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

1977-12-29

1979-10-09

Robinson, Thomas A.

179 18HB, 179 84R, H04J 312

Patent

active

041707184

ABSTRACT:
An immediate ring-back control system in a time-division telephone exchange comprising a time-division switching network of an incoming time switch-space switch-outgoing time switch (T-S-T) system. A continuous ring-back tone is supplied to a plurality of successive addresses of the incoming time switch and an interrupted ring-back tone is supplied to at least one address thereof. Upon connection of the ring-back tone, a first address number of the successive addresses supplied with the continuous ring-back tone is written into a control memory corresponding to the time switch while the successive addresses are sequentially increased for each count of a timing pulse generated periodically. The content of the control memory is modified by the address number successively increased and the successive address numbers are modified to the address number to which the interrupted ring-back tone is supplied, thereby to reduce a post dialling delay.

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