Key telephone line circuit tone-on-hold arrangement

Details Key telephone line circuit tone-on-hold arrangement Key telephone line circuit tone-on-hold arrangement

1976-07-28

1977-11-01

Claffy, Kathleen H.

H04M 172

Patent

active

040566951

ABSTRACT:
There is disclosed a circuit for generating tone signals from clocking signals present on each key telephone line circuit. The tone signals are transformer coupled onto the communication leads by an optional plug-in-board arrangement. In present installations music-on-hold is provided by connecting an external music source to each line card. There is also disclosed an arrangement for utilizing the optional plug-in-board to provide either tone-on-hold or music-on-hold by simply reversing a plug-in connector.

REFERENCES:
patent: 3865995 (1975-02-01), Kerman et al.
patent: 3895192 (1975-07-01), Angner et al.
patent: 3925625 (1975-12-01), Angner et al.
patent: 3965308 (1976-06-01), Jones et al.

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