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Similar standardsYD/T 2375-2019: Technical requirements for high accuracy time synchronization---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/YDT2375-2019COMMUNICATION INDUSTRY STANDARD ICS 33.040.20 M33 Replacing YD/T 2375-2011 Technical requirements for high accuracy time synchronization Issued on. NOVEMBER 11, 2019 Implemented on. JANUARY 01, 2020 Issued by. Ministry of Industry and Information Technology of PRC Table of ContentsForeword... 4 1 Scope... 6 2 Normative references... 6 3 Abbreviations... 7 4 Time synchronization requirements and precision grade division... 8 5 Requirements for high-precision time synchronization networking... 10 6 Requirements for high-precision time synchronization performance indicators... 15 7 High-precision time synchronization transmission technology... 18 8 Requirements for high-precision time synchronization interface... 19 9 Reliability requirements of high-precision time synchronization network... 27 10 Basic requirements for high-precision time synchronization related device... 31 Appendix A (Informative) IRIG/DCLS time coding... 37 Appendix B (Informative) Setting location and quantity of time synchronization device ... 41 Appendix C (Informative) Engineering feasibility requirements... 42 Appendix D (Informative) Estimation of time distribution of time source part in case of satellite timing failure... 44 Appendix E (Informative) Key factors affecting inter-office transmission accuracy. 45 Appendix F (Informative) 1588V2 protocol and BMC algorithm... 481 ScopeThis standard specifies the networking requirements for high-precision time synchronization, the performance index requirements for high-precision time synchronization, the reliability requirements for high-precision time synchronization networks, the basic requirements for equipment related to high-precision time synchronization. This standard applies to high-precision time synchronization networks, based on ground transmission using PTP technology.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard. YD/T 900-1997 Technical requirement for SDH equipment - Clock YD/T 1012-1999 Node clock set of digital synchronization network and its timing feature YD/T 1479-2006 Technical requirements and testing methods of primary reference clock equipment YD/T 2879-2015 (OAM) technical requirements based on the synchronous network operation management and maintenance of a packet network ITU-T G.8262 Timing characteristics of synchronous Ethernet equipment slave clock3 AbbreviationsThe following abbreviations apply to this document. 1PPS. 1 Pulse Per Second4 Time synchronization requirements and precision grade division4.1 Classification of time synchronization precision Air interface synchronization of wireless technologies, such as cdma2000, TD-SCDMA, TD-LTE, LTE-A, as well as applications such as multimedia broadcast/multicast service MBMS, have different requirements for time synchronization and frequency synchronization, as follows. 4.2 Requirements for high-precision time synchronization This standard mainly stipulates the realization of high-precision time transmission and high-precision time synchronization networking, based on PTP technology.5 Requirements for high-precision time synchronization networking5.1 Hierarchical structure of high-precision time synchronization network Considering the fact that the transmission network in China is divided into the inter- provincial backbone transmission network layer, the inner-provincial backbone transmission network layer, the local transmission network layer, THEN, the hierarchical structure of high-precision time synchronization transmission is at most three levels, as shown in Figure 1. The master-slave synchronization method shall be used, for high-precision time 5.2 Composition and basic functions of time synchronization device The level-1 time synchronization device shall be composed of two cesium clocks and two satellite timing receivers, etc., which can be traced to a higher-level domestic time- keeping reference (for example, the National Time Service Center), through a dedicated comparison method. 5.3 Principles of time synchronization networking 5.3.1 General principles of time synchronization networking Under normal circumstances, the time synchronization device shall prefer the signal of the satellite timing receiver. When the satellite signal is unavailable, the low-level time synchronization device shall trace to the high-level time synchronization device, 5.3.2 Relationship between time synchronization network and frequency synchronization network 5.3.3 Principles of reference source setting 5.3.3.1 The principle of setting the timing reference of the level-1 time synchronization The principle of setting the timing reference of level-1 time synchronization is as follows. 5.3.3.2 The principle of setting the timing reference of the level-2 time synchronization The principle of setting the level-2 time synchronization timing reference is as follows.6 Requirements for high-precision time synchronization performance indicators6.1 Overview The working state of the satellite timing receiver will cause changes in the time transmission link of the time synchronization network. 6.2 Allocation of performance indicators of time synchronization network when satellite timing is available 6.3 Allocation of performance indicators of time synchronization network when satellite timing service is unavailable When the satellite timing service is unavailable, the time synchronization network's networking model is as shown in Figure 4.In this networking mode, the time source part may be connected to multiple time synchronization devices, in series.7 High-precision time synchronization transmission technology7.1 High-precision time synchronization technology The realization technology of high-precision time synchronization involves inter-office transmission technology and intra-office distribution technology. 7.2 Inter-office transmission technology Interoffice transmission technology includes the following two categories. 7.3 Intra-office distribution technology Intra-office distribution techniques include the following two categories.8 Requirements for high-precision time synchronization interface8.1 Overview At present, the high-precision time synchronization interfaces mainly include PTP interfaces and 1PPS+ToD interfaces. The PTP interfaces can be used for both inter- office and intra-office time distribution, whilst the 1PPS+ToD interface is only used for intra-office time distribution. 8.2 PTP time interface requirements 8.2.1 Overview PTP time interface requirements include packet encapsulation, packet transmission mode, packet type, packet transmission interval, delay mechanism, One-step/Two-step mode. 8.2.3 PTP message transmission mode For PTP packets using Ethernet II encapsulation format, PTP multicast mode shall be supported; unicast mode can be optionally supported. For UDP over IPv4/IPv6 or other encapsulation formats, PTP multicast mode and unicast mode can be supported. Requirements for PTP multicast and unicast are as shown in IEEE 1588-2008. 8.2.5 PTP packet sending interval The PTP packet sending frequency can be configured. The configuration range of the sending frequency and the default sending frequency are as shown in Table 3. 8.2.6 PTP delay mechanism The PTP interface shall support the E2E delay mechanism; optionally support the P2P delay mechanism. 8.2.7 PTP One-step and Two-step mode It shall support One-step mode; optionally support Two-step mode. 8.3 1PPS+ToD time interface9 Reliability requirements of high-precision time synchronization network9.1 Reliability requirements for time sources The reliability requirements of the time source are as follows. 9.2 Requirements for time synchronization device and time link settings The requirements for time synchronization device and time link settings are as follows. 9.3 Redundant configuration requirements of time synchronization device The redundant configuration requirements of the time synchronization device are as follows. 9.4 Selection requirements for time reference source 9.4.1 Overview The requirements in this chapter are mainly applicable to the selection of the time reference source in the BC mode; the OC mode may use it as a reference; the TC mode is to be studied. 9.4.3 Selection mechanism of time reference source The selection mechanism of time reference source is as follows. YD/T 2375-2019 COMMUNICATION INDUSTRY STANDARD ICS 33.040.20 M33 Replacing YD/T 2375-2011 Technical requirements for high accuracy time synchronization Issued on. NOVEMBER 11, 2019 Implemented on. JANUARY 01, 2020 Issued by. Ministry of Industry and Information Technology of PRCTable of ContentsForeword... 4 1 Scope... 6 2 Normative references... 6 3 Abbreviations... 7 4 Time synchronization requirements and precision grade division... 8 5 Requirements for high-precision time synchronization networking... 10 6 Requirements for high-precision time synchronization performance indicators... 15 7 High-precision time synchronization transmission technology... 18 8 Requirements for high-precision time synchronization interface... 19 9 Reliability requirements of high-precision time synchronization network... 27 10 Basic requirements for high-precision time synchronization related device... 31 Appendix A (Informative) IRIG/DCLS time coding... 37 Appendix B (Informative) Setting location and quantity of time synchronization device ... 41 Appendix C (Informative) Engineering feasibility requirements... 42 Appendix D (Informative) Estimation of time distribution of time source part in case of satellite timing failure... 44 Appendix E (Informative) Key factors affecting inter-office transmission accuracy. 45 Appendix F (Informative) 1588V2 protocol and BMC algorithm... 481 ScopeThis standard specifies the networking requirements for high-precision time synchronization, the performance index requirements for high-precision time synchronization, the reliability requirements for high-precision time synchronization networks, the basic requirements for equipment related to high-precision time synchronization. This standard applies to high-precision time synchronization networks, based on ground transmission using PTP technology.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard. YD/T 900-1997 Technical requirement for SDH equipment - Clock YD/T 1012-1999 Node clock set of digital synchronization network and its timing feature YD/T 1479-2006 Technical requirements and testing methods of primary reference clock equipment YD/T 2879-2015 (OAM) technical requirements based on the synchronous network operation management and maintenance of a packet network ITU-T G.8262 Timing characteristics of synchronous Ethernet equipment slave clock3 AbbreviationsThe following abbreviations apply to this document. 1PPS. 1 Pulse Per Second4 Time synchronization requirements and precision grade division4.1 Classification of time synchronization precision Air interface synchronization of wireless technologies, such as cdma2000, TD-SCDMA, TD-LTE, LTE-A, as well as applications such as multimedia broadcast/multicast service MBMS, have different requirements for time synchronization and frequency synchronization, as follows. 4.2 Requirements for high-precision time synchronization This standard mainly stipulates the realization of high-precision time transmission and high-precision time synchronization networking, based on PTP technology.5 Requirements for high-precision time synchronization networking5.1 Hierarchical structure of high-precision time synchronization network Considering the fact that the transmission network in China is divided into the inter- provincial backbone transmission network layer, the inner-provincial backbone transmission network layer, the local transmission network layer, THEN, the hierarchical structure of high-precision time synchronization transmission is at most three levels, as shown in Figure 1. The master-slave synchronization method shall be used, for high-precision time 5.2 Composition and basic functions of time synchronization device The level-1 time synchronization device shall be composed of two cesium clocks and two satellite timing receivers, etc., which can be traced to a higher-level domestic time- keeping reference (for example, the National Time Service Center), through a dedicated comparison method. 5.3 Principles of time synchronization networking 5.3.1 General principles of time synchronization networking Under normal circumstances, the time synchronization device shall prefer the signal of the satellite timing receiver. When the satellite signal is unavailable, the low-level time synchronization device shall trace to the high-level time synchronization device, 5.3.2 Relationship between time synchronization network and frequency synchronization network 5.3.3 Principles of reference source setting 5.3.3.1 The principle of setting the timing reference of the level-1 time synchronization The principle of setting the timing reference of level-1 time synchronization is as follows. 5.3.3.2 The principle of setting the timing reference of the level-2 time synchronization The principle of setting the level-2 time synchronization timing reference is as follows.6 Requirements for high-precision time synchronization performance indicators6.1 Overview The working state of the satellite timing receiver will cause changes in the time transmission link of the time synchronization network. 6.2 Allocation of performance indicators of time synchronization network when satellite timing is available 6.3 Allocation of performance indicators of time synchronization network when satellite timing service is unavailable When the satellite timing service is unavailable, the time synchronization network's networking model is as shown in Figure 4.In this networking mode, the time source part may be connected to multiple time synchronization devices, in series.7 High-precision time synchronization transmission technology7.1 High-precision time synchronization technology The realization technology of high-precision time synchronization involves inter-office transmission technology and intra-office distribution technology. 7.2 Inter-office transmission technology Interoffice transmission technology includes the following two categories. 7.3 Intra-office distribution technology Intra-office distribution techniques include the following two categories.8 Requirements for high-precision time synchronization interface8.1 Overview At present, the high-precision time synchronization interfaces mainly include PTP interfaces and 1PPS+ToD interfaces. The PTP interfaces can be used for both inter- office and intra-office time distribution, whilst the 1PPS+ToD interface is only used for intra-office time distribution. 8.2 PTP time interface requirements 8.2.1 Overview PTP time interface requirements include packet encapsulation, packet transmission mode, packet type, packet transmission interval, delay mechanism, One-step/Two-step mode. 8.2.3 PTP message transmission mode For PTP packets using Ethernet II encapsulation format, PTP multicast mode shall be supported; unicast mode can be optionally supported. For UDP over IPv4/IPv6 or other encapsulation formats, PTP multicast mode and unicast mode can be supported. Requirements for PTP multicast and unicast are as shown in IEEE 1588-2008. 8.2.5 PTP packet sending interval The PTP packet sending frequency can be configured. The configuration range of the sending frequency and the default sending frequency are as shown in Table 3. 8.2.6 PTP delay mechanism The PTP interface shall support the E2E delay mechanism; optionally support the P2P delay mechanism. 8.2.7 PTP One-step and Two-step mode It shall support One-step mode; optionally support Two-step mode. 8.3 1PPS+ToD time interface9 Reliability requirements of high-precision time synchronization network9.1 Reliability requirements for time sources The reliability requirements of the time source are as follows. 9.2 Requirements for time synchronization device and time link settings The requirements for time synchronization device and time link settings are as follows. 9.3 Redundant configuration requirements of time synchronization device The redundant configuration requirements of the time synchronization device are as follows. 9.4 Selection requirements for time reference source 9.4.1 Overview The requirements in this chapter are mainly applicable to the selection of the time reference source in the BC mode; the OC mode may use it as a reference; the TC mode is to be studied. 9.4.3 Selection mechanism of time reference source The selection mechanism of time reference source is as follows. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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