| 摘要 |
Automatic protection switching is implemented by channel devices in a data communication system node. Each channel devices includes input and output ports, a data receive port, a data send port, and a signal routing arrangement controlled by a processor element. The signal routing arrangement routes data between the channel devices such that, in the event of a channel failure, one channel device functions as a protection channel device. In a normal operating mode, each channel device routes data from its data receive port to its data send port, and routes data from its input port to its output port. In a protection mode, the protection channel device (and the protected channel device) routes data from its data receive port to its output port, and routes data from its input port to its data send port, while the remaining working channel devices function in the normal operating mode.
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