Serving Area Interface (SAI)

A serving area interface is part of a phone company's outside plant. It is a fancy name for a box on a pole, a box attached to a wall or a box in the ground that connects the phone company's feeder or subfeeder cables (those coming from the central office) to the drop wires or buried service wires that connect to the customer's premises. It's also called a cross-wire box.

(See below for picture of a typical grounded Serving Area Interface)




Source: http://upload.wikimedia.org/wikipedia/en/thumb/9/9d/1200_pair_SAI.jpg/180px-1200_pair_SAI.jpg