Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Patent
1994-05-24
1995-04-18
Chin, Stephen
Telephonic communications
Multi-line or key substation system with selective switching...
Detail of hold circuitry
379156, 379161, 379164, 379165, H04M 100
Patent
active
054085250
ABSTRACT:
A diverter interfaces first and second telecommunication lines from first and second telecommunication sources, respectively, with a third line coupled to a station set. The diverter includes separate line and set monitors and a control unit. The line and set monitors monitor and detect predetermined selective signals such as (a) ringing signals propagating on the first and second lines, and (b) line access codes, flash hook, and line change requests signals generated by the station set. In response to the detected predetermined selective signals, the line and set monitors generate first, second, and third output control signals representative of the predetermined selective signals on the first, second, and third lines, respectively, to the control unit. The control unit, which is responsive to output signals from the line and set monitors, selectively couples a predetermined one of the first and second lines directly to the third line without interfering with the predetermined selective signals and states present on the first, second, and third lines. The control unit also generates predetermined output control signals to the line and set monitors for generating output signals such as call waiting signals for transmission to the station set on the third line. The diverter is powered from the first and second lines, and its actions remain invisible to and do not affect the first and second telecommunication sources and the station set.
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Chin Stephen
General Instrument Corporation of Delaware
Ostroff Irwin
Pfeifle Erwin W.
Shankar Vijay
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