Key telephone line shunt detector circuit

Details Key telephone line shunt detector circuit Key telephone line shunt detector circuit

H - Electricity

04

M

379/33

H04M 3/42 (2006.01) H04M 9/00 (2006.01)

Patent

CA 1149530

- 14 - KEY TELEPHONE LINE SHUNT DETECTOR CIRCUIT Abstract A line circuit is disclosed for controlling communications over a communication pair between a switching machine and a key telephone station. The line circuit includes a dual sensitivity shunt detector arrangement for improved detection of dc transients and ac ringing voltage signals appearing across the pair. A current diverter circuit switches the sensitivity of the shunt detector arrangement depending on the operating state of the key telephone station.

383630

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