Abstract: According to the invention, a data transmission system is provided in which data streams corresponding to file transfer applications are separated from those that correspond to transaction traffic. Each node of the system has a monitoring function for monitoring a congestion of interconnection links to measure a load caused by local file transfer applications. A switch switches at least one communication onto the switched network when said load exceeds a predetermined level.

Abstract: An adaptive routing protocol for a data communication system that operates in the connection mode. Therefore, the nodes have a function of detecting their neighboring nodes, which permits establishing sessions with their neighbors without previously knowing them, so as to transmit to them recognition messages which indicate their own identifier. Each node additionally has a double identifier of which one identifier is formed by the serial number of the node, so that the serial number can be detected in the system before any configuration and this, more particularly, by a terminal dedicated to managing the system entrusted with the remote configuration of the nodes.