The NID is the location where your internal wire links to our external wiring. Customers might refer to it as the network box or phone box, while technicians typically just refer to it as "the NID."
Typically, these boxes measure 6 by 9 inches and are gray (or painted to match the house). It will frequently be fastened to the house's exterior next to the electric meter. It can occasionally be located in the attic or basement. On the outside, it's typically branded "Network Interface Device" or "Telephone Network Interface."