Pre-cutover verification of switching system subscriber lines served via digital carrier facilities
US4653043A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1985 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | Jul 1, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/244
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A test arrangement and method for use prior to the replacement of a first switching system serving a plurality of subscriber lines via a digital carrier facility and via a remote terminal, by a second switching system, where facility interface equipment of the second system is bridged directly onto the digital facility to allow monitoring of digital signatures transmitted from the remote terminal during the continued, uninterrupted operation of the first system. A pair gain test controller of the first system is advantageously used by the second system to control the generation of such digital signatures to verify the consistency of the translation databases of the two systems in associating directory numbers with subscriber lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.