The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 09, 1992
Filed:
Jan. 29, 1990
Gerard Demarais, Soisy-Sous-Montmorency, FR;
Faiveley Transport, Saint-Ouen Cedex, FR;
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 transmitted.