Jennifer D L Fitzgerald

US Patent:

54737710, Dec 5, 1995

Filed:

Sep 1, 1993

Appl. No.:

8/115499

Inventors:

Margaret A. Burd - Thornton CO
Benny J. Ellis - Westminster CO
Jennifer T. Fitzgerald - Thornton CO
Barbara P. Havens - Broomfield CO
Jeremy R. Hutt - Denver CO
Janice A. Jones - Westminster CO
Timothy J. Lefoley - Louisville CO
Gary J. Mayer - Boulder CO

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

G06F 1134
G06F 1116
G06F 1120

US Classification:

39518202

Abstract:

A fault-tolerant call-processing adjunct processor comprises a redundant, duplicated, service unit provisioning and maintenance processor), a duplicated LAN connected to both service units, and plurality of served units (voice-processing processors) each connected to both LANs. Each service unit and each served unit has a duplicate copy of mission-critical information (customer records and commands). Both service units are continuously exercised by operating in an active-active configuration. The service units alternate the use of the LANs, thereby continuously exercising both LANs and providing independent duplicate sources of the mission-critical information to the served units. All sending units rely on having their mission-critical communications timely acknowledged by all receiving units. Served units retry with the other service unit those communications that failed with a preferred service unit. All units store failed communications for subsequent retry.