Patent ID: 7092362

Claim:
A repeater for interfacing between a digital service network and a local network span comprising: a first input port for connection to a first digital carrier link for coupling to a digital network; a first output port for connection to a second digital carrier link for coupling to digital terminal equipment; a first signal transmission path between the first input and output ports; a second input port for connection to the second digital carrier link for coupling to digital terminal equipment; a second output port for connection to the first digital carrier link fir coupling to a digital network; a second signal transmission path between the second input and output ports; a first selectably-activated loopback circuit which, when activated, provides a third signal transmission path between the first input port and the second output port; a second selectably-activated loopback circuit which, when activated, provides a fourth signal transmission path between the second input port and the first output port; and a controller coupled with the first and second selectably-activated loopback circuits configured to selectively activate the first and second selectably-activated loopback circuits individually and simultaneously.