Control system for telephone switching system
US4366350A · kind A · utility
15Cited by
1References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1980 |
| Grant date | Dec 28, 1982 |
| Priority date | — |
| Expiry date | Mar 10, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/1332
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephony system with automatic test calling. Test access circuitry connected to port circuits enables the test call circuit to select actual ports for a test call and monitor the test call signals. Test calls are initiated either on a periodic basis on in resonse to a fault condition. Any portion of the telephony system therefore can be used in a test call.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.