IEEE 1588 PTP is to exchange messages consecutively to determine the offset between master and slave and also to find out message transit delay through the network. . This is to synchronize all the Real Time Clocks in the distributed network with sub-microsecond accuracy. The 1588 Master cyclically transmits sync-messages and follow-up messages for the purpose of offset correction. The master and slave also exchange delay-request and delay-reply messages for the purpose of delay measurement. PTP is based on IP multicast communication and is not restricted to Ethernet, but can be used on any system that supports multicasting. In the current implementation, Ethernet Communication is used.