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Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Timing and synchronization for time-sensitive applications in bridged local area networks
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GB/T 42404-2023
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Basic data | Standard ID | GB/T 42404-2023 (GB/T42404-2023) | | Description (Translated English) | Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Timing and synchronization for time-sensitive applications in bridged local area networks | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | L79 | | Classification of International Standard | 35.110 | | Word Count Estimation | 199,148 | | Date of Issue | 2023-03-17 | | Date of Implementation | 2023-10-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 42404-2023: Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Timing and synchronization for time-sensitive applications in bridged local area networks
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ICS35:110
CCSL79
National Standards of People's Republic of China
Telecommunication and information exchange between information technology systems
LAN and MAN bridging LAN time
Timing and synchronization for sensitive applications
areanetworks, MOD)
2023-03-17 release 2023-10-01 implementation
State Administration for Market Regulation
Released by the National Standardization Management Committee
table of contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 2
4 Abbreviations4
5 Compliance5
5:1 Overview 5
5:2 Protocol Implementation Conformity Statement (PICS) 5
5:3 Time-aware bridges and end stations 5
5:4 MAC-specific timing and synchronization methods for full-duplex links 6
5:5 MAC specific timing and synchronization methods 6
5:6 MAC-specific timing and synchronization methods for EPON 6
5:7 Realization of Transmission Frequency Synchronization in PON System 6
5:8 Realization method of transmission time synchronization in PON system 7
5:9 MAC-specific timing and synchronization methods for Coordinated Shared Network (CSN) 7
6 Agreement 7
6:1 Overview 7
6:2 Service Specification Definition and Notation 7
6:3 Data types and online formats 7
7 Time Synchronization Models for Bridged LANs 10
7:1 Overview 10
7:2 Time-Aware Bridged LAN Architecture 11
7:3 Time Synchronization 12
7:4 Time-aware system architecture 14
7:5 Difference between gPTP and PTP 16
8 Basic Concepts 16
8:1 gPTP domain 16
8:2 Time scale 17
8:3 Asymmetric Communication Paths 17
8:4 Message 18
8:5 Port 20
8:6 Properties of time-aware systems 22
9 Application interface 25
9:1 Interface overview 25
9:2 Clock Source Time 26
10 Media Independent Layer Specification 30
10:1 Overview 30
10:2 Time Synchronization State Machine 32
10:3 Optimal Master Clock Selection and Announcement Interval Setting State Machine 56
10:4 Message properties 75
10:5 Message formats 76
10:6 Protocol Timing Characteristics 84
11 Full-duplex, point-to-point link media-dependent layer specification 85
11:1 General 85
11:2 MD entity state machine based on full-duplex, point-to-point link 91
11:3 Message properties 105
11:4 Message format 108
11:5 Protocol Timing Characteristics 114
12 GB 15629:11 Media Dependent Layer Specification for Links 115
12:1 General 115
12:2 Message 117
12:3 Measurement of asCapable 117
12:4 State Machine 117
12:5 Format of the VendorSpecific information element 124
12:6 Synchronization message interval 125
13 Media Dependent Layer Specification for Ethernet Passive Optical Network Link Interface 125
13:1 General 125
13:2 Message properties 129
13:3 Message format 129
13:4 asCapable measurement 131
13:5 EPON link layering 131
13:6 Service Interface Definition 132
13:7 MD Entity Global Variables 134
13:8 State Machines 134
13:9 Message Transmission Interval 138
14 Timing and Synchronization Management 138
14:1 Overview 138
14:2 Default parameter dataset 138
14:3 The current parameter dataset 140
14:4 Parent parameter dataset 143
14:5 Temporal attribute parameter datasets 144
14:6 Port parameter data set 145
14:7 Port parameter statistics data set 149
14:8 Acceptable master table parameter data sets 152
15 Definition of Controlled Objects 153
15:1 Overview 153
15:2 Internet Standards Management Framework 153
15:3 MIB structure 153
15:4 Safety Precautions 153
Appendix A (Normative) Protocol Implementation Conformance Statement (PICS) Form 158
A:1 Introduction 158
A:2 Abbreviations and special symbols 158
A:3 Instructions for Completing the PICS Proforma 158
A:4 PICS proforma for bridge implementations 160
A:5 Main competencies 160
A:6 Media Access Control Methods 161
A:7 Minimal time-aware systems 162
A:8 Signals 163
A:9 Best Master Clock 163
A:10 Grandmaster-capable systems 165
A:11 Media-independent control 165
A:12 Media-dependent, full-duplex, point-to-point link 166
A:13 Media-dependent GB 15629:11 link 168
A:14 Media-dependent EPON link 169
A:15 Media-dependent CSN link 169
A:16 Media-dependent MoCA link 170
A:17 Media-dependent ITU-TG:hn link 170
Appendix B (Normative) Performance Requirements 171
B:1 Local Clock Requirements 171
B:2 Requirements for time-aware systems 174
B:3 End-to-end time synchronization performance 174
B:4 End-to-end jitter and wander performance 174
Appendix C (informative) time scale and time unit 176
C:1 Overview 176
C:2 TAI and UTC 176
C:3 NTP and GPS 177
C:4 Time-scale conversion 177
C:5 Time zones and GMT 178
Appendix D (Normative) State Diagram Symbols 179
Appendix E (Normative) CSN Network Media Layer Specification 181
E:1 Overview 181
E:2 Coordinating Shared Network Features 181
E:3 CSN link layering 181
E:4 Path Delay Measurements on CSN Backbone 182
E:5 Synchronization messages 185
E:6 CSN specific requirements 188
E:7 Optimum Master Clock Functionality 189
E:8 CSN clock and node requirements 189
APPENDIX F (INFORMATIVE) PTP PROFILES CONTAINED IN THIS DOCUMENT 190
F:1 Overview 190
F:2 Identification 190
F:3 PTP attribute value 190
F:4 PTP option 190
F:5 Performance requirements for local clocks and time-aware systems 191
References 192
foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents"
drafting:
This document is modified to adopt ISO /IEC /IEEE8802-1AS:2014 "Telecommunications and Information Exchange Bureau between Information Technology Systems"
Local and metropolitan area networks Part 1 AS: Timing and synchronization for time-sensitive applications in bridged local area networks:
The technical differences between this document and ISO /IEC /IEEE8802-1AS:2014 and their reasons are as follows:
---Added PON technologies such as 10GEPON, XGPON and 10GPON: The original text of the international standard only introduces the EPON phase
related technologies, and my country has upgraded to 10GPON such as 10GEPON and XGPON in the field of PON related technologies, so the increase
Supplemented 10GEPON and XGPON technologies, and added normative references to YD/T 2375-2019 to adapt to my country
The actual use of the system (Chapter 5):
---Change IPSec technology to TLSec technology: IPSec technology is a three-layer tunnel encryption protocol and a security scheme adopted by IETF:
TLSec technology is a wired LAN media access control security based on the ternary peer-to-peer architecture, which is the national standard GB/T 15629:3
The security scheme adopted, therefore replaces IPSec technology with TLSec technology (Chapter 15):
---Changed some normative reference documents, and replaced ISO /IEC 8802-11 with GB 15629:11, which adopts the revised international standard,
Replace IEEE802:3 (Chapter 2) with GB/T 15629:3, which adopts the international standard:
The following editorial changes have been made to this document:
--- In 3:15 of this document, add the example of China's Beidou Satellite Navigation System (BDS) as a recognized standard time source;
--- In order to comply with the relevant provisions of GB/T 1:1-2000, 1:1 and 1:2 of the original text of the international standard were merged, and the relevant technical content
keep consistent;
--- In order to adapt to the technological development of our country, the management information base code in 15:5 in the original text of the international standard is deleted:
Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents:
This document is proposed and managed by the National Information Technology Standardization Technical Committee (SAC/TC28):
This document is drafted by: China Electronics Standardization Institute, Chongqing University of Posts and Telecommunications, Shanghai Xinwen Technology Co:, Ltd:, Shandong Computing
Center (National Supercomputing Jinan Center), Kunshan Ruixiang Communication Technology Co:, Ltd:, Beijing Huawu Technology Co:, Ltd:, Beijing Telecom
Planning and Design Institute Co:, Ltd:, Shenzhen Saixi Information Technology Co:, Ltd:, Inspur Electronic Information Industry Co:, Ltd:, Jiangsu Saixi Technology Development
Co:, Ltd:, China Electronics Standardization Institute East China Branch, Peking University:
The main drafters of this document: Lei Gen, Yang Hong, Zhuo Lan, Xie Haofei, Guo Xiong, Li Gang, Huang Qingqing, Li Min, Wang Ting, Guo Chunyang, Wei Jinju,
Zhang Yan, Zhang Chi, Li Jiajing, Sun Xu, Yuan Tao, Zhang Yue, Ma Lei, Wang Yan, Li Rengang, Zhang Xudong, Zhang Chuang, Liu Yunhuai, Su Yueqi:
Telecommunication and information exchange between information technology systems
LAN and MAN bridging LAN time
Timing and synchronization for sensitive applications
1 Scope
This document specifies protocols and procedures for meeting synchronization requirements for time-sensitive applications of bridged LANs and virtual bridged LANs, including
This includes performing time synchronization maintenance during normal operation of network components, additions, deletions, failures, and network reconfigurations:
This document is applicable to enable time-sensitive applications connected to bridged LAN sites to meet their respective jitter, drift and time synchronization requirements:
requirements, including time-sensitive applications involving delivery to multiple endpoints and multiple streams:
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references
For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
this document:
GB/T 15629:3 Specific requirements for telecommunication and information exchange between information technology systems in local area network and metropolitan area network Part 3
Part: Access Method and Physical Layer Specification of Carrier Sense Multiple Access with Collision Detection (CSMA/CD) (GB/T 15629:3-2004,
ISO /IEC /IEEE8802-3:2000, MOD)
GB 15629:11 Specific requirements for telecommunication and information exchange between information technology systems for local area networks and metropolitan area networks Part 11
Sub: Wireless LAN Media Access Control and Physical Layer Specification (GB 15629:11-2003, ISO /IEC /IEEE8802-11:1999,
MOD)
GB/T 25931-2010 Accurate clock synchronization protocol for networked measurement and control systems (IEC 61588:2009, IDT)
YD/T 2375-2019 Technical Requirements for High Precision Time Synchronization
ISO /IEC /IEEE8802-1Q:2020 Telecommunications and information exchange between information technology systems Local area network and metropolitan area network No:
works)
IEEE802:1ag:2007 Local Area Network and Metropolitan Area Network Virtual Bridging LAN Corrigendum 5: Connectivity Fault Management (Localand
Fault Management)
IEEE802:3av:2009 Information Technology Part 3: Amendment 1: 10gb/s Passive Optical Network Physical Layer Specifications and Management Parameters
IEEEP802:11v Information technology inter-system telecommunication and information exchange specific requirements for local area network and metropolitan area network Part 11
Sub: Wireless LAN Media Access Control and Physical Layer Specification Amendment 8: IEEE802:11 Wireless Network Management: (Informationtech-
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