Intercom telephone

Details Intercom telephone Intercom telephone

1988-05-12

1991-02-26

Dwyer, James L.

Telephonic communications

Multi-line or key substation system with selective switching...

With intercom system

379159, 379163, 370 691, 370 71, 370 30, H04J 114, H04M 1106

Patent

active

049967096

ABSTRACT:
An intercom system for use in combination with a multi-line telephone system wherein the intercom system utilizes the same wire pair for communications between intercom units that is used for normal telephone communications. The intercom system transmits voice signals on two or more frequency modulated channels over a wire pair of a local telephone network. Each intercom unit includes a microprocessor which controls communication activity and protocol in each unit and communicates with other intercom unit miroprocessors via a separate frequency modulated digital signal channel.

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