Subscriber circuit link interface for an automatic telephone exchange
US4752952A · kind A · utility
1Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 20, 1985 |
| Grant date | Jun 21, 1988 |
| Priority date | — |
| Expiry date | May 20, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The interface of the invention comprises a power supply circuit (16) which is a symmetrical amplifier circuit, and a hybrid circuit (29) controlling the power supply circuit in DC and in AC. The hybrid includes a phase shifter circuit (44, 45) simulating long lines. Application: private telephony.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.