Distributed network synchronization system.

摘要

The digital transmission system comprises a central station (11) and a plurality of remote stations (12) each station including means for transmitting and receiving digital data in a sequence of frames, and transmission means arranged between said central station and each of said remote stations and causing a variable inherent delay therebetween dependent upon the location of the respective remote station. The central station includes means for transmitting a first signal to each of said remote stations chosen in turn and for receiving a signal therefrom dependent on the first signal. The central station also includes means for producing from said first signal and said received signal a delay signal representative of the inherent delay relative to the chosen remote station and for transmitting said delay signal to remote station. Each remote station includes means for receiving and storing said delay signal and means for changing the time of transmission of the transmission means of said remote station in dependence upon said stored delay.