Subscriber loop feed apparatus
US4197431A · kind A · utility
39Cited by
7References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1978 |
| Grant date | Apr 8, 1980 |
| Priority date | — |
| Expiry date | Oct 2, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Telephone loop feed apparatus in which a hybrid couples audio signals to and from the subscriber loop and presents a high impedance to the loop relative to the loop impedance. DC power is coupled to the loop by matched resistors which determine the loop feed matching resistance. DC power is blocked from the hybrid to avoid saturation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.