Telephone extension system utilizing power line carrier signals
US4479033A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1982 |
| Grant date | Oct 23, 1984 |
| Priority date | — |
| Expiry date | Mar 29, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2203/5454
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A power line telephone extension system for carrying electrical signals between a subscriber's telephone line of a conventional telephone communication system and the subscriber's remote transmit-receiver device, (such as a conventional extension telephone), over the AC electric power wires available to the subscriber which includes: master linking circuits for processing signals between the subscriber's telephone line and the AC power wires; extension linking circuits for processing signals between the AC power wires and the subscriber's remote transmit-receive device, such as a conventional extension telephone; and a directional coupler circuit electrically coupling the remote transmit-receive device and the telephone line. The extension system is quite suitable for use with the presently available, well known, conventional extension telephone that plugs in by the plug (modular or 4 prong) provided therewith, to the directional coupler. Thus, the extension phone can then be used along with the extension linking circuits at any location at the subscriber's premises where there is access to the AC power wires.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.