Ernest S Lee

US Patent:

42764513, Jun 30, 1981

Filed:

Feb 9, 1979

Appl. No.:

6/010910

Inventors:

Otto W. Beebe - Maitland FL
Ernest O. Lee - Longwood FL
Richard I. Subrin - Alta Monte Springs FL
Barrie Brightman - Fern Park FL
George C. Hanson - San Antonio TX

Assignee:

Stromberg-Carlson Corporation - Tampa FL

International Classification:

H04M 322
H04Q 354

US Classification:

1791752C

Abstract:

A fault monitoring and diagnostic system for a telephony switching system. Two call processing systems connect through a programmable switch to port group units that receive individual telephone lines. All signals from the port group units are conveyed to both call processing systems, and the call processing systems operate in synchronism. However, the programmable switch conveys signals back to the port group units from only one of the call processing systems. Fault monitoring and diagnostic circuitry monitors various conditions within the telephony switching system. A test call generator automatically performs test calls thereby to diagnose system problems. If a fault is detected, the fault monitoring and diagnostic system controls the programmable switch and, in appropriate circumstances, couples the output signals from the other call processing system to the port group units. Information concerning the nature of the fault is also provided.