Multiplex communications – Wide area network – Packet switching
Patent
1989-09-08
1991-05-14
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 854, 370 8513, 370 943, H04J 314
Patent
active
050162446
ABSTRACT:
A method by which redundant network interface modules (NIMs) interconnecting the communication buses of two local area networks communicate with one another at predetermined time intervals over the communication buses of both networks. A first NIM of a redundant pair of NIMs is designated as the primary and a second NIM of the redundant pair is designated as the secondary. Contents of the information communicated between the NIMs over the communication bus of the first network includes the status of the transmitting NIMs ability to communicate with the second network and the information communicated between the NIMs over the communication bus of the second network includes the status of the transmitting NIM's ability to communicate with the first network. Based on the information exchanged, the failure of the NIMs to communicate as scheduled, and the internal status of each NIM as understood by that NIM, the NIMs decide when failover from the primary NIM to the secondary NIM occurs.
REFERENCES:
patent: 4410983 (1983-10-01), Cope
patent: 4596012 (1986-06-01), Reed
patent: 4797881 (1989-01-01), Ben-Artzi
patent: 4831617 (1989-05-01), Iwasaki
patent: 4845609 (1989-07-01), Lighthart et al.
patent: 4847837 (1989-07-01), Morales et al.
Drobish Renee
Massey, Jr. W. Russell
McLaughlin Paul F.
Honeywell Inc.
Hsu Alpus H.
Lenkszus D.
Medved A.
Olms Douglas W.
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