Abstract: A novel mechanism for detecting the presence of powered devices over a network. A unique, infinite pseudo-random sequence of pulses are generated and transmitted over the network to the link partner attached to the other end of the cable. At each time unit, the PSE decides whether or not to transmit a pulse at that time. Thus, the pulses generated have pseudo-random inter-pulse delays between them. In addition, each pulse is pseudo-randomly selected to have either positive or negative polarity. If the link partner is a powered device it will be in loopback mode and the transmitted pulses will be looped back to the transmitter (i.e. the PSE). The PSE, at each time unit regardless of whether or not a pulse was transmitted, opens a search window in which it listens to the RX line for the appropriate expected behavior. If a pulse was transmitted, the PSE expects to see a pulse looped back. Similarly, if no pulse was transmitted, the PSE does not expect to receive a signal during the search window.

Abstract: A novel mechanism for detecting the presence of powered devices over a network. A unique, infinite pseudo-random sequence of pulses are generated and transmitted over the network to the link partner attached to the other end of the cable. At each time unit, the PSE decides whether or not to transmit a pulse at that time. Thus, the pulses generated have pseudo-random inter-pulse delays between them. In addition, each pulse is pseudo-randomly selected to have either positive or negative polarity. If the link partner is a powered device it will be in loopback mode and the transmitted pulses will be looped back to the transmitter (i.e. the PSE). The PSE, at each time unit regardless of whether or not a pulse was transmitted, opens a search window in which it listens to the RX line for the appropriate expected behavior. If a pulse was transmitted, the PSE expects to see a pulse looped back. Similarly, if no pulse was transmitted, the PSE does not expect to receive a signal during the search window.

Abstract: The method relates to the reconfiguration of meshed networks for telecommunications systems with time-division multiplexing, i.e. to a modification of the routing of the signals so that they can be sent with the utmost efficiency despite breaks in the network. In a network comprising nodes distributed in a loop and, possibly, lateral nodes, when breaks cause the loop to be split into sections, the method consists in using standby lines, if any, to connect the lines to one another and to select these standby lines to join the nodes into one network reconfigured by a path without redundancies, i.e. by a path in which the lines are crossed once and only once in each direction. Application to networks for telecommunications systems with time-division multiplexing.

Abstract: A method of information transmission over a radio channel useful in the field of mobile radio, in which information is sent by the mobile stations broken up into fragments protected by an error detection and correction code. The information is received by one or various fixed receive stations RC.sub.1, . . . , RC.sub.n transmitting the received fragments to a central station CS after having specified them (rank, quality), which central station restores the information signals by performing the logic addition of all received correct fragments, eliminating the fragments that have already been received and requesting a repetition of the fragments that have not been received.