| 摘要 |
The telephone system comprises a central unit 1, data terminal units 5l to 5n, and interface units 27l to 27n for communications between the central unit 1 and the data terminal units 27l to 27n, respectively. The central unit 1 includes a time switch 17 for executing exchange service and a control unit 19 for controlling the time switch 17. Each interface unit 27l to 27n is connected to the time switch 17 in communicable of communication-data and connected to the control unit 19 in communicable of control-data. Each interface unit 27l to 27n enables and disables the communication-data communications between each data terminal 5l to 5n and the time switch 17 in response to predetermined control commands received from each data terminal unit 5l to 5n.
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