Richard J Crouse

US Patent:

39394174, Feb 17, 1976

Filed:

Dec 18, 1973

Appl. No.:

5/425908

Inventors:

Gary A. Cannalte - Hoffman Estates IL
Richard J. Crouse - Palatine IL
Richard D. Koenig - Elgin IL
Thomas J. Rollins - Arlington Heights IL
Donald L. Walker - Addison IL

Assignee:

Motorola, Inc. - Chicago IL

International Classification:

H04B 714
H04B 140

US Classification:

325 5

Abstract:

A control console including a transceiver, a plurality of terminal stations positioned at spaced apart locations remote from the console and each including a transceiver connected to the console by RF or a wire line, and a plurality of call boxes positioned at spaced apart locations adjacent to each terminal station and including a transceiver in communication with the terminal station. When the hand set of a call box is lifted from the cradle a tone is transmitted through the adjacent terminal station to the console which then keys on all terminal station transmitters to indicate a busy line at other call boxes and to provide a ringing signal at the call box being used. Subsequent to transmission of the tone, a signal indicative of the address of the box and the condition of predetermined portions of the box is automatically transmitted to the console. When the console operator answers, full duplex communication is provided between the call box and the console.