Abstract: A device for ensuring in an intermediate station the transfer and the branch connection of at least one channel of plesiochronous numerical data multiplexed in accordance with a specific field of the transmission system, the intermediate station comprising a general emitting element provided with a clock and a general receiving element provided with a clock, said device comprising means for synchronizing in frequency and phase the clock of the general emitting element with the clock of the general receiving element, and an emitting path card which comprises a mixer whose first input terminal is fed by the signal of the information and justification bits and whose second input terminal is fed by the justification indication signal and whose output terminal, which is the output terminal of the path card, delivers a signal in which the first half of each bit is characteristic of the information and justification signal and the second half of the same bits is characteristic of the justification indication signal.