Communication system (S1) for an aircraft (a), comprising: a first data concentrator (K1a) a first plurality of communicating devices (Dil, Di2, Di3... DiX, DiY, DiZ), each of these communicating devices being adapted to send data to the first concentrator (K1a) by wireless transmission, the first concentrator being adapted to process data sent by said communicating devices and received by this first concentrator, characterised in that the first concentrator is arranged to broadcast, by wireless transmission, at least one parameterisation signal (S0) of at least one operating cycle of the communication system (S1) and each given communicating device of the first plurality of communicating devices is arranged to send to the first concentrator (K1a), in response to this at least one parameterisation signal (S0) of the cycle, an identification signal (Id1 or Id2) unique to this given communicating device (Di1 or Di2), the first concentrator (K1a) being arranged to broadcast one or more assignment signals (J1 or J2) to assign a plurality of time windows (F1 or F2) separate from one another, valid for the operating cycle, each time window being assigned to only one of the communicating devices, the first concentrator (K1a) of which has received a unique identification signal and being associated with at least one communication channel (C1, C2, C3 or C4) of a plurality of communication channels of the wireless transmission, each given communicating device being arranged to transmit data (R1, R2, R3... RX, RY, RZ) intended for the first concentrator (K1a) via said at least one communication channel associated with the time window assigned to this given communicating device only during this time window. a first data concentrator (K1a) a first plurality of communicating devices (Dil, Di2, Di3... DiX, DiY, DiZ), each of these communicating devices being adapted to send data to the first concentrator (K1a) by wireless transmission, the first concentrator being adapted to process data sent by said communicating devices and received by this first concentrator, characterised in that the first concentrator is arranged to broadcast, by wireless transmission, at least one parameterisation signal (S0) of at least one operating cycle of the communication system (S1) and each given communicating device of the first plurality of communicating devices is arranged to send to the first concentrator (K1a), in response to this at least one parameterisation signal (S0) of the cycle, an identification signal (Id1 or Id2) unique to this given communicating device (Di1 or Di2), the first concentrator (K1a) being arranged to broadcast one or more assignment signals (J1 or J2) to assign a plurality of time windows (F1 or F2) separate from one another, valid for the operating cycle, each time window being assigned to only one of the communicating devices, the first concentrator (K1a) of which has received a unique identification signal and being associated with at least one communication channel (C1, C2, C3 or C4) of a plurality of communication channels of the wireless transmission, each given communicating device being arranged to transmit data (R1, R2, R3... RX, RY, RZ) intended for the first concentrator (K1a) via said at least one communication channel associated with the time window assigned to this given communicating device only during this time window. <EOS>