The disclosure relates generally to a system of restoring communication
circuits. The system includes an automated circuit switchover system
embedded within a telephone central office, a technician terminal for use
by telephone network operations personnel, a test and control system
coupled to the technician terminal and to the automated circuit
switchover system within the telephone central office, and a switchable
protection circuit remotely located from the telephone central office and
coupled to the telephone central office via a communication link. The
switchable protection circuit supports a plurality of active individual
communication lines and an unused spare communication line. Each of the
active individual communication lines are configured to support
communication of traffic from end user subscribers supported by the
active individual communications lines connected to the switchable
protection circuit and to the telephone central office. The switchable
protection circuit is responsive to the test and control system and
includes logic to respond to a specific command sent from the test and
control system to switch a selected one of the plurality of active
individual communication lines to the unused spare communication line and
to activate the spare communication line in response to the specific
command to support communications traffic over the spare communication
line.