Patent ID: 6452701
Filing Date: 2002-09-17
Classification: H04B,H04J,H04Q

Abstract:
A supervisory system in an optical wavelength-multiplexed communications network, comprising:at least one optical wavelength multiplexing/demultiplexing unit; a plurality of terminal stations connected to at least one optical wavelength multiplexing/demultiplexing unit through an optical transmission line, each having a loopback path to loop back a supervisory signal sent to the terminal station on a first transmission line so as to pass the supervisory signal to a second transmission line, which carries signals in an opposite direction to that of the first transmission line; and a plurality of optical repeater units provided in the first and second optical transmission line each having a supervisory signal receiving unit, to determine whether or not the supervisory signal received by the optical repeater was directed to the optical repeater and to send a response signal including information regarding a state of the optical repeater unit wherein the supervisory signal transmitted for said optical repeater units from a first terminal station of said plurality of terminal stations is received by a second terminal station through said optical wavelength multiplexing/demultiplexing unit, and the received supervisory signal is transferred to a third terminal station through said optical wavelength multiplexing/demultiplexing unit.