FIELD: electrical engineering.
SUBSTANCE: for single-stage transfer of a clock signal as per IEEE 1588 standard symmetrical and asymmetrical protection circuit. Clock signals of crucial or widely available devices in industrial automation systems connected to communication network are synchronised by means of synchronization message transfer by master clock generator, in particular one message of single-stage synchronisation as per IEEE 1588 standard with time stamp and receipt and evaluation of this message by slave clock generator. Before beginning of the planned time moment tsend synchronising component or module of the master clock generator prepares or shapes synchronisation message that includes time stamp of the transfer and protects is before moment of transfer. Protection of synchronisation message is carries out by appropriate cryptographic means that allow at least identification of the time stamp in the slave clock generator, for example, by method of computation and sign assignment for check sum or hashing of the synchronisation message. Transfer of the protected synchronisation message is carried out at the planned moment of time.
EFFECT: improved accuracy of clock synchronisation.
8 cl, 4 dwg
