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DuctIn telecommunication, the term duct has the following meanings:1. In interfacility cabling, a conduit, which may be direct-earth buried or encased in concrete, used to enclose communications or power cables. Note: For maximum resistance to rodent attack, direct-earth-buried conduit should have an outside diameter equal to or greater than 6 cm (2.25 in.). 2. See atmospheric duct. Source: from Federal Standard 1037C 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Duct".