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

1976-04-23

1977-12-06

Cooper, William C.

179 18J, H04M 100

Patent

active

040618870

ABSTRACT:
A key telephone adapter unit providing interconnection between a key telephone instrument having a line selector unit with a plurality of lines and a corresponding plurality 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 telepone handsets by first and second conductor pairs.
The adapter unit responds to a serial data polling command received from the switching system over the data pair 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.

REFERENCES:
patent: 3604857 (1971-09-01), Opferman
patent: 3749848 (1973-07-01), Knollman et al.
patent: 3843845 (1974-10-01), Ridley
patent: 3935396 (1976-01-01), Barsellotti et al.
patent: 3973085 (1976-08-01), Shiff

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