OPTICAL PATH SIGNAL TERMINATION EQUIPMENT

摘要

In optical path signal termination equipment which converts between an SDH signal transmitted at the electrical level and an optical path signal transmitted at the optical level, an optical path supervisory signal is inserted in the optical path signal without increasing the signal length, by utilising the SDH section superviso ry signal area contained in the SDH signal as the area for the optical path supervisor y signal in the optical path signal.