Telephone system

Details Telephone system Telephone system

1991-03-26

1994-04-12

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701101, 379 88, H04J 324

Patent

active

053032390

ABSTRACT:
The telephone system comprises a central or key service unit 1, data terminal units 5.sub.1 to 5.sub.n, and data set circuits of data terminal interface units 27.sub.1 to 27.sub.n for communications between the central unit 1 and the data terminal units 5.sub.1 to 5.sub.n, 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 27.sub.1 to 27.sub.n is connected to the time switch 17for communication of communication-data and connected to the control unit 19 for communication of control-data. Each interface unit 27.sub.1 to 27.sub.n enables and disables communication of communication-data between each data terminal 5.sub.1 to 5.sub.n and the time switch 17 in response to predetermined control commands received from each data terminal unit 5.sub.1 to 5.sub.n.

REFERENCES:
patent: 4553235 (1985-11-01), Svensson
patent: 5018195 (1991-05-01), Hall
patent: 5023868 (1991-06-01), Davidson et al.
patent: 5062133 (1991-10-01), Melrose

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