本标准定义了一种网络协议，即精确时间协议（PTP），能够准确、精确地同步网络分布式系统中设备的实时时钟。该协议适用于设备通过网络（包括以太网）进行通信的系统。该标准允许多播通信、单播通信或两者兼有。该标准规定了将协议映射到特定网络实现的要求，并定义了此类映射，包括用户数据报协议（UDP）/互联网协议（IP版本4和6）和层- 2.IEd802.3Ethernet。Cross References:IEC 61158-3-2:2007IEC 61158-4-2:2007IEC 61158-5-2:2007IEC 61158-5-10:2007IEC 61158-6-2:2007IEC 61158-6-10:2007IEC 61784-1:2007IEC 61784-2:2007IEC 62026-3:2008IEEE Std 802IEEE Std 802.1ABTMIEEE Std 802.1QTM-2005IEEE Std 802.3TM-2005ISO/IEC 10646:2003IETF 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）ISOR65240（1998?TEFAc2783（2006）IYISO/ICEDE 2007ISO/IEC 9945:2003ISO 8601:2004ITU-T建议G.810购买本文件时提供的所有当前修订版均包含在购买本文件中。

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 61158-3-2:2007IEC 61158-4-2:2007IEC 61158-5-2:2007IEC 61158-5-10:2007IEC 61158-6-2:2007IEC 61158-6-10:2007IEC 61784-1:2007IEC 61784-2:2007IEC 62026-3:2008IEEE Std 802IEEE Std 802.1ABTMIEEE Std 802.1QTM-2005IEEE Std 802.3TM-2005ISO/IEC 10646:2003IETF 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 99:2007ISO/IEC 9945:2003ISO 8601:2004ITU-T Recommendation G.810All current amendments available at time of purchase are included with the purchase of this document.