Patent ID: 6212658
Filing Date: 2001-04-03
Classification: H04B,H04L,Y02D

Abstract:
A method for the correction of a message to be transmitted between a transmitter and a receiver that are distributed on an information transmission line of an installation supplied by the mains system, said line being the site of disturbances liable to affect the transmission of said message, and each device being capable of sending and receiving data elements at a minimum of two transmission rates, wherein said correction method comprises the following steps:a) the sending, by the transmitter, at a first transmission rate, of the message to be transmitted with a request for acknowledgment from the receiver,b) when there is no acknowledgment owing to said disturbances, the sending, by the transmitter, at another transmission rate, of a correction message that is synchronous with the frequency of said mains with a request for obligatory acknowledgment from the receiver, and that contains information elements and a correction algorithm prepared by the sender by comparison between the bits sent and the bits actually transmitted on the line,then, if the correction algorithm indicates no errors in the transmission,c) when there is an acknowledgment of the correction message, the sending, by the transmitter, at said other transmission rate, of the message to be transmitted with a request for acknowledgment from the receiver, ord) when there is no acknowledgment of the correction message, the sending, by the transmitter, with yet another transmission configuration, of the message to be transmitted with a request for acknowledgment from the receiver.