| 摘要 |
PURPOSE:To connect two or more terminals at the same time, by time division- multiplexing a network control signal and a communication data between terminals, and making independent both the signals. CONSTITUTION:When a subscriber sends out a request signal to the switchboard 2 in the course of communication a data between data terminals, the request signal is transferred to the switchboard through the connection route of the network control signal transmission and receiving circuit 5-multidemultiplexer 4-subscriber's line 11-demultiplexer 6-the control signal transmission and receiving circuit 8. That is to say, the network control signal and the communication data are time division- multiplexed, both the signals are made independent, and both the signals are not restricted mutually. Accordingly, a control signal is sent freely when a data is being communicated. |
