GB/T 45278.1-2025 Information technology―Time aware network―Part 1: Protocol English, Anglais, Englisch, Inglés, えいご
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ICS 35.110
CCS L 78
National Standard of the People’s Republic of China
GB/T 45278.1-2025
Information technology –
Time aware network –
Prat 1: Protocol
信息技术 时间明晰网络第1部分：协议
(English Translation)
Issue date: 2025-02-28 Implementation date: 2025-09-01
Issued by the State Administration for Market Regulation
the Standardization Administration of the People's Republic of China
Contents
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviation
5 TAN overview of protocols
6 TAN control layer data frame structure
7 TAN control layer clock synchronization and transmission control with definable delay
8 TAN control layer data exchange and transmission
Annex A (informative) Time-clear network and wireless network interconnection scenarios
Information technology – Time aware -
Part 1: Protocol
1 Scope
This document specifies the frame structure of time aware network (TAN) control layer data, TAN control layer clock synchronization and transmission control with definable delay, TAN control layer data exchange and transmission, etc.
This document is applicable to the development and application of MAC layer switching devices with strict time requirements and data fault-tolerant transmission capabilities.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies.
GB/T 9387.1-1998 Information technology - Open systems interconnection - Basic reference model - Part 1: The basic model
GB/T 15629.3-2014 Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specification
GB/T 25931-2010 Precision clock synchronization protocol for networked measurement and control systems
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
time aware network
network based on Ethernet and clock synchronization that performs time stamping, scheduling, and fault-tolerant transmission of data
3.2
TAN switch
device with TAN frame switching capability
3.3
TAN field
network domain composed entirely of TAN switches
3.4
data terminal equipment
data source device or data destination device connected to a TAN
3.5
accumulated delay
The sum of the time consumed by all TAN switches that a TAN clock synchronization frame has passed through
3.6
network access time
The moment when a TAN switch receives data at its Ethernet interface
3.7
network delay
The time difference between the moment data enters the TAN domain and the moment it exits the TAN domain
3.8
network outgoing time
The moment when a TAN switch transmits data from its Ethernet interface
3.9
master clock switch
TAN switch that provides clock synchronization for all TAN switches within a TAN domain
3.10
external clock source
clock device that provides precise time to the TAN domain
Note: Including but not limited to atomic clocks and Beidou clock sources.
3.11
internal clock source
TAN switch that provides precise time to other TAN switches
3.12
working clock source
The unique clock source in a TAN domain that provides reference time
4 Abbreviation
The following abbreviations apply to this document
CRC: Cyclic Redundancy Check
EPDU: Ethernet Protocol Data Unit
ID: Identity IP: Internet Protocol
MAC: Media Access Control
MCS: Master Clock Switch
OSI: Open System Interconnection
PTP: Precision Time Protocol
TAN: Time Aware Network
TAN-W: Time Aware Network-Wireless
WLAN: Wireless Local Area Network
5G: the fifth generation mobile communication technology (5thGeneration Mobile Communication Technology)
5 TAN overview of protocols
5.1 Location of the TAN protocol corresponding to the OSI reference model
The TAN protocol adds a TAN control layer to the MAC sublayer of the data link layer of the GB/T 9387.1-1998 OSI model. The TAN control layer includes fields such as switching device ID, path information, and time label. Based on the time label, data transmission control with definable delay is completed, and data exchange and path learning are performed based on switching device ID and path information. The corresponding relationship between the TAN protocol and the OSI reference model and GB/T 15629.3-2014 is shown in Figure 1.
5.2 TAN Physical layer
See GB/T 15629.3-2014 Physical layer for TAN physical layer.
5.3 TAN Control layer
The TAN frame structure of the TAN control layer is shown in Chapter 6, the mechanism of clock synchronization and definable delay transmission control is shown in Chapter 7, and the mechanism of TAN data exchange and transmission is shown in Chapter 8.
5.4 MAC layer of TAN
See the MAC layer of GB/T 15629.3-2014 for TAN media access control layer.
