Multiplex communications – Wide area network – Packet switching
Patent
1983-02-03
1985-10-08
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
371 25, H04J 116, H04J 314
Patent
active
045464677
ABSTRACT:
A monitoring device for monitoring the status of communication units connected to a common transmission medium. The monitoring device sequentially addresses each communication unit and transmits to the addressed unit an inquiry frame which includes in addition to the destination address, a source address field and a control information field. The addressed communication unit, if operating responds with a reply frame including the destination address of the monitor, its address, and a status information field. The received status information is compared with a previously received status information from the addressed control unit, and a primary fault is indicated when the compared informations do not coincide. A secondary fault is indicated if no reply frame is received from an addressed communication unit within a predetermined time from the transmission of the inquiry frame.
REFERENCES:
patent: 3219927 (1965-11-01), Topp, Jr. et al.
patent: 4138599 (1979-02-01), Munter
patent: 4208552 (1980-06-01), Castriotta et al.
patent: 4245250 (1982-08-01), Jacobsthal
patent: 4320508 (1982-03-01), Takezoe
patent: 4439763 (1984-03-01), Limb
patent: 4476561 (1984-10-01), Baackman et al.
1st International Conference on Distributed Computing Systems, "Architecture Considerations for Local Computer Networks"; Thurber et al.; Oct. 1979; pp. 131-142.
Electronics, "Local Network Gives New Flexibility to Distributed Processing"; Bass et al.; Sep. 25, 1980; pp. 114-212.
Nippon Electric Co. Ltd.
Olms Douglas W.
Scutch III Frank M.
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