Abstract: A multi-channel sniffer system is provided that includes a reference sniffer comprising a reference clock, secondary sniffers, each having a secondary clock and operable to receive data units from a communication channel, and a synchronization unit connected to the reference sniffer and the secondary sniffers and adapted to switch the reference sniffer and each of the secondary sniffers into a first synchronization mode and to enable a data communication between the reference sniffer and the secondary sniffers. The reference sniffer sends a first delimiting data unit indicating a current reference clock time value to the secondary sniffers when in first synchronization mode. Each of the at least one secondary sniffers is adapted to receive the first delimiting data unit and set a current secondary clock time value of its secondary clock to the current reference clock value.