It is proposed a method for synchronizing a transmission of applications data frames provided to a sender device, the transmission being done between said sender device and at least one receiver device via a synchronous communications network implementing a clock that defines a network cycle.Upon detection of an event representing a start of an applications data frame, the sender device performs steps of: determining a piece of information on time offset between the instant of detection of the event and a reference instant of a network cycle as well as a piece of information on position of said first network cycle in a sequence of network cycles; transmitting the piece of information on time offset and the piece of information on position, during a first network cycle; processing for transmission, in a bounded lapse of time, a set of applications data starting from the start of the frame; transmitting, the processed applications data starting from a second network cycle subsequent to said first network cycle.