Power line carrier communication system
US4885563A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1988 |
| Grant date | Dec 5, 1989 |
| Priority date | — |
| Expiry date | May 3, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2203/5483
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A power line carrier communication system having a carrier current transceiver (CCT) interface with an electrical power line via a buffer which automatically provides a low output drive impedance while transmitting, and a high receiving impedance when receiving, all with solid state circuitry. The length of signal transmission by the CCT is monitored and automatically prevented from continuously loading the communication network in the event of a malfunction which causes a signal transmission to exceed normal maximum transmission time. Prevention of continuous loading of the communication circuit is accomplished without adverse affect on the CCT via a crowbar circuit connected to the buffer circuitry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.