Patent ID: 6396806
Filing Date: 2002-05-28
Classification: G06F,H04B,H04L

Abstract:
A transmission line duplexing processing method comprising the steps of:installing a duplex transmission line between a plurality of terminal devices, said duplex transmission line being duplicated by first and second transmission lines; making it possible to send and receive data of a stream unit train between said terminal devices by using a TCP protocol; sending the data of said stream unit train simultaneously to each of duplicated said first and second transmission lines; receiving data, and handling only data which is included in the data sent at said sending step and which has arrived earlier, as received data; detecting an abnormality caused on either of said first and second transmission lines; and responding to detection of occurrence of the abnormality on the transmission line conducted at said abnormality detecting step, to close the transmission line having the abnormality and conduct sending and receiving by using a remaining normal transmission line.