Control system for telephone switching system

Details Control system for telephone switching system Control system for telephone switching system

1979-02-09

1981-06-30

Robinson, Thomas A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

179 18ES, 340147SC, H04M 322, H04Q 354

Patent

active

042764513

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.

REFERENCES:
patent: 3409877 (1968-11-01), Alterman et al.
patent: 3812297 (1974-05-01), Borbas
patent: 3898386 (1975-08-01), Gaon
patent: 3908099 (1975-09-01), Borbas et al.
patent: 3920977 (1975-11-01), Karsas
patent: 4028676 (1977-06-01), Wolfer
patent: 4146749 (1979-03-01), Pepping et al.
Bell System Tech. Jour. for Sep. 1977, pp. 1040-1049 inclusive.

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