The present invention relates to a method of synchronisation between
communication networks exchanging information by frame of informations,
each communication network having clock and the number of clock pulses is
monitored by a counter. The synchronisation is made by reading
information representing the counted clock pulses of the clock of the
first network at the appearance of a reference event, inserting at least
said information or calculated information on the basis of said
information into the frame of information as the synchronisation
information, transferring said frame of information from the first to the
second network, reading information representing the number of counted
clock pulse of the clock of the second network at the appearance of
reference event, reading synchronisation information inserted in received
frame of information from the first network, calculating a difference
between information and synchronising the second network.