Multiplex communications – Wide area network – Packet switching
Patent
1988-02-12
1989-08-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 94, H04J 326
Patent
active
048582280
ABSTRACT:
A communication system employing a multi-conjunction architecture has a supervising circuit for supervising whether or not a returning signal is received from a destination terminal device in response to a sending signal. When no returning signal is detected within a specific time after the sending signal is transmitted, a communication path used for transmitting the sending signal is isolated from rest of the communication system, or a pseudo returning signal is outputted from the supervising circuit to fix a communication path used for transmitting the sending signal and the pseudo returning signal. As a result, communication paths other than that used for transmitting the sending signal may be used for other communications when the returning signal is not detected for the specific time.
REFERENCES:
patent: 4276643 (1981-07-01), Laprie et al.
patent: 4380063 (1983-04-01), Janson et al.
patent: 4393381 (1983-07-01), Seiden
patent: 4399531 (1983-08-01), Grande et al.
patent: 4443875 (1984-04-01), Blausten
patent: 4482996 (1984-11-01), Wilson et al.
patent: 4602364 (1986-07-01), Herman et al.
Jung Kim Min
Olms Douglas W.
Ricoh & Company, Ltd.
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