| 摘要 |
A transmission network nodes, including electronically controlled distributors so that, in the case of a failure of a path, a substitute path can be switched in very rapidly. Switching orders sent to the nodes from a controller include an unambiguous designation of the digital path to be switched, and the source network node passes this designation on to the subsequent network nodes, so that the subsequent nodes can check their switching. Alarm signals which are normally passed on transparently from node to node are converted to a substitute digital signal (EDS) with a standardized frame structure so that the alarm can be transmitted to the end of the path without issuing alarms at each node. The unambiguous path designation and the substitute digital signal (EDS) may both be transmitted without interfering with each others.
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