Terminal apparatus with a handset using a four pin connector

Details Terminal apparatus with a handset using a four pin connector Terminal apparatus with a handset using a four pin connector

1987-12-15

1989-09-05

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379377, H04M 100

Patent

active

048646067

ABSTRACT:
A communication terminal apparatus having a handset which includes a transmitter, a receiver and a hook switch. The handset is connected to the main body through a modular jack having four pins. The handset includes a bypass circuit for flowing a d.c. component therethrough by bypassing the transmitter or receiver and a capacitor, which is connected in parallel with the bypass circuit and in series with the transmitter or receiver, for cutting a d.c. component. Thus, the status information of the hook switch is applied to a signal line of the transmitter or receiver in a d.c. format superimposingly.

REFERENCES:
patent: 3627930 (1971-12-01), Tolman
patent: 4400589 (1983-08-01), Synek
patent: 4523056 (1985-06-01), Fisher

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