Self-diagnosis of loop start and ground start trunk interfaces
US5003573A · kind A · utility
90Cited by
1References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1990 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Apr 12, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M7/0096
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for sectionalization and self-diagnosis of loop start and ground start trunk interfaces without intervention from host telephone company equipment. The inventive method entails the use of an isolation relay in the trunk circuit to isolate the trunk circuit electrically from the physical medium and to apply various signals to portions of the isolated trunk circuit to carry out specific self-diagnostic tests.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.