Telephone circuit for ringing rhythm generation and off hook...

Details Telephone circuit for ringing rhythm generation and off hook... Telephone circuit for ringing rhythm generation and off hook...

H - Electricity

04

M

379/12

H04M 3/02 (2006.01) H04M 19/02 (2006.01)

Patent

CA 1153838

ABSTRACT There is disclosed herein a telephone circuit for generating a ringing rhythm and for off-hook detection, which is able to interface a subscriber line and a subscri- ber line circuit under the supervision of the control units of an exchange; when these order the telephone circuit to send a ringing signal, it generates the ringing rhythm, in order to drive a relay capable of interconnecting the sub- scriber line and a ringing current generator, and it inter- rupts the ringing rhythm when, due to off-hook, the positive half-periods of the ringing current have a duration that differs in a predetermined degree from the duration of the negative half-periods.

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