YD/T 2375-2019 PDF English
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YD/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/YDT2375-2019
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 PRC
Table of Contents
Foreword... 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... 48
1 Scope
This 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 references
The 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
clock
3 Abbreviations
The following abbreviations apply to this document.
1PPS. 1 Pulse Per Second
4 Time synchronization requirements and precision grade division
4.1 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 networking
5.1 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 indicators
6.1 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 technology
7.1 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 interface
8.1 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 interface
9 Reliability requirements of high-precision time synchronization network
9.1 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 PRC
Table of Contents
Foreword... 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... 48
1 Scope
This 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 references
The 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
clock
3 Abbreviations
The following abbreviations apply to this document.
1PPS. 1 Pulse Per Second
4 Time synchronization requirements and precision grade division
4.1 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 networking
5.1 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 indicators
6.1 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 technology
7.1 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 interface
8.1 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 interface
9 Reliability requirements of high-precision time synchronization network
9.1 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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