Sequential data transmission system with resynchronization

DETAILED DESCRIPTION This invention provides a data transmission system comprising a continuous path for the transmission of data in which path are interposed a plurality of interface means each for transferring data from the path to an associated device, and/or from an associated device to the path, each interface means having means for deriving a clock signal from data received from the path and means responsive to that clock signal and capable of outputting onto the path data received from it, and characterised in that there is provided a source for a clock signal and means at a plurality of points on the path for resynchronising the data being transmitted on the path at each of those points to clock signals from the said source.
The synchronising means resynchronises the data to a common standard, and hence prevent timing variations from accumulating along the whole length of the network.
The invention also provides a coupling device suitable for use as the coupling means in a system according to the invention.