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[[file:apl germany.jpeg|thumb|upright|A German copper phone line termination box called ''[[:de:Abschlusspunkt Linientechnik|Abschlusspunkt LinienTechnik]]'' (APL, "[[Demarcation point]]")]]
In [[telecommunications]], a '''network interface device''' ('''NID'''; also known by several other names) is a device that serves as the [[demarcation point]] between the carrier's [[local loop]] and the customer's [[on-premises wiring|premises wiring]]. 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.
== Naming ==
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{{Main|Intelligent Network Interface Device}}
[[file:Network Interface Unit.jpg|thumb|upright|Three smartjacks for [[Digital Signal 1|T-1]] circuits, in two shelves; a [[66 block]] is on the left]]
Several types of NIDs provide more than just a terminal for the connection of wiring. Such NIDs are colloquially called ''smartjacks'' or [[Intelligent Network Interface Device]]s (INIDs) as an indication of their built-in "intelligence", as opposed to a simple NID, which is just a wiring device. Smartjacks are typically used for more complicated types of [[telecommunications service]], such as [[Digital Signal 1|T1 lines]]. [[Plain old telephone service]] lines generally cannot be equipped with smartjacks.
Despite the name, most smartjacks are much more than a simple [[Telephone jack and plug|telephone jack]]. One common form for a smartjack is a [[printed circuit board]] with a face plate on one edge, mounted in an enclosure.
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