Telephonic communications – Multi-line or key substation system with selective switching... – With special service
Patent
1993-03-29
1995-04-18
Chin, Stephen
Telephonic communications
Multi-line or key substation system with selective switching...
With special service
379231, 379252, 379382, 379399, 3701101, H04M 100, H04M 700, H04M 300, H04J 312
Patent
active
054085241
ABSTRACT:
A system for supervising a telephone connection using over a pulse code modulated carrier network between a first customer's equipment and a second customer's equipment. A first channel unit is located in a channel bank serving the first customer's telephone equipment. A second channel unit is located in a channel bank at a remote central office that is geographically remote from the first customer's equipment. The second channel unit is coupled to the second customer's equipment through a switch at the remote Central Office. The second channel unit includes a means for detecting a reverse battery signal generated by the Central Office when the second customer's telephone goes off-hook, and a means for converting the reverse battery signal into a digital supervisory signal. The second channel unit transmits the digital supervisory signal, preferably using the A and B signalling bits on a pulse code modulated carrier system.
The first channel unit includes an input coupled the PCM carrier and an output coupled to the first customer's telephone equipment. The first channel unit receives the digital supervisory signal and converts the digital supervisory signal to a reverse battery signal, and provides the reverse battery signal to the first customer's telephone equipment.
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patent: 5202919 (1993-04-01), Kiko
"The D4 Digital Channel Bank Family", Nov. 1982, The Bell System Technical Journal, pp. 2605-2625.
Chin Stephen
Loomis Paul
Xel Communications, Inc.
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