Keyboard type telephone station adapted to transmit dialling pul

Details Keyboard type telephone station adapted to transmit dialling pul Keyboard type telephone station adapted to transmit dialling pul

1975-02-10

1976-10-26

Claffy, Kathleen H.

179 2DP, H04M 130, H04M 150

Patent

active

039885496

ABSTRACT:
Telephone set arrangement designed to be used as a computer terminal. It has a first call generator transmitting call pulse trains and a second call generator transmitting call multifrequency signals. During the call, the two kinds of call signals are transmitted simultaneously. After completion of the call, the supply current is reversed as usual. The current reversal is detected and the pulse train generator is then blocked. Any transmission of signals after completion of the call is then made only in the form of multifrequency signals.

REFERENCES:
patent: 3301957 (1967-01-01), Germond et al.
patent: 3371162 (1968-02-01), Scantlin
patent: 3541262 (1970-11-01), Yachabach
patent: 3652795 (1972-03-01), Wolf et al.
patent: 3728490 (1973-04-01), Nowicki
patent: 3778556 (1973-12-01), Mees et al.
patent: 3920926 (1975-11-01), Lenaerts et al.
patent: 3932709 (1976-01-01), Hoff et al.

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