Four-wire telephone system with self-test means

Details Four-wire telephone system with self-test means Four-wire telephone system with self-test means

1984-05-03

1986-01-28

Schreyer, Stafford D.

1791751R, 1791753F, H04M 124

Patent

active

045673322

ABSTRACT:
A four-wire "hoot-and-holler" telephone system provides full duplex conference communication. Four-wire desksets are provided for individual users, being connected by a four-wire telephone circuit. Repeaters at each end of the four-wire circuit provide incoming and outgoing amplification or attenuation for the desksets. Each such deskset includes a console with a speaker and a volume control for the speaker. Four-wire desksets are included in the system for connection to the telephone circuit in lieu of the repeater and the desksets. Each testset includes a self-test circuit and a switch feature for switching between normal and self-test operations. The testset includes also circuitry for allowing it to be used as a substitute for the desksets and the repeater as a stand-alone telephone set. Talk battery is provided by a local power supply of the test set. The testset provides user assurance of proper system operation at any location where utilized, and allows ready verification of the existence of a system fault, as within the four-wire circuit, or within the repeater and four-wire desksets.

REFERENCES:
patent: 3185781 (1965-05-01), Lueft et al.
patent: 4323738 (1982-04-01), Merrick

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