Line protection switch equipment

摘要

A line protection switch equipment (LPSW) in a communication system, having a plurality of two-input and two-output switches connected between lines including a protection line and working lines, the switches being connected in series by a loop line which forms a loop, whereby by switching the switches connected to a faulty working line and to a protection line, the faulty working line is switched to become a protection line, and the former protection line becomes a working line.