Multiplex communications – Wide area network – Packet switching
Patent
1989-09-15
1991-07-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 851, 3701101, H04J 324, H04J 302
Patent
active
050311751
ABSTRACT:
A communication control method for use in a communication system including a plurality of communication control apparatuses interconnected through an information transmission path, each of the communication control apparatuses including a packet transmission/reception unit, a timer unit and a controller unit. When a first communication control apparatus has become unable to perform communication due to accidental power-off or a power supply failure or the like in the course of communication with a second communication control apparatus (which has been brought into a locked state by the first communication control apparatus), the invention prevents the second communication control apparatus from being left permanently in the locked state. In that case, the second communication control apparatus transmits a lock confirmation packet to the first communication control apparatus to make lock confirmation as to whether the locked state is to be maintained, when the second communication control apparatus does not receive any communication packet from the first communication control apparatus for a predetermined period of time. When no reply to the lock confirmation is received or alternatively when an unlock authorization packet is received by the second communication control apparatus, the second communication control apparatus releases itself from the locked state.
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Nederlandse Norm, Nederlands Electrotechnisch Comite (NEC), Ontwerp NEN-EN 50 049, May, 1985.
Hase Yukiko
Ikezaki Masao
Sasanuma Hiroshi
Tanaka Shotaro
Kizou H.
Matsushita Electric - Industrial Co., Ltd.
N. V. Philips' Gloeilampenfabricken
Olms Douglas W.
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