Digit storer for telecommunication system

Details Digit storer for telecommunication system Digit storer for telecommunication system

1975-10-29

1977-08-16

Brown, Thomas W.

H04Q 130

Patent

active

040427846

ABSTRACT:
A storage network co-operating with a marker comprises a shift register whose stages are loaded in parallel with the digits of a call number received from a local subscriber, the first digit or digits of that call number being read out to an associated marker as an identification of a remote junction to which the call is to be extended via a transmission path selected under the control of that marker. When the marker has received enough digits to perform the switching operation linking the subscriber line with the selected transmission path, it activates a pulse generator which energizes an output lead in parallel with a counter whose reading is successively compared with the remaining digits still stored in some of the stages of the shift register. A comparator making this comparison, upon detecting a match between the pulse count and a stored digit, blocks the further readout of pulses to the output lead for an interdigit pause determined by a timer. At the end of that interval, the timer controls the switchover of one of the comparator inputs to the next shift-register stage and resets the counter whereupon the procedure is repeated until all the digits have been read out. The pulse rate and the interdigit pause may be modified, under the control of the marker, according to the selected junction.

REFERENCES:
patent: 3671677 (1972-06-01), Lee, Jr. et al.
patent: 3725598 (1973-04-01), Braun et al.
patent: 3851110 (1974-11-01), Kelly et al.
patent: 3931476 (1976-01-01), Matthews

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