Key telephone system having interstation signalling during hold

Details Key telephone system having interstation signalling during hold Key telephone system having interstation signalling during hold

1979-05-14

1980-10-14

Brigance, Gerald L.

179 99A, 179 84SS, H04M 100

Patent

active

042283248

ABSTRACT:
In a key telephone system of the type that uses the tip and ring conductors of a telephone line to transmit a hold condition control signal between stations, interstation signal-generating and detecting circuitry are provided at first and second stations, respectively, for enabling the first station to actuate, during a hold condition on the line, an audible signalling device, such as a buzzer, located at the second station. The interstation signal is generated on command by selective actuation of a hold switch button at the first station, and is transmitted over the line as an altered hold control signal, which is detected at the second station. Upon such signal detection, a buzzer is energized alerting the second station to the presence of a held call on the line.

REFERENCES:
patent: 1651017 (1927-11-01), Deakin
patent: 3725600 (1973-04-01), Hutton
patent: 3961142 (1976-06-01), Caffine
patent: 4011413 (1977-03-01), Phillips
patent: 4090038 (1978-05-01), Biggs
patent: 4100375 (1978-07-01), Noller
patent: 4132860 (1979-01-01), Rasmussen
patent: 4133985 (1979-01-01), Rasmussen et al.

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