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Exhibit 10.cc

SECOND AMENDMENT TO
PARTICIPATION AGREEMENT

        THIS SECOND AMENDMENT TO PARTICIPATION AGREEMENT, dated as of August 24,
2001 (this " Amendment "), amends the Participation Agreement, dated as of
October 22, 1999, by and among ADC Telecommunications, Inc., a Minnesota
corporation, as Lessee; Lease Plan North America, Inc., not in its individual
capacity, except as expressly stated therein, but solely as Agent Lessor for the
Participants; the Persons named on Schedule I thereto, as Participants; and ABN
AMRO Bank N.V., as Administrative Agent, as amended by the First Amendment to
Participation Agreement, dated as of January 29, 2001 (the " First Amendment ")
(as so amended by the First Amendment, the " Participation Agreement ").
Capitalized terms used herein and not otherwise defined herein shall have the
respective meanings assigned thereto in Appendix 1 to the Participation
Agreement.

        WHEREAS, the parties hereto have entered into the Participation
Agreement and the other Operative Documents to fund the Construction of the
Financed Improvements on the Land; and

        WHEREAS, the parties hereto desire to amend the Participation Agreement
as hereinafter set forth;

        NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration (the receipt and sufficiency of which are hereby
acknowledged), the parties hereto agree as follows:

        SECTION 1 AMENDMENTS. Effective as of the date hereof and subject to the
satisfaction of the conditions precedent set forth in Section 3 , the
Participation Agreement shall be amended in accordance with Sections 1.1-1.3 .

        SECTION 1.1 Net Worth . Section 8.17 of the Participation Agreement is
hereby amended and restated in its entirety to read as follows:

"SECTION 8.17 Net Worth . Lessee shall not permit at any time Net Worth to be
less than the sum of (a) $1,929,000,000, plus (b) 50% of positive net income for
the period from and including May 1, 2001, to and including October 31, 2001,
plus (c) for each fiscal year, commencing with the fiscal year ending
October 31, 2001, 50% of positive net income for such fiscal year, plus (d) with
respect to the issuance or sale of capital stock of Lessee or the conversion of
Indebtedness of Lessee into equity of Lessee, in each case occurring after the
date hereof, 50% of the aggregate Net Issuance Proceeds received by Lessee from
such issuance or sale of capital stock, plus 50% of the principal amount of any
Indebtedness so converted if such issuance, sale or conversion occurs at a time
when Lessee shall have no Rating or at a time when Lessee's Rating is lower than
BBB- and Baa3, respectively; such covenant to be calculated as of the end of
each fiscal quarter."

        SECTION 1.2 Funded Debt to EBITDA Ratio . Section 8.18 of the
Participation Agreement is hereby amended and restated in its entirety to read
as follows:

"SECTION 8.18 Funded Debt to EBITDA Ratio . Lessee shall not permit, as of the
end of any fiscal quarter, the ratio of (a) aggregate principal amount of Funded
Debt of Lessee and its Subsidiaries to (b) EBITDA for the four consecutive
fiscal quarters then ending, to exceed 2.75:1."

        SECTION 1.3 Definitions . (a) Each of the following definitions
appearing in Appendix 1 to the Participation Agreement is hereby amended and
restated in its entirety to read as follows:

        "' Applicable Commitment Fee Rate ' means, at any time, the rate per
annum of 37.5 basis points."

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        "' Applicable Tranche A2 Margin ' means, at any time of determination of
the LIBO Rate or the Alternate Base Rate for purposes of the Tranche A2
Certificate Amounts, the rate per annum of 225 basis points."

        "' Applicable Tranche A3 Margin ' means, at any time of determination of
the LIBO Rate or the Alternate Base Rate for purposes of the Tranche A3
Certificate Amounts, the rate per annum of 235 basis points."

        "' Applicable Tranche B Margin ' means, at any time of determination of
the LIBO Rate or the Alternate Base Rate, the rate per annum of 250 basis
points."

        "' Applicable Tranche C Equity Margin ' means, at any time of
determination of the LIBO Rate or the Alternate Base Rate, the rate per annum of
350 basis points."

        "' EBITDA ' means, for any applicable period, Net Income for such
period, plus, to the extent deducted in determining Net Income for such period,
the aggregate amount of (i) Interest Expense, (ii) federal, state, local and
foreign income taxes, (iii) depletion, depreciation and amortization of tangible
and intangible assets and (iv) for the quarter ended April 30, 2001,
$251,619,000 of non-recurring charges which accrued during such quarter."

        "' Interest Expense ' means, for any applicable period, the aggregate
consolidated interest expense (both cash and non-cash and determined without
regard to original issue discount) of Lessee and its Subsidiaries for such
period plus , without duplication, any interest expense which would have accrued
during such period if all Indebtedness which existed immediately after the
consummation of any merger to which Lessee is a party or of any Acquisition by
Lessee or its Subsidiaries, in each case, during such period was in existence on
the first day of such period, as determined in accordance with GAAP, including,
to the extent allocable to interest expense in accordance with GAAP, (i) all
other fees paid or owed with respect to the issuance or maintenance of
Contingent Obligations (including letters of credit of Lessee and its
Subsidiaries), (ii) net costs or benefits payable under Swap Contracts of Lessee
and its Subsidiaries, (iii) the portion of any payments made in respect of
obligations in respect of capitalized leases of Lessee and its Subsidiaries
allocable to interest expense and (iv) the portion of any rental payments made
in respect of synthetic leases under which Lessee or any Subsidiary is lessee
allocable to interest."

        "' Tranche A2 Put Margin ' means 250 basis points per annum."

        "' Tranche A3 Put Margin ' means 260 basis points per annum."

        "' Tranche B Basic Rent ' means, for each Payment Date with respect to
each Interest Period ending on such Payment Date, an amount equal to the product
of (a) the daily aggregate Certificate Amounts of the Tranche B Participants,
(b) the sum of the LIBO Rate (Reserve Adjusted) for such Interest Period (or
pursuant to Section 14.1 or 14.2 of the Participation Agreement, the Alternate
Base Rate) plus the Applicable Tranche B Margin, (c) 1/360 and (d) the number of
days in such Interest Period; provided , that if a Put Event has occurred, the
foregoing clause (b) shall be deemed to be the sum of the LIBO Rate (Reserve
Adjusted) for such Interest Period plus the Tranche B Put Margin as in effect
from time to time; and provided further , that immediately upon the occurrence
of an Event of Default, the foregoing clause (b) shall be deemed to be the sum
of the Alternate Base Rate in effect in such Interest Period plus 250 basis
points per annum."

        "' Tranche C Basic Rent ' means, for each Payment Date with respect to
each Interest Period ending on such Payment Date, an amount equal to the product
of (a) the daily aggregate Certificate Amounts of the Tranche C Equity
Participants, (b) the sum of the LIBO Rate (Reserve Adjusted) for such Interest
Period (or pursuant to Section 14.1 or 14.2 of the Participation Agreement, the
Alternate Base Rate) plus the Applicable Tranche C Equity Margin, (c) 1/360 and

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(d) the number of days in such Interest Period; provided , that if a Put Event
has occurred, the foregoing clause (b) shall be deemed to be the sum of the LIBO
Rate (Reserve Adjusted) for such Interest Period plus the Tranche C Put Margin
as in effect from time to time; and provided further , that immediately upon the
occurrence of an Event of Default, the foregoing clause (b) shall be deemed to
be the sum of the Alternate Base Rate in effect in such Interest Period plus 275
basis points per annum."

        (b)  Appendix I to the Participation Agreement is hereby amended by
adding thereto the following new terms in proper alphabetical order:

        "' Tranche B Put Margin ' means 275 basis points per annum."

        "' Tranche C Put Margin ' means 375 basis points per annum."

        SECTION 2 AMENDMENT FEE. Lessee agrees to pay to the Administrative
Agent on the date hereof for the pro-rata benefit of the Participants an
amendment fee (the "' Amendment Fee ") in an amount equal to 0.25% of the
Commitments.

        SECTION 3 CONDITIONS PRECEDENT. This Amendment shall become effective as
of the date hereof upon the satisfaction or waiver of each of the following
conditions precedent:

        (a)  The Agent Lessor shall have received this Amendment, duly executed
by each of the parties hereto.

        (b)  The Administrative Agent shall have received, on behalf of the
Participants, payment of the Amendment Fee.

        (c)  Each of the Participants and the Agent Lessor shall have received
copies (executed or certified, as may be appropriate) of all legal documents or
proceedings taken in connection with the execution and delivery of this
Amendment to the extent each of the Participants or the Agent Lessor or their
respective counsel may reasonably request.

        (d)  Legal matters incident to the execution and delivery of this
Amendment shall be satisfactory to each of the Participants and the Agent Lessor
and their respective counsel.

        SECTION 4 REPRESENTATIONS AND WARRANTIES. Each of the parties hereto
hereby represents and warrants that (a) the execution, delivery and performance
of this Amendment has been duly authorized by such party, (b) the person
executing this Amendment on its behalf has been duly authorized to act on its
behalf, (c) this Amendment constitutes its legal, valid, binding and enforceable
agreement, except as enforceability may be limited by bankruptcy, insolvency,
reorganization, moratorium or other laws or equitable principles relating to or
limiting the rights of creditors generally and (d) its entry into this Amendment
will not violate any agreement, law, rule or regulation by which it is bound or
by which any of its assets are affected. In order to induce the Participants and
the Agent Lessor to execute and deliver this Amendment, Lessee hereby represents
to each of the Participants and the Agent Lessor that, as of the date hereof,
the representations and warranties set forth in Section 7.2 of the Participation
Agreement are and shall be and remain true and correct and Lessee is in full
compliance with all of the terms and conditions of each Operative Document to
which it is a party and no Default or Event of Default has occurred and is
continuing or shall result after giving effect to this Amendment.

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        SECTION 5 MISCELLANEOUS.

        SECTION 5.1 Continuing Effectiveness, etc . This Amendment shall be
deemed to be an amendment to the Participation Agreement, and the Participation
Agreement, as amended hereby, and each other Operative Document, shall remain in
full force and effect and are hereby ratified, approved and confirmed in each
and every respect. On and after the date hereof, all references to the
"Participation Agreement" in the Operative Documents or in any other document,
instrument, certificate, agreement, opinion or writing shall be deemed to refer
to the Participation Agreement as amended hereby. Except as expressly set forth
herein, the execution, delivery and effectiveness of this Amendment shall not
operate as an amendment, modification or waiver of any provision, right, power
or remedy of any party hereto under any Operative Document.

        SECTION 5.2 Severability . Any provision of this Amendment which is
prohibited or unenforceable in any jurisdiction shall, as to such provision and
such jurisdiction, be ineffective to the extent of such prohibition or
unenforceability without invalidating the remaining provisions of this Amendment
or affecting the validity or enforceability of such provision in any other
jurisdiction.

        SECTION 5.3 Headings . The various headings of this Amendment are
inserted for convenience of reference only and shall not affect the meaning or
interpretation of this Amendment or any provisions hereof.

        SECTION 5.4 Execution in Counterparts . This Amendment may be executed
by the parties hereto in several counterparts, each of which shall be deemed to
be an original and all of which shall constitute together but one and the same
agreement.

        SECTION 5.5 Governing Law . THIS AMENDMENT SHALL IN ALL RESPECTS BE
GOVERNED BY THE INTERNAL LAW OF THE STATE OF NEW YORK AS TO ALL MATTERS OF
CONSTRUCTION, VALIDITY AND PERFORMANCE, WITHOUT REGARD TO CONFLICTS OF LAW
PRINCIPLES, EXCEPT TITLE 14 OF ARTICLE 5 OF THE NEW YORK GENERAL OBLIGATIONS
LAW. This Amendment constitutes the entire understanding among the parties
hereto with respect to the subject matter hereof and supersedes any prior
agreement, written or oral, with respect thereto.

        SECTION 5.6 Successors and Assigns . This Amendment shall be binding
upon and shall inure to the benefit of the parties hereto and their respective
successors and assigns.

        SECTION 5.7 Fees and Expenses . Lessee agrees to pay on demand all costs
and expenses of or incurred by each of the other parties hereto in connection
with the negotiation, preparation, execution and delivery of this Amendment,
including the fees and expenses of counsel for the Agent Lessor.

        [signature pages follow]

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

    ADC TELECOMMUNICATIONS, INC., as Lessee
 
 
By:
 
/s/  GOKUL V. HEMMADY              

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    Name:   Gokul V. Hemmady        

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    Title:   Vice President and Treasurer        

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    LEASE PLAN NORTH AMERICA, INC., not in its individual capacity, except as
expressly stated in the Participation Agreement, but solely as Agent Lessor
 
 
By:
 
/s/  BLAKE J. LACHER              

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    Name:   Blake J. Lacher        

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    Title:   Vice President        

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    AMSTERDAM FUNDING CORPORATION, as a Participant
 
 
By:
 
/s/  ANDREW L. STIDD              

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    Name:   Andrew L. Stidd        

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    Title:   President        

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    ABN AMRO BANK N.V., as a Participant
 
 
By:
 
/s/  PETER L. EATON              

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    Name:   Peter L. Eaton        

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    Title:   Group Vice President        

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By:
 
/s/  JOHN P. RICHARDSON              

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    Name:   John P. Richardson        

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    Title:   Vice President        

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SECOND AMENDMENT TO PARTICIPATION AGREEMENT