| 摘要 |
An integrated voice-and-data communication system is disclosed wherein voice-and-data channels are frequency multiplexed and switched through a wideband switching network on a common four-wire path. When the switching connection is being established, coupler-and-detector circuits couple the voice channel, demultiplexed to baseband, to the network so that network control signals in the voice channel can be employed to establish the connection. The control signals, however, are isolated by the coupler-and-detector circuits from the outgoing data channel. When the switching connection has been established, the coupler-and-detector circuits disconnect the baseband voice channel and connect frequency multiplexed voice and data signals to the common four-wire path through the network.
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