Method for the transmission of data or commands and device for carrying out said method
US5121410A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 29, 1990 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Jan 29, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/1461
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The method for the transmission of data or commands, in alternating duplex mode between a first port (2) connected to a first of transmission lines, and a second port (3) connected to a second pair of transmission lines, comprises: a step (A) of detection and processing of data at the input of either of the said ports, then designated as the input port, the other port being designated as the output port, followed by a step (B) of blocking any transmission of possible signals coming from the output port towards the input port, a step (C) of transmission of the said data from the input port to the output port when data are detected at the input of the input port, and in the opposite case followed by a step (D) of blocking the transmission of all possible signals from the input port to the output port, leding to step (A) again. The data presented to any of the said ports are in the form of an amplitude modulation of an alternating carrier signal having a predetermined carrier frequency, and the step (A) of detection and processing comprises a step of identification of the predetermined carrier frequency and a step of extraction of a useful signal representative of the said data to be …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.