Method and system for providing DC power on local telephone lines
US7317793B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 2003 |
| Grant date | Jan 8, 2008 |
| Priority date | — |
| Expiry date | Oct 26, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system for providing DC power on local telephone lines, such as telephone lines in a building or office, for powering devices and circuitry associated with communications over those telephone lines, as well as other functions. Desired voltage and power levels are supplied over local telephone lines by separating the DC power component from the central office or private branch exchange with a DC blocking filter while passing all AC telephony signals. A distinct DC power is then imposed over the telephone line for powering both the telephony service as well as other loads. Conventional telephone off-hook detection is simulated for compatibility with the central office or private branch exchange. The functions required may be integrated, partially or fully within a telephone outlet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.