Systems and methods are described for fault detection for subscriber loop
repeaters. A method includes monitoring an upstream signal on a digital
subscriber loop for a fault detection signal that is added to said
upstream signal at a repeater; and determining if a fault has occurred. An
apparatus includes a digital subscriber loop fault detection system
including: a receiver circuit that monitors an upstream signal on said
digital subscriber loop for a fault detection signal that is added to said
upstream signal at a repeater; and a logic circuit that determines whether
a fault has occurred.
