k) Liens arising by reason of any judgment, decree or order
               of any court or other Governmental Authority, if appropriate
               legal proceedings which may have been duly initiated for the
               review of such judgment, decree or order, are being diligently
               prosecuted and shall not have been finally terminated or the
               period within which such proceedings may be initiated shall not
               have expired;

                    (l) Liens existing on assets or properties at the time of
               the acquisition thereof by the Primary Borrower or any of its
               Subsidiaries which do not materially interfere with the use,
               occupancy, operation and maintenance of structures existing on
               the property subject thereto or extend to or cover any assets or
               properties of the Primary Borrower or such Subsidiary other than
               the assets or property being acquired;

                    (m) Liens securing Guarantee Obligations permitted under
               subsection 14.3(j)(i) or (ii);

                    (n) any encumbrance or restriction (including, without
               limitation, put and call agreements) with respect to the Capital
               Stock of any joint venture or similar arrangement pursuant to the
               joint venture or similar agreement with respect to such joint
               venture or similar arrangement, provided that no such encumbrance
                                               --------
               or restriction affects in any way the ability of the Primary
               Borrower or any of its Subsidiaries to comply with subsection
               12.9;

                    (o) Liens on property subject to Sale and Leaseback
               Transactions permitted under subsection 14.10 and general
               intangibles related thereto;

                                       19

<PAGE>

         (p) Liens on property of any Foreign Subsidiary of the Primary Borrower
     securing Indebtedness of any Foreign Subsidiary of the Primary Borrower
     permitted by subsection 14.1(i);

         (q) Liens in respect of the German Mortgage Debt; and other Liens in
     existence on the date hereof and listed on Schedule 14.2(q);

         (r) Liens on Intellectual Property and foreign patents, trademarks,
     trade names, service marks, copyrights, technology, know-how and processes
     to the extent such Liens arise from the granting of licenses to use such
     Intellectual Property and foreign patents, trademarks, trade names, service
     marks, copyrights, technology, know-how and processes to any Person in the
     ordinary course of business of the Primary Borrower and its Subsidiaries;
     and

         (s) Liens on the Collateral securing the Convertible Notes, any
     Additional Indebtedness and any Guarantee Obligations in respect of any
     Convertible Notes or Additional Indebtedness; provided that (i) any such
                                                   --------
     Liens are junior in priority to the Liens created by the Security
     Documents, (ii) the holder of Indebtedness secured by such Lien has become
     a party to the Intercreditor Agreement pursuant to paragraph 18(d) of the
     Intercreditor Agreement and (iii) any such Liens are granted pursuant to
     the Convertible Note Collateral Agreement or another security document that
     is substantially equivalent to a Security Document.

     Section 14.3 Limitation on Guarantee Obligations. Create, incur, assume or
                  -----------------------------------
suffer to exist any Guarantee Obligation except:

         (a) [Intentionally omitted];

         (b) guarantees made in the ordinary course of its business by the
     Primary Borrower or any of its Subsidiaries of obligations of the Primary
     Borrower or any of its Subsidiaries, which obligations are otherwise
     permitted under this Agreement;

         (c) the Collateral Agreement or otherwise in respect of Indebtedness
     permitted by subsection 14.1(a);

         (d) Guarantee Obligations incurred after the date hereof in an
     aggregate amount not to exceed $5,000,000 at any one time outstanding;

         (e) Guarantee Obligations in existence on the Amendment Effective Date
     of Indebtedness incurred by any Management Investors in connection with any
     Management Subscription Agreements or other purchases by them of Capital
     Stock of the Guarantor or the Primary Borrower, and any refinancings,
     refundings, extensions or renewals thereof; provided that such amount shall
                                                 --------
     be reduced by the aggregate then outstanding principal amount of loans and
     advances made in reliance upon the provisions of subsection 14.8(l);

                                       20

<PAGE>

         (f) Guarantee Obligations for performance, appeal, judgment, replevin
and similar bonds, letters of credit and suretyship arrangements, all in the
ordinary course of business;

         (g) Guarantee Obligations in respect of indemnification and
contribution agreements expressly permitted by subsection 14.9(iii) or similar
agreements by the Primary Borrower or any of its Subsidiaries;

         (h) Reimbursement Obligations in respect of the Domestic L/Cs and the
German L/C;

         (i) obligations to insurers required in connection with worker's
compensation and other insurance coverage incurred in the ordinary course of
business;

         (j) Guarantee Obligations in respect of third-party loans and advances
to officers or employees of the Guarantor, the Primary Borrower or any of their
Subsidiaries (i) for travel and entertainment expenses incurred in the ordinary
course of business, (ii) for relocation expenses incurred in the ordinary course
of business, or (iii) for other purposes, and in the case of this clause (iii),
in an aggregate amount (as to the Primary Borrower and all its Subsidiaries),
together with the aggregate amount of all Investments permitted under subsection
14.8(c)(ii), of up to $2,000,000 outstanding at any time;

         (k) [intentionally omitted];

         (l) Guarantee Obligations in connection with sales or other
dispositions permitted under subsection 14.5, including indemnification
obligations with respect to leases, and guarantees of collectability in respect
of accounts receivable or notes receivable for up to face value;

         (m) (i) Guarantee Obligations represented by contracts entered into by
the Primary Borrower or any of its Subsidiaries for the purchase of equipment,
inventory and supplies required by the Primary Borrower or such Subsidiary in
the ordinary course of business and (ii) accommodation guarantees for the
benefit of trade creditors of the Primary Borrower or any of its Subsidiaries in
the ordinary course of business;

         (n) [intentionally omitted];

         (o) Guarantee Obligations of the Primary Borrower and its Subsidiaries
under any Hedging Arrangements;

         (p) Guarantee Obligations by Subsidiaries of the Primary Borrower in
respect of the Senior Subordinated Notes as provided in the Senior Subordinated
Note Indenture, which are subordinated as provided in the Senior Subordinated
Note Indenture; and

                                       21

<PAGE>

               (q)  Guarantee Obligations of Subsidiary Guarantors in respect of
          the Convertible Notes and the Additional Indebtedness; provided that
                                                                 --------
          (to the extent such Guarantee Obligations are secured by Liens
          incurred in accordance with subsection 14.2(s)) the holder of
          Indebtedness guaranteed thereby has become a party to the
          Intercreditor Agreement pursuant to paragraph 18(d) of the
          Intercreditor Agreement.

          Section 14.4 Limitation on Fundamental Changes. Enter into any merger,
                       ---------------------------------
consolidation or amalgamation, or liquidate, wind up or dissolve itself (or
suffer any liquidation or dissolution), or convey, sell, lease, assign, transfer
or otherwise dispose of, all or substantially all of its property, business or
assets, except:

               (a)  any Subsidiary of the Primary Borrower may be merged or
          consolidated with or into the Primary Borrower (provided that the
                                                          --------
          Primary Borrower shall be the continuing or surviving corporation) or
          with or into any one or more Wholly Owned Subsidiaries of the Primary
          Borrower (provided that (i) the Wholly Owned Subsidiary or
                    --------
          Subsidiaries shall be the continuing or surviving corporation and (ii)
          if such Subsidiary is a Subsidiary Guarantor, a Subsidiary Guarantor
          shall be the continuing or surviving corporation);

               (b)  any Subsidiary may liquidate or sell, lease, transfer or
          otherwise dispose of any or all of its assets (upon voluntary
          liquidation or otherwise) to the Primary Borrower or any other Wholly
          Owned Subsidiary of the Primary Borrower (provided that if such
                                                    --------
          Subsidiary is a Subsidiary Guarantor such disposition of assets shall
          be to the Primary Borrower or another Subsidiary Guarantors);

               (c)  pursuant to the Transaction or the German Borrower Merger;
          or

               (d)  as expressly permitted by subsection 14.5.

          Section 14.5 Limitation on Sale of Assets. Convey, sell, lease,
                       ----------------------------
assign, transfer or otherwise dispose of any of its property, business or assets
(including, without limitation, receivables and leasehold interests), whether
now owned or hereafter acquired, or, in the case of any Subsidiary, issue or
sell any shares of such Subsidiary's Capital Stock to any Person other than the
Primary Borrower or any Wholly Owned Subsidiary, except:

               (a)  the sale or other disposition of inventory, or of surplus,
          obsolete or worn- out property or assets, whether now owned or
          hereafter acquired, in the ordinary course of business;

               (b)  the sale or other disposition of any other property or
          assets in the ordinary course of business (it being understood that
          this shall not include the sale or other disposition of all or
          substantially all of any business unit);

               (c)  the sale or other disposition of any property or assets
          (other than assets described in clauses (a) and (b) above), provided
                                                                      --------
          that the aggregate market

                                       22

<PAGE>

          value of all assets so sold or disposed of in any period of twelve
          consecutive months shall not exceed $20,000,000;

               (d)  the sale or discount without recourse of accounts receivable
          or notes receivable arising in the ordinary course of business, or the
          conversion or exchange of accounts receivable into or for notes
          receivable in connection with the compromise or collection thereof,
          provided that, in the case of any Foreign Subsidiary of the Primary
          --------
          Borrower, any such sale or discount may be with recourse if such sale
          or discount is consistent with customary practice in such Foreign
          Subsidiary's country of business;

               (e)  the sale or other disposition of any assets or property by
          the Primary Borrower or any of its Subsidiaries to the Primary
          Borrower or any Wholly Owned Subsidiary of the Primary Borrower;
          provided that (i) in the case of any such fixed capital asset that is
          --------
          subject to any Lien created and existing under the Security Documents
          and the fair value of which exceeds $5,000,000, such Lien may not be
          released upon such disposition unless such disposition is for fair
          value as evidenced by a certificate of a Responsible Officer of the
          Primary Borrower and (ii) in the case of any such a disposition by the
          Primary Borrower or any Domestic Subsidiary to any Foreign Subsidiary,
          such disposition is in the ordinary course of business;

               (f)  [intentionally omitted];

               (g)  as permitted by subsection 14.4(b) or (c);

               (h)  pursuant to Sale and Leaseback Transactions permitted by
          subsection 14.10;

               (i)  the abandonment, sale or other disposition of patents,
          trademarks or other intellectual property that are, in the reasonable
          judgment of the Primary Borrower, no longer economically practicable
          to maintain or useful in the conduct of the business of the Primary
          Borrower and its Subsidiaries taken as a whole;

               (j)  any sale or other disposition of the property of the Primary
          Borrower or any of its Subsidiaries set forth on Schedule 14.5(j);

               (k)  any sale or other disposition of the property of the Primary
          Borrower or any of its Subsidiaries, so long as the Net Proceeds of
          any such sale or other disposition do not exceed $50,000,000 in the
          aggregate after the Closing Date, provided that an amount equal to
                                            --------
          100% of the Net Proceeds of such sale or other disposition less the
                                                                     ----
          Reinvested Amount is applied in accordance with subsection 9.5(d); and

               (l)  any issuance, sale or other disposition of preferred stock
          (or equivalent equity interest) of any Subsidiary constituting
          Indebtedness created, incurred, assumed or existing in compliance with
          subsection 14.1.

                                       23

<PAGE>

          Section 14.6 Limitation on Restricted Payments. Declare or pay any
                       ---------------------------------
dividend (other than dividends payable solely in common stock of the Primary
Borrower or options, warrants or other rights to purchase common stock of the
Primary Borrower) on, or make any payment on account of, or set apart assets for
a sinking or other analogous fund for, the purchase, redemption, defeasance,
retirement or other acquisition of, any shares of any class of Capital Stock of
the Primary Borrower that is not Indebtedness or any warrants or options to
purchase any such stock, whether now or hereafter outstanding, or make any other
distribution (other than dividends payable solely in the common stock of the
Primary Borrower or options, warrants or other rights to purchase common stock
of the Primary Borrower) in respect thereof, either directly or indirectly,
whether in cash or property or in obligations of the Primary Borrower or any
Subsidiary (such declarations, payments, setting apart, purchases, redemptions,
defeasances, retirements, acquisitions and distributions being herein called
"Restricted Payments"), except that:
 -------------------

               (a)  the Primary Borrower may pay cash dividends in an amount
          sufficient to allow the Guarantor to pay its obligations to CD&R under
          any agreement with CD&R for the rendering of management consulting or
          financial advisory services, provided that such amount shall not
                                       --------
          exceed in the aggregate $750,000 per year plus reasonable
          out-of-pocket expenses;

               (b)  the Primary Borrower may pay cash dividends in an amount
          sufficient to allow the Guarantor to pay expenses incurred in the
          ordinary course of business in an aggregate amount not to exceed
          $1,000,000 in any fiscal year;

               (c)  the Primary Borrower may pay cash dividends in an amount
          sufficient to cover reasonable and necessary expenses (including
          professional fees and expenses) incurred by the Guarantor in
          connection with (i) registration, public offerings and exchange
          listing of equity or debt securities and maintenance of the same, (ii)
          compliance with reporting obligations under federal or state laws or
          under this Agreement or any of the other Credit Documents or the
          Convertible Note Documents and (iii) indemnification and reimbursement
          of directors, officers and employees in respect of liabilities
          relating to their serving in any such capacity;

               (d)  the Primary Borrower may pay cash dividends in amounts
          sufficient to pay tax liabilities of the Guarantor which are paid in
          cash by the Guarantor to any taxing authority;

               (e)  the Primary Borrower may, and may pay cash dividends in an
          amount sufficient to allow the Guarantor to, repurchase shares of its
          common stock or rights, options or units in respect thereof, from
          Management Investors, including as contemplated by the Management
          Subscription Agreements which may be entered into between the
          Guarantor or the Primary Borrower and Management Investors, for an
          aggregate purchase price not to exceed $2,500,000 in any fiscal year;
          provided that such amount shall be increased by an amount equal to the
          --------
          proceeds of any resales or new issuances of shares and options to any
          such Management Investors, at any time after the initial issuances to
          any

                                       24

<PAGE>

          Management Investors, together with the aggregate amount of deferred
          compensation owed by the Guarantor, the Primary Borrower or any of
          their Subsidiaries to any such Management Investor that shall
          thereafter have been canceled, waived or exchanged in connection with
          the grant to such Management Investor of the right to receive or
          acquire shares of the Guarantor's or the Primary Borrower's common
          stock; and

               (f)  the Primary Borrower may enter into and consummate the
          Transaction and the transactions expressly contemplated by the
          Transaction Documents, and may pay cash dividends in an amount
          sufficient to allow the Guarantor (i) to pay all fees and expenses
          incurred in connection with the Transaction and the transactions
          expressly contemplated by the Transaction Documents, (ii) to allow the
          Guarantor to perform its obligations under or in connection with the
          Transaction Documents, the Existing Transaction Documents or the
          Convertible Note Documents and (iii) permit the Guarantor to pay its
          Guarantee Obligations on account of the Senior Subordinated Notes and
          the Senior Subordinated Note Indenture, to the extent that the payment
          of such Guarantee Obligations does not violate the subordination
          provisions contained in the Senior Subordinated Notes or the Senior
          Subordinated Note Indenture.

          Section 14.7 Limitation on Capital Expenditures. Make or commit to
                       ----------------------------------
make (by way of the acquisition of securities of a Person or otherwise) any
expenditure (a "Capital Expenditure") in respect of the purchase or other
                -------------------
acquisition of fixed or capital assets (excluding (i) any such asset acquired in
connection with normal replacement and maintenance programs properly charged to
current operations and (ii) any Permitted Acquisition permitted by subsection
14.8(e)) except for (x) Capital Expenditures described in the immediately
preceding parenthetical and (y) additional Capital Expenditures, in the case of
this clause (y) not exceeding, in the aggregate for the Primary Borrower and its
Subsidiaries, during any fiscal year of the Primary Borrower the amount set
forth below opposite such fiscal year:

<TABLE>
<CAPTION>
              Fiscal Year                                Amount
              -----------                                ------
              <S>                                        <C>
              2001                                       $ 58,900,000
              2002                                       $ 45,000,000
              2003                                       $ 45,000,000
              2004                                       $ 70,900,000
              2005                                       $ 80,600,000
              2006                                       $ 91,500,000
              2007 and thereafter                        $103,800,000
</TABLE>

; provided, however, that (w) the amount set forth above for fiscal year 2002
  --------  -------
shall not be increased by virtue of any carry-over, (x) the amount set forth
above for fiscal year 2003 shall be increased by 100% of the amount set forth
above for fiscal year 2002 not expended during fiscal year 2002, (y) except as
provided in the foregoing clauses (w) and (x) of this proviso, any portion of
any amount set forth above which is not expended in the fiscal year for which it
is permitted above may be carried-over to increase the amount permitted for the
next fiscal year of the Primary Borrower and shall be deemed to be the first
amounts expended in such next fiscal

                                       25

<PAGE>

year, and (z) except as permitted by the foregoing clause (x) of this proviso,
none of the amounts set forth above shall be increased by more than 50% of such
amount by virtue of any carry-over.

          Section 14.8 Limitation on Investments, Loans and Advances. Make any
                       ---------------------------------------------
advance, loan, extension of credit or capital contribution to, or purchase any
stock, bonds, notes, debentures or other securities of or any assets
constituting a business unit of, or make any other investment (each an
"Investment") in, any Person, except:
 ----------

                  (a)  extensions of trade credit in the ordinary course of
          business;

                  (b)  Investments in cash and Cash Equivalents;

                  (c)  loans and advances to officers, directors or employees of
          the Guarantor, the Primary Borrower or their Subsidiaries (i) for
          travel, entertainment and relocation expenses in the ordinary course
          of business, (ii) for other purposes in an aggregate amount for the
          Guarantor, the Primary Borrower and their Subsidiaries, together with
          the aggregate amount of all Guarantee Obligations permitted pursuant
          to subsection 14.3(j)(iii), not to exceed $2,000,000 at any one time
          outstanding, (iii) relating to indemnification or reimbursement of any
          officers, directors or employees in respect of liabilities relating to
          their serving in any such capacity or as otherwise specified in
          subsection 14.9 and (iv) existing on the Closing Date and described in
          Schedule 14.8(f);

                  (d)  Investments by the Primary Borrower in, and loans,
          advances and capital contributions by the Primary Borrower to, any
          Wholly Owned Subsidiary and investments by Subsidiaries in, and loans,
          advances and capital contributions by Subsidiaries to, the Primary
          Borrower and Wholly Owned Subsidiaries;

                  (e)  the acquisition of all or substantially all of the
          business or assets or the Capital Stock of any Person or any business
          unit thereof or all or substantially all of the Capital Stock of any
          Person (a "Permitted Acquisition"), provided that:
                     ---------------------    --------

                  (i)  upon giving effect to such Permitted Acquisition on a pro
                       forma basis, either (A) the Primary Borrower would be in
                       Historical Pro Forma Compliance with respect to such
                       Permitted Acquisition, or (B) the Primary Borrower would
                       not be in Historical Pro Forma Compliance but would
                       otherwise be in compliance on a pro forma basis with each
                       of the financial covenants contained in Section 13 as if
                       such Permitted Acquisition had been made on the first day
                       of the Historical Period, and the aggregate cash purchase
                       price paid by the Primary Borrower and its Subsidiaries
                       for all Permitted Acquisitions made pursuant to this
                       subclause (B) after the Amendment Effective Date does not
                       exceed $10,000,000, or (C) the Primary Borrower would be
                       in compliance on a pro forma basis with each of the
                       financial covenants contained in Section 13 as if such
                       Permitted Acquisition had been made on the first day of
                       the Historical Period, and such Permitted Acquisition is
                       financed

                                       26

<PAGE>

                          entirely through the issuance of equity (excluding any
                          financing through the assumption of Indebtedness not
                          for borrowed money in connection with the
                          Acquisition);

                  (ii)    no Default or Event of Default has occurred and is
                          continuing at the time of consummation of such
                          Permitted Acquisition or will result therefrom; and

                  (iii)   any such acquisition of Capital Stock of any Person
                          may exclude any Capital Stock of such Person to the
                          extent necessary in the good faith judgment of the
                          Primary Borrower, to permit such acquisition to be
                          accounted for as a recapitalization;

                  (f)     Investments existing on the Closing Date and described
              in Schedule 14.8(f), setting forth the respective amounts of such
              Investments as of a recent date;

                  (g)     Investments in notes receivable and other instruments
              and securities obtained in connection with transactions permitted
              by subsection 14.5(d);

                  (h)     Investments in the nature of pledges or deposits with
              respect to leases or utilities provided to third parties in the
              ordinary course of business or otherwise described in subsection
              14.2(c), (d) or (j);

                  (i)     Investments representing non-cash consideration
              received by the Primary Borrower or any of its Subsidiaries in
              connection with any sale or other disposition of the property of
              the Primary Borrower or any of its Subsidiaries, provided that in
                                                               --------
              the case of any sale or other disposition permitted under
              subsection 14.5(j), such non-cash consideration constitutes not
              more than 25% of the aggregate consideration received in
              connection with such sale or other disposition and any such
              non-cash consideration received by the Primary Borrower or any of
              its Domestic Subsidiaries is pledged to the Administrative Agent
              for the benefit of the Lenders pursuant to the Security Documents;

                  (j)     Investments by the Primary Borrower or any of its
              Subsidiaries in one or more Persons in connection with joint
              ventures or similar arrangements in respect of which no other
              co-investor or other Person has a greater legal or beneficial
              ownership interest than the Primary Borrower or such Subsidiary in
              an aggregate amount not to exceed $5,000,000 at any one time
              outstanding;

                  (k)     Investments representing evidences of Indebtedness,
              securities or other property received from another Person by the
              Primary Borrower or any of its Subsidiaries in connection with any
              bankruptcy proceeding or other reorganization of such other Person
              or as a result of foreclosure, perfection or enforcement of any
              Lien or exchange for evidences of Indebtedness, securities or
              other property of such other Person held by the Primary Borrower
              or any of its Subsidiaries; provided that any such securities or
                                          --------
              other property received by the

                                       27

<PAGE>

                  Primary Borrower or any of its Domestic Subsidiaries is
                  pledged to the Administrative Agent for the benefit of the
                  Lenders pursuant to the Security Documents;

                      (l)  loans and advances to Management Investors in
                  connection with the purchase by such Management Investors of
                  Capital Stock of the Guarantor or the Primary Borrower of up
                  to $5,000,000 outstanding at any one time; provided that such
                                                             --------
                  amount shall be reduced by the aggregate principal amount of
                  Indebtedness in respect of Guarantee Obligations permitted by
                  subsection 14.3(e);

                      (m)  Investments in the Capital Stock of the Guarantor
                  which is held by the Guarantor as treasury stock and is
                  restored to unissued status or is eliminated from authorized
                  shares, or options in respect thereof;

                      (n)  Investments constituting Capital Expenditures, to the
                  extent permitted by subsection 14.7;

                      (o)  Investments of the Primary Borrower and its
                  Subsidiaries under any Hedging Arrangements; and

                      (p)  Investments not otherwise permitted by the preceding
                  clauses of subsection 14.8 in an aggregate amount not to
                  exceed $30,000,000 at any one time outstanding.

                  Section 14.9 Limitation on Transactions with Affiliates. Enter
                               ------------------------------------------
into any transaction, including, without limitation, any purchase, sale, lease
or exchange of property or the rendering of any service, with any Affiliate of
the Primary Borrower unless such transaction (a) is otherwise permitted under
this Agreement and (b) either (i) is upon terms no less favorable to the Primary
Borrower or such Subsidiary, as the case may be, than it would obtain in a
comparable arm's length transaction with a Person which is not such an Affiliate
or (ii) has been approved by a majority of the Disinterested Directors of the
Guarantor, or in the event that at the time of any such transaction, there are
no Disinterested Directors serving on the board of directors or comparable body
of the Guarantor, such transaction shall be approved by a nationally recognized
expert with expertise in appraising the terms and conditions of the type of
transaction for which approval is required; provided that nothing contained in
                                            --------
this subsection 14.9 shall be deemed to prohibit:

                      (i)  the Primary Borrower or any of its Subsidiaries from
                           entering into or performing any consulting,
                           management or employment agreements or other
                           compensation arrangements with a director, officer or
                           employee of the Primary Borrower or any of its
                           Subsidiaries that provides for annual aggregate base
                           compensation not in excess of $1,000,000 for each
                           such director, officer or employee;

                      (ii) the payment of transaction expenses in connection
                           with this Agreement, the Transaction and the German
                           Borrower Merger;

                                       28

<PAGE>

               (iii)  the Primary Borrower or any of its Subsidiaries from
                      entering into, making payments pursuant to and otherwise
                      performing an indemnification and contribution agreement
                      in favor of any of the persons listed on Schedule 1.1(b)
                      and their Affiliates, any Management Investor, and each
                      person who is or becomes a director, officer, agent or
                      employee of the Guarantor or any of its Subsidiaries, in
                      respect of liabilities (A) arising under the Securities
                      Act, the Exchange Act and any other applicable securities
                      laws or otherwise, in connection with any offering of
                      securities by the Guarantor or any of its Subsidiaries,
                      (B) incurred to third parties for any action or failure to
                      act of the Guarantor or any of its Subsidiaries,
                      predecessors or successors, (C) arising out of the
                      performance by CD&R of management consulting or financial
                      advisory services provided to the Guarantor or any of its
                      Subsidiaries, (D) arising out of the fact that any
                      indemnitee was or is a director, officer, agent or
                      employee of the Guarantor or any of its Subsidiaries, or
                      is or was serving at the request of any such corporation
                      as a director, officer, employee or agent of another
                      corporation, partnership, joint venture, trust or
                      enterprise or (E) to the fullest extent permitted by
                      Delaware or other applicable state law, arising out of any
                      breach or alleged breach by such indemnitee of his or her
                      fiduciary duty as a director or officer of the Guarantor
                      or any of its Subsidiaries;

               (iv)   the Guarantor or any of its Subsidiaries from performing
                      any agreements or commitments with or to any Affiliate
                      existing on the Closing Date and described on Schedule
                      14.9(iv);

               (v)    payments pursuant to the Tax Allocation Agreement; or

               (vi)   any transaction permitted under subsection 14.2(m),
                      14.3(e), 14.3(g), 14.3(j), 14.4, 14.6, 14.8(c) or 14.8(l),
                      or any transaction with the Primary Borrower or a Wholly
                      Owned Subsidiary of the Primary Borrower.

For purposes of this subsection 14.9, "Disinterested Director" shall mean, with
                                       ----------------------
respect to any Person and transaction, a member of the board of directors or
comparable body of such Person who does not have any material direct or indirect
financial interest in or with respect to such transaction (other than by virtue
of such member's ownership of Capital Stock of the Guarantor).

          Section 14.10 Limitation on Sales and Leasebacks. Enter into any
                        ----------------------------------
arrangement with any Person providing for the leasing by the Primary Borrower or
any Subsidiary of real or personal property which has been or is to be sold or
transferred by the Primary Borrower or such Subsidiary to such Person or to any
other Person to whom funds have been or are to be advanced by such Person on the
security of such property or rental obligations of the Primary Borrower or such
Subsidiary (any of such arrangements, a "Sale and Leaseback Transaction") other
                                         ------------------------------
than in connection with any sale or other disposition permitted under subsection
14.5 and except for Sale

                                       29

<PAGE>

and Leaseback Transactions entered into by the Primary Borrower or any such
Subsidiary with respect to real or personal property with an aggregate book
value not to exceed $20,000,000 at any one time.

     Section 14.11 Limitation on Changes in Fiscal Year. Permit the fiscal year
                   ------------------------------------
of the Primary Borrower to end on a day other than March 31.

     Section 14.12 Limitation on Optional Payments and Modifications of Debt
                   ---------------------------------------------------------
Instruments and other Material Agreements. (a) Make any optional payment,
-----------------------------------------
prepayment, repurchase or redemption of the Senior Subordinated Notes or make
any optional payments on account of or for a sinking or other analogous fund for
the repurchase, redemption, defeasance or other acquisition thereof (other than
mandatory payments of principal and interest and payments of, in each case, fees
and expenses required by the Senior Subordinated Notes or the Senior
Subordinated Note Indenture, only to the extent permitted under the
subordination provisions, if any, applicable thereto), (b) make any amendment,
supplement, modification or waiver of any of the terms of the Senior
Subordinated Notes or the Senior Subordinated Note Indenture (i) which amends or
modifies the subordination provisions contained in the Senior Subordinated Notes
and the Senior Subordinated Note Indenture; (ii) which shortens the fixed
maturity or increases the principal amount of, or increases the rate or shortens
the time of payment of interest on, or increases the amount or shortens the time
of payment of any principal or premium payable whether at maturity, at a date
fixed for prepayment or by acceleration or otherwise of the Indebtedness
evidenced by the Senior Subordinated Notes or increases the amount of, or
accelerates the time of payment of, any fees or other amounts payable in
connection therewith to any holder of the Senior Subordinated Notes; (iii) which
relates to any material affirmative or negative covenants or any events of
default or remedies thereunder and the effect of which is to subject the Primary
Borrower, or any of its Subsidiaries, to any more onerous or more restrictive
provisions; or (iv) which otherwise adversely affects the interests of the
Lenders as senior creditors with respect to the Senior Subordinated Notes or the
interests of the Lenders hereunder in any material respect, (c) in the event of
the occurrence of a Change of Control, repurchase the Senior Subordinated Notes,
unless the Primary Borrower shall have (i) made, or caused to have been made,
payment in full of the Loans, all Reimbursement Obligations and any other
amounts then due and owing to any Lender or the Administrative Agent hereunder
and under any Note and cash collateralized the Domestic L/C Obligations on terms
reasonably satisfactory to the Administrative Agent or (ii) made, or caused to
have been made, an offer to pay the Loans, all Reimbursement Obligations and any
amounts then due and owing to each Lender and the Administrative Agent hereunder
and under any Note and to cash collateralize the Domestic L/C Obligations in
respect of each Lender and shall have made, or caused to have been made, payment
in full thereof to each such Lender or the Administrative Agent which has
accepted such offer and cash collateralized the Domestic L/C Obligations in
respect of each such Lender which has accepted such offer, (d) make any optional
payment, prepayment, repurchase or redemption of the Convertible Notes or the
Additional Indebtedness or any cash payment of interest in respect of the
Convertible Notes or any Additional Indebtedness or make any optional payments
on account of or for a sinking or other analogous fund for the repurchase,
redemption, defeasance or other acquisition of Convertible Notes or any
Additional Indebtedness (except to the extent any payment is made in equity of
the Guarantor or rights to acquire any such equity), (e) make any amendment,
supplement, modification or waiver of any of the terms of the Convertible Notes,
the Convertible Note Documents or any Additional Indebtedness (i) which

                                       30

<PAGE>

(except to the extent any payment is made in equity of the Guarantor or rights
to acquire any such equity) shortens the fixed maturity of or increases the
aggregate principal amount thereof to an amount in excess of $125,000,000 plus
the amount of any interest accreted or paid in kind in respect thereof, or
increases the rate or shortens the time of payment of interest on, or increases
the amount or shortens the time of payment of any principal or premium payable
whether at maturity, at a date fixed for prepayment or by acceleration or
otherwise thereof or increases the amount of, or accelerates the time of payment
of, any fees or other amounts payable in connection therewith to any holder
thereof; (ii) which relates to any material affirmative or negative covenants or
any events of default or remedies thereunder and the effect of which is to
subject the Primary Borrower, or any of its Subsidiaries, to any more onerous or
more restrictive provisions; or (iii) which otherwise adversely affects the
interests of the Lenders under the Intercreditor Agreement or the interests of
the Lenders hereunder in any material respect; provided that the foregoing will
not prohibit or restrict any amendment, supplement, modification or waiver to
provide the Convertible Notes or Additional Indebtedness with the benefit of any
Lien on Collateral permitted by subsection 14.2(s), or any Guarantee Obligation
permitted by subsection 14.3(q), or (f) in the event of the occurrence of a
Change of Control, repurchase the Convertible Notes, unless the Primary Borrower
shall have (i) made, or caused to have been made, payment in full of the Loans,
all Reimbursement Obligations and any other amounts then due and owing to any
Lender or the Administrative Agent hereunder and under any Note and cash
collateralized the Domestic L/C Obligations on terms reasonably satisfactory to
the Administrative Agent or (ii) made, or caused to have been made, an offer to
pay the Loans, all Reimbursement Obligations and any amounts then due and owing
to each Lender and the Administrative Agent hereunder and under any Note and to
cash collateralize the Domestic L/C Obligations in respect of each Lender and
shall have made, or caused to have been made, payment in full thereof to each
such Lender or the Administrative Agent which has accepted such offer and cash
collateralized the Domestic L/C Obligations in respect of each such Lender which
has accepted such offer.

     Section 14.13 Limitation on Negative Pledge Clauses. Enter into any
                   -------------------------------------
agreement which prohibits or limits the ability of the Primary Borrower or any
of its Subsidiaries to create, incur, assume or suffer to exist any Lien upon
any of its property or revenues, whether now owned or hereafter acquired, to
secure the obligations hereunder or, in the case of any guarantor, its
obligations under the Collateral Agreement, other than (a) this Agreement and
the other Credit Documents and any related documents and (b) any industrial
revenue or development bonds, agreements governing any purchase money Liens,
acquisition agreements or Financing Leases or operating leases of real property
entered into in the ordinary course of business otherwise permitted hereby (in
which case, any prohibition or limitation shall only be effective against the
assets financed, acquired or leased thereby).

     Section 14.14 Limitation on Lines of Business. Enter into any business,
                   -------------------------------
either directly or through any Subsidiary, except for those businesses of the
same general type as those in which the Primary Borrower and its Subsidiaries
are engaged on the Closing Date or which are related thereto.

     Section 14.15 Limitation on Inactive Subsidiaries. At any time after the
                   -----------------------------------
date that is 45 days after the Amendment Effective Date, (a) in the case of any
Inactive Subsidiary (i) conduct, transact or otherwise engage in, or commit to
conduct, transact or otherwise engage in,

                                       31

<PAGE>

any business or operations outside the ordinary course of business, (ii) incur,
create, assume or suffer to exist any material Indebtedness (other than
Indebtedness existing on the Amendment Effective Date), (iii) incur, create or
assume any other material liability or material financial obligation (other than
any such liability or financial obligation existing on the Amendment Effective
Date) or (iv) own, lease, manage or otherwise operate any material properties or
assets (other than property or assets owned or leased on the Amendment Effective
Date), (b) make any Investment in any such Inactive Subsidiary other than in
connection with any activity permitted by the preceding clause (a) (including
without limitation to pay or perform any Indebtedness, liability or obligation
permitted thereby), (c) dispose of any material assets or property to any such
Inactive Subsidiary, unless, in the case of clauses (a), (b) and (c), within 30
days of taking any such actions, the Primary Borrower or its Subsidiary, as the
direct parent of such Inactive Subsidiary, as the case may be, and such Inactive
Subsidiary execute and deliver a supplement to the Assumption Agreement relating
to such Inactive Subsidiary making the representations and agreeing to the
covenants it would have previously made and agreed to with respect to such
Inactive Subsidiary pursuant to this Agreement and the Collateral Agreement but
for the provisions of subsection 12.9(d)(ii). It is understood and agreed that
any Inactive Subsidiary that takes any action described in clauses (a), (b) and
(c) of the foregoing sentence shall cease to be an Inactive Subsidiary and be
deemed to be an Active Subsidiary for all purposes of this Agreement and the
other Credit Documents on the date that is 30 days after the taking of such
action.

     Section 14.16 Limitation on Cash. (a) Permit, at any time after 45 days
                   ------------------
following the Amendment Effective Date, the aggregate amount of cash and Cash
Equivalents owned by the Primary Borrower or any of its Domestic Subsidiaries
that is not held in Qualified Accounts (as defined below) to exceed $10,000,000
or (b) permit, at any time after 60 days following the Amendment Effective Date,
the aggregate amount of cash and Cash Equivalents owned by Foreign Subsidiaries
held by Persons that are not Lenders or Affiliates thereof to exceed
$15,000,000; provided, however, if, as a result of an assignment of any Lender's
             --------  -------
obligations under this Agreement pursuant to subsection 17.6, or of any Person
holding cash or Cash Equivalents of the Primary Borrower or any of its
Subsidiaries otherwise no longer being a Lender or an Affiliate of a Lender, the
Primary Borrower and its Subsidiaries are no longer in compliance with the
foregoing clause (b), the Primary Borrower and its Subsidiaries shall have 60
days from the date of the Primary Borrower's receipt of notice of such
assignment, or of such Person no longer being a Lender or an Affiliate of a
Lender, to come into compliance with such clause (b). For the purposes of this
subsection 14.16, the term "Qualified Accounts" shall mean any deposit account
                            ------------------
of the Primary Borrower or any Domestic Subsidiary in which the Administrative
Agent has a perfected first priority security interest (subject to customary
qualifications), on terms and conditions reasonably satisfactory to the
Administrative Agent.

                                       32

<PAGE>

                                                                       EXHIBIT L
                                                         to the Credit Agreement

                         Form of Intercreditor Agreement
                         -------------------------------

                               [Separate Document]

                                       33

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