Essential user bypass circuit for telephone switching system

Details Essential user bypass circuit for telephone switching system Essential user bypass circuit for telephone switching system

1978-06-20

1979-07-03

Cooper, William C.

179 18B, H04M 342, H04Q 342

Patent

active

041601300

ABSTRACT:
An essential user bypass circuit for use in switch units of a telephone switching system. Telephone subscribers at each switch unit are able to communicate with each other and with subscribers at other switch units via associated subscriber apparatus and trunk group lines interconnecting the switch units. All call processing operations, including the formation of "from-to" address signals for connecting subscribers with each other and with trunk group lines, are normally controlled by a processor unit (containing dual processors) at each switch unit. In the event of malfunction or failure of a processor unit or of certain other associated subscriber hardware, an essential user bypass circuit may be actuated in accordance with the invention, for example, by a manual switch, to bypass the malfunctioning or failed equipment to allow certain ones of the original subscribers, for example, ten percent of the original subscribers at the switch unit, to be connected with trunk group lines thereby to maintain communication with subscribers at other switch units. The connection of subscribers with trunk group lines is accomplished by the prestorage of a limited number of "from-to" address signals therein which are like those normally produced by the processor unit and which may be applied to the subscriber apparatus upon the malfunction or failure of equipment to cause the subscriber apparatus to establish the particular connections specified by the address signals.

REFERENCES:
patent: 3573389 (1971-04-01), Greenstein et al.
patent: 3702905 (1972-11-01), Gil

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