Pay telephone applique for subscriber carrier telephone system

Details Pay telephone applique for subscriber carrier telephone system Pay telephone applique for subscriber carrier telephone system

H - Electricity

04

M

379/11, 379/36,

H04M 17/02 (2006.01) H04Q 1/442 (2006.01)

Patent

CA 1056525

ABSTRACT An out-of-band signaling method and apparatus are provided to facilitate the adaptation of payphones to telephone systems, as for example subscriber carrier systems. Part of the speech band is made unavailable to the subscribers and is employed for signaling DC line conditions from one end of the telephone system to the other.

253452

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