Multiplex communications – Fault recovery
Reexamination Certificate
2002-10-31
2010-11-16
Sheikh, Ayaz R (Department: 2476)
Multiplex communications
Fault recovery
C370S245000, C370S248000, C370S338000, C370S392000, C370S395200, C709S223000, C709S231000, C709S238000, C709S242000
Reexamination Certificate
active
07835265
ABSTRACT:
A high availability backplane architecture. The backplane system includes redundant node boards operatively communicating with redundant switch fabric boards. Uplink ports of the node boards are logically grouped into trunk ports at one end of the communication link with the switch fabric boards. The node boards and the switch fabric boards routinely perform link integrity checks when operating in a normal mode such that each can independently initiate failover to working ports when a link failure is detected. Link failure is detected either by sending a link heartbeat message after the link has had no traffic for a predetermined interval, or after receiving a predetermined consecutive number of invalid packets. Once the link failure is resolved, operation resumes in normal mode.
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Chang Rong-Feng
Lin Eric (Changhwa)
Wang Linghsiao
Yik James Ching-Shau
Conexant Systems Inc.
Haliyur Venkatesh
Sheikh Ayaz R
Thomas Kayden Horstemeyer & Risley LLP
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