This standard defines a network protocol, the Precision Time Protocol (PTP), enabling accurate and precise synchronization of the real-time clocks of devices in networked distributed systems. The protocol is applicable to systems where devices communicate via networks, including Ethernet. The standard allows multicast communication, unicast communication or both. The standard specifies requirements for mapping the protocol to specific network implementations and defines such mappings, including User Datagram Protocol (UDP)/Internet Protocol (IP versions 4 and 6), and layer-2 IEEE 802.3 Ethernet.

Cross References:
IEC 61158-3-2:2007
IEC 61158-4-2:2007
IEC 61158-5-2:2007
IEC 61158-5-10:2007
IEC 61158-6-2:2007 
IEC 61158-6-10:2007
IEC 61784-1:2007
IEC 61784-2:2007
IEC 62026-3:2008
IEEE Std 802
IEEE Std 802.1ABTM
IEEE Std 802.1QTM-2005
IEEE Std 802.3TM-2005
ISO/IEC 10646:2003
IETF RFC 768 (1980) 
IETF RFC 791 (1981)
IETF RFC 1305 (1992)
IETF RFC 1589 (1994)
IETF RFC 1624 (1994)
IETF RFC 2104 (1997)
IETF RFC 2404 (1998)
IETF RFC 2460 (1998) 
IETF RFC 2783 (2000)
IETF RFC 4291 (2006)
ISO/IEC GUIDE 99:2007
ISO/IEC 9945:2003
ISO 8601:2004
ITU-T Recommendation G.810


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