Operator supervisory circuit for a key telephone system

Details Operator supervisory circuit for a key telephone system Operator supervisory circuit for a key telephone system

1976-03-23

1977-06-14

Claffy, Kathleen H.

H04M 100

Patent

active

040299090

ABSTRACT:
A switching arrangement coupled to an operator's subset, a called party's subset, a source of key system positive ground, a supervisory indicator lamp and a line button lamp operates to light the indicator lamp when the operator's subset is taken off-hook to answer an incoming call, to cause the line button lamp to wink when the operator's subset is placed on hold to disperse the incoming call to a called party's subset, to extinguish the indicator lamp and the line button lamp wink when the called party's subset is taken off-hook and to cause the line button lamp to again wink when the called party's subset is placed on hold after the called party's subset has been taken off-hook.

REFERENCES:
patent: 3395256 (1968-07-01), Limiero et al.
patent: 3609249 (1971-09-01), Piwede
patent: 3752936 (1973-08-01), Morse
patent: 3906168 (1975-09-01), McEowen

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