End-of-keying control circuit

Details End-of-keying control circuit End-of-keying control circuit

1978-05-30

1980-01-29

Konick, Bernard

179 16EC, H04Q 150, H04Q 347

Patent

active

041862783

ABSTRACT:
A TOUCH-TONE signal to dial pulse converter arrangement isdisclosed in a step-by-step system. The arrangement is equipped with a plurality of trunk circuits interposed between line finder and selector switches for extending calls from TT (TOUCH-TONE) telephones through a switching network to a lesser plurality of TT to DP (Dial Pulse) converters. Each of the converters is time slot connected to a common translator under control of a time slot allotter. The common translator includes a single end-of-keying control circuit having decoders, a cross-connection terminal field, a combinational logic circuit, an encoder and a comparator for cooperating with all of the converters successively in individually assigned time slots to determine when the end-of-keying occurs on each call served by the converters.

REFERENCES:
patent: 2680781 (1954-06-01), Avery
patent: 3127479 (1964-03-01), Macurdy et al.
patent: 3133155 (1964-05-01), Kuchas
patent: 3159716 (1964-12-01), Riddell et al.
patent: 3204040 (1965-08-01), Hackett
patent: 3291913 (1966-12-01), Hanna et al.
patent: 3322900 (1967-05-01), Winter
patent: 3328530 (1967-06-01), Schildgen et al.
patent: 3985973 (1976-10-01), Shea

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