Abstract: The invention concerns the transmission of data packets in multicast mode, in which method the packets are sent from a sending end of a physical transmission medium and received by terminals at a receiving end of said medium. It finds a typical application in networks whose terminals cannot listen to each other, which is the case in satellite networks, for example, whereas management implies sending a query message to the terminals in order to determine the presence of an active group of terminals as a function of the reception of a response message from a terminal of said group. A signal is then sent to the terminals from the sending end, preferably the returned response, to indicate reception of a response message from a terminal of the group of terminals, so that terminals that have not sent a response message can act accordingly, in particular by interrupting their own process for sending a response.

Abstract: The invention concerns the transmission of data packets in multicast mode, in which method the packets are sent from a sending end of a physical transmission medium and received by terminals at a receiving end of said medium. It finds a typical application in networks whose terminals cannot listen to each other, which is the case in satellite networks, for example, whereas management implies sending a query message to the terminals in order to determine the presence of an active group of terminals as a function of the reception of a response message from a terminal of said group. A signal is then sent to the terminals from the sending end, preferably the returned response, to indicate reception of a response message from a terminal of the group of terminals, so that terminals that have not sent a response message can act accordingly, in particular by interrupting their own process for sending a response.

Abstract: A device for linearizing transmitter amplifiers for transmitter equipment including a plurality of transmitters (11, 12, . . . 1n), each including a transmitter amplifier (4) and not totally decoupled from each other, said device including means for controlling the transmission of linearization signals relative to each amplifier and means (6) for analyzing the corresponding amplified linearization signals to determine the non-linearities of said amplifier and applying to wanted signals a pre-correction (5) to compensate said non-linearities, said device being essentially characterized in that it includes central control means (8, 8′, 10-20) for commanding the transmission of linearization signals relating to different transmitter amplifiers at different times.