Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Patent
1986-11-03
1988-02-16
Schreyer, Stafford D.
Telephonic communications
Multi-line or key substation system with selective switching...
Detail of hold circuitry
H04M 100
Patent
active
047260580
ABSTRACT:
A telephone conversion device for converting a multiple line electromechanical telephone system having an electromechanical key system unit (KSU) for use with electronic telephones. Each conversion device includes a wall unit having a 50-pin connector for mating with the 50-pin connector of the KSU outlet cable, and a keystrip unit positionable on the desk of the user and upon which an electronic telephone is positioned. A slender 8-wire cord extends between the keystrip and wall units. The wall unit includes a first microprocessor which operates with a line status detector for determining the operational status of five multiple telephone lines by sensing the lamp driving signals provided by the KSU. Relays under the operation of the first microprocessor connect a selected line to a common talking pair which extends within the cord between the units for connection to the telephone. A detector detects when the receiver is off-hook. The keystrip unit includes a second microprocessor which operates with a switch scanning detector to sense the operation of five momentary contact line selection switches, each corresponding to one of the lines, and a momentary contact hold switch. Five pair of line status lights are provided, one pair being positioned adjacent to each of the line selection switches and selectively emitting red or green color light. Based upon information from the detectors the microprocessors control operation of the status lights and the relays. The first microprocessor maintains a hold-queue indicating which of the lines have been put on hold by the user and the order the lines were put on hold, and can automatically select a line for connection from the hold-queue or an idle line. The light color and whether constant or flashing indicates if the line is under the user's or another's control, and whether on hold or in use.
REFERENCES:
patent: 4338495 (1982-07-01), Bloch et al.
Comdial--Business Communications Division, Modular Ten-Button Keystrip Voice Expres 41--Installation Instructions IMI 89-005, Jan. 1985. Comdial--Business Communications Division, Modular Six-Button Keystrip Voice Express 41--Installation Instructions IMI 89-002 Aug. 1984. Tele-Tender Key-System Adapter with built in Ringer. TT Systems Corporation, New York, New York.
Schreyer Stafford D.
Telemart Communications Corporation
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