Multiplex communications – Wide area network – Packet switching
Patent
1996-04-29
1999-01-12
DeCady, Albert
Multiplex communications
Wide area network
Packet switching
39520069, 370216, G01K 3108
Patent
active
058599592
ABSTRACT:
A dual-connection option allows preservation of network connectivity to a device or path by providing a second, redundant connection which takes over if a first connection fails. One goal is to provide communication with all critical devices at all times. If the ability to communicate with a device is lost because part of the connection to the device or the device itself has been destroyed, recovery from such loss is provided. The invention is preferably embodied in a particular implementation of the proposed Redundant Links standard, and satisfies the requirements of the proposed IEEE 802.12 standard, while adding specific enhancements to the proposed standard, such as storing and/or reporting conditions that lead up to a failure; accommodating minor, temporary disruptions; allowing status inquiries with regard to a redundant link while maintaining a primary connection; and continuing testing the redundant link after an initial verification.
REFERENCES:
patent: 4490788 (1984-12-01), Ramussen
patent: 5260945 (1993-11-01), Rodeheffer
patent: 5485465 (1996-01-01), Liu et al.
patent: 5506956 (1996-04-01), Cohen
patent: 5623482 (1997-04-01), Okanoue
Albrecht Alan
Kimball Karen
De'cady Albert
Hewlett--Packard Company
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