Stand-alone keyphone system

Details Stand-alone keyphone system Stand-alone keyphone system

1984-12-17

1986-12-09

Dwyer, James L.

Telephonic communications

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

Detail of hold circuitry

200 5E, 379164, H04M 100

Patent

active

046281533

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 simultaneously 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 pushbuttons; and a set of line status LED's that indicate if the corresponding line is idle, ringing, busy or holding.

REFERENCES:
patent: 3927283 (1975-12-01), Kunimine
patent: 4011413 (1977-03-01), Phillips
patent: 4132860 (1979-01-01), Rasmussen
patent: 4169217 (1979-09-01), Szanto
patent: 4228324 (1980-10-01), Rasmussen et al.

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