Multiplex communications – Wide area network – Packet switching
Patent
1993-01-15
1995-07-25
Kizou, Hassan
Multiplex communications
Wide area network
Packet switching
370 79, 3701101, 370112, 370118, H04L 1200, H04J 1500, H04B 116
Patent
active
054368898
ABSTRACT:
A multiplexed communication system for automatically setting up a multiplexed call circuit between exchanges upon occurrence of a call only when the multiplexed call circuit is required while otherwise releasing the multiplexed call circuit. The multiplexed communication system includes a plurality of exchanges, each of which includes multiplexing/demultiplexing apparatus for compressing and multiplexing data inputted from first input/output to thereby output the compressed and multiplexed data to second input/output ports and for demultiplexing and expanding data inputted from the second input/output to thereby output the demultiplexed and expanded data to the first input/output port, control information messaging apparatus for messaging control information, first detection apparatus for detecting occurrence of a compressible call, and second detection apparatus for detecting that all the calls connected to the first input/output ports have been released. Upon detection of the compressible call by the first detection apparatus, a circuit is set up between the exchanges through the multiplexing/demultiplexing apparatus while the control information is transferred between the exchanges through the call control information messaging means, to thereby connect the call to the first input/output ports between the exchanges. When it is detected that all the calls connected to the first input/output ports have been released, the circuit between the exchanges is released.
REFERENCES:
patent: 4661974 (1987-04-01), Bales et al.
patent: 4823342 (1989-04-01), Morita et al.
patent: 5014266 (1991-05-01), Bales et al.
patent: 5031211 (1991-07-01), Nagai et al.
patent: 5051992 (1991-09-01), Taniguchi et al.
Kamiya Akihiro
Kurata Morihiko
Kuroyanagi Kansuke
Matsumoto Teruyuki
Hitachi , Ltd.
Hitachi Software Engineering Co. Ltd.
Kizou Hassan
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