A method for synchronizing data transmitted between at least one transmit terminal (TE) and a receive terminal (TR) via a transmission channel (CD) with unmanaged latency, comprising the steps:(a) in said or in each transmit terminal, generating at least one synchronization signal (SSYNC) having a known temporal relationship with the time of transmission of at least one data packet (SEEG) to be synchronized(b) transmitting said or each data packet to be synchronized on said transmission channel with unmanaged latency, and said or each synchronization signal on an auxiliary transmission channel (CS) with managed latency(c) in said receive terminal, receiving said or each data packet to be synchronized and said or each synchronization signal and(d) synchronizing said or each data packet received by said receive terminal by means of said synchronization signal.Data acquisition device for carrying out such a method.