Stand-alone keyphone system

Details Stand-alone keyphone system Stand-alone keyphone system

H - Electricity

04

M

379/33

H04M 3/42 (2006.01) H04M 9/00 (2006.01)

Patent

CA 1230693

A STAND-ALONE KEYPHONE SYSTEM ABSTRACT A stand-alone keyphone system that is designed to be installed at any location where it is desired that a plurality of telephone lines be available to each of many user points. The system operates independently of all other systems and without the need for a KSU or a central control unit. Each system allows a plurality of telephone lines to be connected and operated simul- taneously and a plurality of systems may be connected within each installation with minimal loading of telephone lines. The system comprises, within a single housing, a DTMF telephone set and a key adapter set that further comprises all the mechanical and electronic circuits to operate the system including a switching subsystem and hold circuit subsystem. The system incorporates a hold pushbutton for placing any of the telephone lines on hold, a set of four telephone line accessing push- buttons; and a set of line status LED's that indicate if the corresponding line is idle, ringing, busy or holding.

476636

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