Telecommunications transmission and signalling circuits

Details Telecommunications transmission and signalling circuits Telecommunications transmission and signalling circuits

1976-11-23

1978-03-14

Robinson, Thomas A.

H04M 322, H04B 346

Patent

active

040792080

ABSTRACT:
A d.c. signal detector circuit for a telephone exchange which comprises a level detector which is so connected that it can sense current flowing in a telephone line. The level detector is arranged to switch states when a loop is established in a telephone circuit. Two level detectors can be employed to sense the establishment of a loop, a coin pulse, or an earth loop.

REFERENCES:
patent: 3622709 (1971-11-01), Tjaden
patent: 4020294 (1977-04-01), Kitajewski et al.

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