Continuous transmission mode is a telecommunications mode where a good part of the communication transmission links are of the continuous-mode type, in which the signal is present at all times. In more quantitative terms, continuous transmission mode takes place: * at constant bit rate, * when the communication channel is active for times much longer than both: * the time needed to set up the channel itself, and/or * the time needed to transmit any file or record or any other sequence of information bearing bits.