Methods of synchronisationin communication networks

To synchronize the communication equipment it is neces- sary to build frequency-time support systems. Time syn- chronisation means simultaneous synchronisation of master and slave devices by frequency, phase and date. In existing networks the synchronisation method based on NTP/SNTP, RTR protocols and time signal distribution devices is wide- ly used. However, there are many factors affecting the time transmission accuracy during synchronisation from special- ised equipment installed together with synchronised com- munication equipment. Thispaper considers the relevance of application of integrated small-size time servers synchro- nised from GNSS, their advantages and disadvantages in comparison with classical methods of synchronisation.