Trunk interface circuit having function of battery feed to central office
US6144737A · kind A · utility
22Cited by
10References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1998 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Mar 11, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/003
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone-system interface circuit connected to a central office via a tip line and a ring line includes a battery having a first terminal and a second terminal. A first current control circuit is connected between the tip line and the first terminal of the battery. A second current control circuit is connected between the ring line and the second terminal of the battery. The first current control circuit and the second current control circuit are equal in structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.