Ricky Raymond Mctee

US Patent:

63276704, Dec 4, 2001

Filed:

Jan 22, 1999

Appl. No.:

9/236060

Inventors:

Klaas Hellenthal - Ermelo, NL
Ricky Raymond McTee - Yorkville IL
Douglas Alan Reneker - Naperville IL
Gordon Douglas Woods - Randolph NJ
Wai-Ching Yu - Holmdel NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G06F 1120
G06F 1116
G06F 1200

US Classification:

714 5

Abstract:

A duplex controller with a pair of redundant processor circuits connected by an update bus for use in a system which requires high reliability. Each of the redundant processor circuits is individually capable of performing the tasks of the duplex controller, so that the controller remains operable when one of the processor circuit members fails. The update bus is connected so that when the active circuit member executes a write command, the write command is also effected at the standby circuit. In this manner the memory state of the standby is dynamically maintained so that when control of the duplex controller is transferred from the active to the standby to the standby circuit, the standby circuit is instantaneously ready with up to date information to assume all processing responsibilities of the duplex controller without unnecessary delay.