Ring sensing circuit for use with a service evaluation system

Details Ring sensing circuit for use with a service evaluation system Ring sensing circuit for use with a service evaluation system

1978-09-13

1979-12-11

Robinson, Thomas A.

179 18FA, H04M 100

Patent

active

041784863

ABSTRACT:
A ring sensing circuit for use in conjunction with a line connected between a subscriber and a switching center. The subscriber line is monitored by a service evaluation system. The ring sensing circuit in response to a microprocessor controller, detects the application of low frequency AC ringing signals applied by the switching center to the subscriber line. As a result of this ringing signal detection, the microprocessor determines that a terminating call is pending, and instructs the associated switching equipment not to switch this particular call to a service evaluation operator.

REFERENCES:
patent: 3441683 (1969-04-01), Herter
patent: 3653018 (1972-03-01), Budrys

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