Answer supervision over pulse code modulated carrier system and method therefore
US5408524A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1993 |
| Grant date | Apr 18, 1995 |
| Priority date | — |
| Expiry date | Mar 29, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M17/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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 si…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.