| 摘要 |
A switching system utilizing an end marked network has circuitry for detecting the presence of double marks on either side of the network. The network functions in the conventional manner to complete a connection between a line side and a trunk side circuit in response to the application of a single mark on each side. In response to the simultaneous application of two or more marks to either side, the detection circuitry recognizes this as a trouble condition, generates an alarm signal, and prevents the network from attempting to respond to the simultaneously applied marks.
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