H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/1
H04B 10/00 (2006.01) H04B 1/74 (2006.01)
Patent
CA 2033696
A communication system includes a plurality of stations, a first working line coupling adjacent stations among the plurality of stations, a second working line passing predetermined stations among the plurality of stations without dropping therein, and a protection line provided in common for the first working line and the second working line, a supervisory signal always passing through the protection line. Each of the stations includes an internal circuit for receiving an input transmission signal from the first working line and sending an output transmission signal to the first working line. Each station also includes a switching portion for passing the protection line without dropping in each of the stations in a normal mode and for connecting the protection line to the internal circuit in an alarm mode so that the input transmission signal is received from an upstream side via the protection line instead of the first working line and the supervisory signal which is generated from the output transmission signal toward a downstream side via the protection line.
Ikawa Fumihiro
Kurokawa Masumi
Nishimura Koichi
Taniguchi Ikuo
Fetherstonhaugh & Co.
Fujitsu Limited
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