Immediate ring-back control system for time-division telephone e

Details Immediate ring-back control system for time-division telephone e Immediate ring-back control system for time-division telephone e

1977-12-13

1979-05-01

Cooper, William C.

179 15BY, H04M 302

Patent

active

041525485

ABSTRACT:
An immediate ring-back control system for a time-division telephone exchange includes a time-division switching network of a time switch-space switch-time switch (T-S-T) system. An incoming time switch accommodates multi-channel interrupted ring-back tones (IRBT's) which are generated by a tone generator in a time-multiplexed manner, each of which has a different interruption phase. The interrupted ring-back tone having a phase starting from a tone-sending period is selected from the multi-channel interrupted ring-back tones (IRBT's) by an immediate ring-back control circuit provided in a time-division switch driving circuit (SDC) at the time of connection of the ring-back tone to a calling subscriber, and a channel number corresponding to the phase of the interrupted ring-back tone is stored in a control memory or a time slot memory associated with the time switch, so that the transmission of the interrupted ring-back tones to a calling subscriber can be started from a mark portion thereof.

REFERENCES:
patent: 3378643 (1968-04-01), Goeller

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