ITU-T G.8263-2012
(预发布)基于分组设备时钟(PEC)的时间特性

Timing characteristics of packet-based equipment clocks (Study Group 15)

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标准号

ITU-T G.8263-2012

发布日期

2012年02月01日

实施日期

废止日期

无

中国标准分类号

M10

发布单位

IX-ITU

引用标准

ITU-T G.810-1996 ITU-T G.811-1997 ITU-T G.823-2000 ITU-T G.8263/Y.1363-2012 ITU-T G.824-2000 ITU-T G.8261-2008 ITU-T G.8265-2010 ITU-T G.8265.1-2010 ITU-T G.8261.1-2012 ITU-T G.8260-2012

适用范围

This Recommendation outlines minimum requirements for the timing functions of the Packet Slave Clocks as defined in G.8265. It supports frequency synchronization distribution when using packet based methods. This Recommendation allows for proper network operation when a Packet Slave Clock is timed from a Packet Master Clock as defined in G.8265. This Recommendation focuses on mobile applications, and in particular on the delivery of frequency synchronization for end applications such as mobile base stations. It supports the architecture defined in Recommendation G.8265. Other applications are for further study. This Recommendation focuses on two different deployment cases for the Packet Slave Clock: Packet Slave Clock embedded in a device co-located with the end application, as shown after the connection C1 in Figure 3 of Recommendation G.8261.1 Packet Slave Clock embedded within the end application, as shown after the connection C2 in Figure 3 of Recommendation G.8261.1. This second case is for further study for the first version of this Recommendation other deployment cases for the Packet Slave Clock are for further study. This Recommendation focuses on the types of networks corresponding to the HRM-1 and HRM-2 as defined in G.8261.1. Note: the HRM-2 type of network is for further study for the first version of this Recommendation. Other types of networks are out of the scope of this Recommendation. This Recommendation defines the minimum requirements for the Packet Slave Clocks. These requirements apply under the normal environmental conditions specified for the equipment. This Recommendation includes clock accuracy, Packet Delay Variation noise tolerance, holdover performance and noise generation. The start-up conditions (e.g. variable filtering bandwidth at start-up, stabilization period, etc.) are for further study.

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