Paging intercommunication system

Details Paging intercommunication system Paging intercommunication system

G - Physics

08

B

179/4, 379/86

G08B 3/10 (2006.01) H04B 3/60 (2006.01) H04M 9/02 (2006.01)

Patent

CA 1037173

ABSTRACT OF THE DISCLOSURE Intercommunication between a plurality of stations is established through a pair of signal lines to which portable units are connected, each unit having its own power supply contributing to a low DC operating voltage main- tained across the signal lines through which the audio signals are also con- ducted. Communicate and pager switches associated with each unit respectively control signal connection, d.c. line-voltage level, and signal input impedance for establishing intercommunication and paging functions.

241812

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