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        <link:definition>2128100 - Disclosure - Acquisitions</link:definition>
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        <link:definition>2140100 - Disclosure - Earnings Per Share</link:definition>
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        <link:definition>2131100 - Disclosure - Income Taxes</link:definition>
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        <link:definition>2119100 - Disclosure - Indebtedness</link:definition>
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        <link:definition>2113100 - Disclosure - Intangible Assets</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="Inventories" roleURI="http://www.blackbox.com/role/Inventories">
        <link:definition>2107100 - Disclosure - Inventories</link:definition>
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        <link:definition>2144100 - Disclosure - Segment Reporting</link:definition>
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        <link:definition>2104100 - Disclosure - Significant Accounting Policies / Recent Accounting Pronouncements</link:definition>
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        <link:definition>2134100 - Disclosure - Stock-based Compensation</link:definition>
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