In telecommunications, a Network Interface Device (NID) is a device that serves as the demarcation point between the carrier's local loop and the customer's premises wiring.
Generically, an NID may also be called a Network Interface Unit (NIU), Telephone Network Interface (TNI), System Network Interface (SNI), or telephone network box. A smartjack is a type of NID with capabilities beyond simple electrical connection, such as diagnostics. An Optical Network Terminal (ONT) is a type of NID used with fiber-to-the-premises applications.
Read more about Network Interface Device: Wiring Termination, Smartjack, Optical Network Terminals, Sources
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