GUARANTY AND SURETYSHIP AGREEMENT

Exhibit 10.11

GUARANTY AND SURETYSHIP AGREEMENT

     THIS GUARANTY AND SURETYSHIP AGREEMENT (this “ Agreement ”) dated as of the 30 ^th day of January, 2008, made by BLACK BOX CORPORATION, a Delaware corporation (“ Guarantor ”), to the lenders parties to the Credit Agreement (as defined below) from time to time (the “ Lenders ”) and CITIZENS BANK OF PENNSYLVANIA, a banking association organized under the laws of the Commonwealth of Pennsylvania, as agent for the Lenders (in such capacity, together with its successors in such capacity, the “ Agent ”).

WITNESSETH :

     WHEREAS, Guarantor, Black Box Corporation of Pennsylvania, a Delaware corporation (“ BBCPA ”), Norstan, Inc., a Minnesota corporation (“ Norstan ”), certain of the Lenders, the Agent, and certain Subsidiaries of the Guarantor entered into that certain Second Amended and Restated Credit Agreement dated as of January 24, 2005 (as amended, the “ Existing Credit Agreement ”), pursuant to which the Lenders made a revolving credit facility available to BBCPA and Norstan;

     WHEREAS, in connection with the Existing Credit Agreement, the Guarantor executed and delivered to the Lenders and the Agent that certain Guaranty and Suretyship Agreement dated as of January 24, 2005 (the “ Existing Guaranty ”);

     WHEREAS, Guarantor, BBCPA, Norstan (Norstan, collectively with BBCPA, the “ Borrowers ”), the guarantor parties thereto, the Lenders and the Agent are parties to a Third Amended and Restated Credit Agreement, dated as of January 30, 2008 (as amended, the “ Credit Agreement ”), which amends and restates the Existing Credit Agreement; and

     WHEREAS, pursuant to the terms of the Credit Agreement, Lenders may make certain Loans to the Borrowers as evidenced in part by certain promissory notes of the Borrowers to each Lender dated of even date herewith (collectively, the “ Note ”);

     WHEREAS, the execution and delivery by Guarantor of this Agreement is a condition to Lenders’ obligation to make Loans to the Borrowers and to issue letters of credit on behalf of the Borrowers, and Guarantor, as owner, directly or indirectly, of all of the outstanding shares of stock of the Borrowers, expects to derive a financial benefit from the making of such Loans and issuances of such letters of credit; and

     WHEREAS, this Agreement amends and restates the Existing Guaranty.

     NOW, THEREFORE, in consideration of the premises and other good and valuable consideration, the receipt of which is hereby acknowledged by Guarantor, and intending to be legally bound, Guarantor hereby agrees as follows:

ARTICLE I.
DEFINITIONS

          1.1 Definitions .

               (a)  Certain Definitions . Capitalized terms not otherwise defined herein shall have the meanings given in the Credit Agreement. In addition to the other terms defined elsewhere in this Agreement, as used herein the following terms shall have the following meanings:

          “ Guaranteed Obligations ” shall mean all obligations from time to time of the Borrowers, collectively or individually, to the Agent or any Lender under or in connection with any Loan Document, including all obligations to pay principal, interest, fees, indemnities or other amounts under such Loan Documents, in each case whether such obligations are direct or indirect, secured or unsecured, joint or several, absolute or contingent, due or to become due, whether for payment or performance, now existing or hereafter arising (including interest and other obligations arising or accruing after the commencement of any bankruptcy, insolvency, reorganization, dissolution or similar proceeding with respect to the Borrowers or any other Person, or which would have arisen or accrued but for the commencement of such proceeding, even if such obligation or the claim therefor is not enforceable or allowable in such proceeding).

ARTICLE II.
GUARANTY AND SURETYSHIP

          2.1 Guaranty and Suretyship . The Guarantor hereby absolutely, unconditionally and irrevocably guarantees and becomes surety for the full and punctual payment and performance of the Guaranteed Obligations as and when such payment or performance shall become due (at scheduled maturity, by acceleration or otherwise) in accordance with the terms of the Loan Documents. This Agreement is an agreement of suretyship as well as of guaranty, is a guarantee of payment and performance and not merely of collectibility, and is in no way conditioned upon any attempt to collect from or proceed against the Borrowers or any other Person or any other event or circumstance. The obligations of the Guarantor under this Agreement are direct and primary obligations of the Guarantor and are independent of the Guaranteed Obligations, and a separate action or actions may be brought against the Guarantor regardless of whether action is brought against the Borrowers or any other Person or whether the Borrowers or any other Person is joined in any such action or actions.

          2.2 Obligations Absolute . The Guarantor agrees that the Guaranteed Obligations will be paid and performed strictly in accordance with the terms of the Loan Documents, regardless of any law, regulation or order now or hereafter in effect in any jurisdiction affecting the Guaranteed Obligations, any of the terms of the Loan Documents or the rights of the Agent or any Lender or any other Person with respect thereto. The obligations of the Guarantor under this Agreement shall be absolute, unconditional and irrevocable, irrespective of any of the following:

               (a) any lack of legality, validity, enforceability, allowability (in a bankruptcy, insolvency, reorganization, dissolution or similar proceeding, or otherwise), or any avoidance or subordination, in whole or in part, of any Loan Document or any of the Guaranteed Obligations;

               (b) any change in the amount, nature, time, place or manner of payment or performance of, or in any other term of, any of the Guaranteed Obligations (whether or not such change is contemplated by the Loan Documents as presently constituted, and specifically including any increase in the Guaranteed Obligations, whether resulting from the extension of additional credit to the Borrowers or otherwise), any execution of any additional Loan Documents, or any amendment or waiver of or any consent to departure from any Loan Document;

               (c) any taking, exchange, release, impairment or nonperfection of any collateral, or any taking, release, impairment or amendment or waiver of or consent to departure from any other guaranty or other direct or indirect security for any of the Guaranteed Obligations;

               (d) any manner of application of collateral or other direct or indirect security for any of the Guaranteed Obligations, or proceeds thereof, to any of the Guaranteed Obligations, or any commercially reasonable manner of sale or other disposition of any collateral for any of the Guaranteed Obligations or any other assets of the Borrowers;

               (e) any permanent impairment by any Lender or any other Person of any recourse of the Guarantor against the Borrowers or any other Person, or any other permanent impairment by any Lender or any other Person of the suretyship status of the Guarantor;

               (f) any bankruptcy, insolvency, reorganization, dissolution or similar proceedings with respect to, or any change, restructuring or termination of the corporate structure or existence of, the Borrowers, the Guarantor or any other Person; or

               (g) any failure of any Lender or any other Person to disclose to the Guarantor any information pertaining to the business, operations, condition (financial or other) or prospects of the Borrowers or any other Person, or to give any other notice, disclosure or demand.

          2.3 Waivers, etc . The Guarantor hereby irrevocably waives any defense to or limitation on its obligations under this Agreement arising out of or based upon any matter referred to in Section 2.2 and, without limiting the generality of the foregoing, any requirement of promptness, diligence or notice of acceptance, any other notice, disclosure or demand with respect to any of the Guaranteed Obligations and this Agreement, any requirement of acceptance hereof, reliance hereon or knowledge hereof by the Agent or any Lender, and any requirement that the Agent or any Lender protect, secure, perfect or insure any lien or any property subject thereto or exhaust any right or take any action against the Borrowers or any other Person or any collateral or other direct or indirect security for any of the Guaranteed Obligations. Notwithstanding the foregoing sentence, the Guarantor’s waiver under this Section 2.3 shall apply only to the Guarantor’s obligations hereunder and shall not limit or waive any of the

Guarantor’s rights or obligations as a borrower under the Credit Agreement or any other subrogation rights.

          2.4 Reinstatement . This Agreement shall continue to be effective, or be automatically reinstated, as the case may be, if at any time payment of any of the Guaranteed Obligations is avoided, rescinded or must otherwise be returned by the Agent or any Lender for any reason, all as though such payment had not been made.

          2.5 No Stay . Without limiting the generality of any other provision of this Agreement, if any acceleration of the time for payment or performance of any Guaranteed Obligation, or any condition to any such acceleration, shall at any time be stayed, enjoined or prevented for any reason (including stay or injunction resulting from the pendency against the Borrowers or any other Person of a bankruptcy, insolvency, reorganization, dissolution or similar proceeding), the Guarantor agrees that, for purposes of this Agreement and its obligations hereunder, at the option of the Agent such Guaranteed Obligation shall be deemed to have been accelerated and such condition to acceleration shall be deemed to have been met.

          2.6 Payments . All payments to be made by the Guarantor pursuant to this Agreement shall be made at the times and in the manner prescribed for payments in Articles II and III of the Credit Agreement, without setoff, counterclaim, withholding or other deduction of any nature. All payments made by the