Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Patent
1986-07-07
1991-03-05
Dwyer, James L.
Telephonic communications
Multi-line or key substation system with selective switching...
Line status indication or call alerting
379165, H04M 172
Patent
active
049982753
ABSTRACT:
There is disclosed a multi-line telephone communications system where the need for the hundreds of conductors that are necessary to connect each station to the control and switching equipment is eliminated. This is achieved by replacing the status indicating leads with analog signals impressed upon the voice leads. A specific signal level is assigned to each of the ring, busy, idle and hold functions so that the voice leads carry both the audio signal and status information signal for each line selectable at the telephone station. In response to activation of the telephone keys by the user a cross point switch establishes a voice signal connection between a selected voice line and a talk path associated with the selecting telephone station. A status signal representative of the status of at least the connected voice line and distinct from voice signals is impressed upon the voice line. This status signal is detected and processed for activating the status indicators at each telephone station. Assignment of lines to particular keys of a telephone station is achieved by storing the assignment in a programmable memory. Whenever a line assignment is to be changed from one key to a different key, it is necessary only to enter the change by reprogramming the memory.
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Keith, W. H., "A New Switching System for Right-of-Way Companies", Bell Labs Record, Apr. 1968.
Braunstein Marcel
Hauser Craig
Contel IPC, Inc.
Dwyer James L.
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