Alarm and test system for a digital added main line
US5111497A · kind A · utility
169Cited by
12References
71Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1990 |
| Grant date | May 5, 1992 |
| Priority date | — |
| Expiry date | Sep 17, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13335
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A test system directed to apparatus for transmitting and receiving multiple telephone transmission signals over a single twisted pair. The system converts an analog signal from a local switching station to an 80 ksymbols/sec signal for transmission over a twisted pair by a line card. A remote terminal converts the 80 ksymbols/sec signal back into a conventional analog signal for use in conventional telephone, facsimile or other related equipment. The test equipment separately tests the entire system, the line card portion of the system, the remote terminal portion of the system, and the twisted pair.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.