Key telephone adapter for electronic telephone switching system

Details Key telephone adapter for electronic telephone switching system Key telephone adapter for electronic telephone switching system

H - Electricity

04

M

379/33

H04M 3/42 (2006.01) H04M 1/72 (2006.01)

Patent

CA 1076279

Abstract of the Disclosure A key telephone adapter unit providing interconnection between a key telephone in- strument having a line selector unit with a plurality of lines and a corresponding plur- ality of line status indicators and an electronic telephone switching system in which audio frequency voice information signals and supervisorial serial data signals are interfaced to individual telephone hand- sets by first and second conductor pairs. The adapter unit responds to a serial data polling command received from the switching system over the data part by converting signals representative of the status of each line of the associated key telephone instrument to serial data signals for transfer to the switching system over the data pair; and responds to other serial data commands received from the switching system over the data pair by generating command signals for directing operation of the line status indicators, e.g. the status lamps, the bell and the buzzer.

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