Device used to test integrity of T1 circuits remotely from the central office. Installed on the customer premises, the Smart Jack is completely passive until activated remotely by a digital code.
A connector device that is installed by the LEC at the Demarc which provides the customer with the physical connection to their DS-1 service and provides the LEC the ability to perform diagnostic testing on the circuit.
Synonym for a device that is used to interconnect the Go and Return paths of a circuit at the incoming end, and through which the detection of an incoming check tone transmits another check tone to permit a continuity checking of a 2-wire circuit.