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

H - Electricity

04

M

379/33

H04M 1/72 (2006.01) H04M 3/62 (2006.01)

Patent

CA 1086880

AN OPERATOR SUPERVISORY CIRCUIT FOR A KEY TELEPHONE SYSTEM Abstract of the Disclosure 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. - 1 -

274071

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