Combined circuit and packet switched system

Details Combined circuit and packet switched system Combined circuit and packet switched system

1981-01-15

1983-07-05

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

3701101, H04J 312

Patent

active

043922228

ABSTRACT:
A new type of exchange system is disclosed which is suitable for the use in a facsimile communication system in which a large amount of information is transmitted in one direction, and the opposite direction has a small amount of information to be transmitted. According to the present invention, said large amount of information is transmitted using a circuit switching technique which assigns a fixed circuit to the forward direction to transmit said information, and a control signal or an acknowledgement signal in the backward direction from the receiving terminal, is handled through a packet switching technique in which a plurality of calls share a single transmission line or a time slot. Thus, a transmission line is used with the same efficiency as packet switching although information is transmitted mainly in one direction, and the switching load of the exchange is as small as in circuit switching.

REFERENCES:
patent: 3647949 (1972-03-01), Closs et al.
patent: 3796835 (1974-03-01), Closs et al.
patent: 4152548 (1979-05-01), Horiki

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