Speakerphone test set

Details Speakerphone test set Speakerphone test set

1991-09-20

1993-03-09

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Using portable test set

379388, 379420, H04M 908

Patent

active

051931079

ABSTRACT:
A telephone test set that performs dry loop testing of telephone lines has a passive speech network, a speakerphone circuit, and an amplifier and a speaker coupled to the speakerphone circuit. The passive speech network and the speakerphone circuit area isolated by the use of latching relays which are switched by a relay driver circuit that provides a short current burst. Line power can be used to power the speakerphone, so as to extend battery life of a battery which can augment the line power as needed.

REFERENCES:
patent: 4691336 (1987-09-01), Durston
patent: 4856057 (1989-08-01), Smith et al.

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