Whether you have one telephone in your house or 10, you must connect each one to the network interface device, or NID, which is the box outside your house in which the lines from the telephone company terminate. The NID can accommodate several different phone lines. You can wire each line to a separate telephone or connect more than one phone to a particular line by daisy-chaining them or branching the wires out from the NID. Telephone wiring isn’t difficult, it’s safe and it doesn’t have to be confusing, as long as you keep track of the wire colors. Tips Writer Bio
