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Reference.org
Network interface device
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<p>In <a href="/facts/Telecommunications/vxoj1cxR">telecommunications</a>, a network interface device (NID; also known by several other names) is a device that serves as the <a href="/facts/Demarcation_point/SY4SRnnh">demarcation point</a> between the carrier's <a href="/facts/Local_loop/rSRfLPaq">local loop</a> and the customer's <a href="/facts/On-premises_wiring/crkbNWdV">premises wiring</a>. Outdoor telephone NIDs also provide the subscriber with access to the station wiring and serve as a convenient test point for verification of loop integrity and of the subscriber's inside wiring. </p>