本标准涉及中央办公室内部环境中定时信号发生器（TSG）和网元（NE）之间的互连。本标准的主要重点是以太网信号的物理层连接，包括从办公室TSG向网元传输定时参考的连接、布线和屏蔽要求。保护（如闪电）不在本文件范围内。使以太网信号适合计时的更高层协议、格式和要求不在本文件范围内，但在附录中提供，以供参考。本标准并未淘汰基于用于DS1和复合时钟（CC）办公室内定时分布的传统双绞线布线的定时参考分布。

This standard addresses the interconnection between the Timing Signal Generator (TSG) and Network Elements (NE) in an intra-Central-Office environment. The principal focus of this standard is the physical layer connectivity for Ethernet signals, including the connectorization, cabling, and shielding requirements for delivering a timing reference from the Office TSG to the NE. Protection (e.g., lightning) is out of the scope of this document. The higher layer protocols, formats, and requirements that make the Ethernet signal suitable for timing are not in the scope of this document, but are provided in an Annex for information. This standard does not obsolete timing reference distribution based on traditional twisted-pair cabling used for DS1 and composite-clock (CC) intra-office timing distribution.