| 摘要 |
A transmitting apparatus has a plurality of optical signal transmitters, a plurality of transmitting transponders for converting the wavelengths of optical signals transmitted from the optical transmitters into respective wavelengths and transmitting wavelength-converted optical signals, a wavelength-division-multiplexer for wavelength-division-multiplexing the wavelength-converted optical signals, and an auxiliary transmitting transponder for converting a wavelength of an optical signal transmitted from the optical signal transmitters into a wavelength different from the wavelength-converted optical signals, and transmitting an auxiliary wavelength-converted optical signal. The transmitting transponders are monitored by a supervising unit, which outputs a detected failure signal when it detects a failure of one of the transmitting transponders. In response to the detected failure signal, a transmission switch supplies an output signal from the auxiliary transmitting transponder, rather than the output signal from the failing transmitting transponder, to the wavelength-division-multiplexer. A supervising control signal transmitting unit transmits a supervising control signal to an optical transmission path. In response to the supervising control signal, a receiving apparatus switches from a receiving transponder corresponding to the failing transmitting transponder to a receiving auxiliary transponder.
|
