what is an nid
What is NID: Network Interface Device? NID: Network Interface Device. A device that terminates copper pair from the serving central office at the user's destination and which is typically located outside that location. In a FIOS installation with phone service, the installer will run a cable from the ONT to the NID in order to connect the POTS termination on the ONT to the existing inside wiring.
Network interface device. Not to be confused with Network interface controller. 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 premises wiring.