GB/T 28029.13-2025 Electronic railway equipment―Train communication network(TCN)―Part 4-1:The test method of train communication network based on Wire Train Bus(WTB) English, Anglais, Englisch, Inglés, えいご
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ICS 45.060
CCS S 30
National Standard of the People's Republic of China
GB/T 28029.13-2025
Electronic railway equipment - Train communication network (TCN) - Part 4-1: The test method of train communication network based on Wire Train Bus (WTB)
轨道交通电子设备 列车通信网（TCN）第4-1部分：基于绞线式列车总线（WTB）的列车通信网络试验方法
(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 Abbreviations
5 General provisions
6 Test classification and items
7 Test methods
Bibliography
Electronic railway equipment - Train communication network (TCN) - Part 4-1: The test method of train communication network based on Wire Train Bus (WTB)
1 Scope
This document specifies the general principles, test classification and items of post-loading test of train communication network based on stranded train bus (WTB), and describes the corresponding test methods.
This document is applicable to all TCN network systems implemented according to GB/T 28029.2.
2 Normative references
The contents of the following documents constitute indispensable provisions of this document through normative references in this document. Among them, for referenced documents with a specified date, only the version corresponding to that date shall apply to this document; for referenced documents without a specified date, their latest version (including all amendment sheets) shall apply to this document.
GB/T 17178.1 Information technology - Open Systems Interconnection - Conformance testing methodology and framework - Part 1: General concepts
GB/T 28029.1-2020 Electronic railway equipment - Train communication network (TCN) - Part 1: General architecture
GB/T 28029.2-2020 Electronic railway equipment - Train communication network (TCN) - Part 2-1: Wire Train Bus (WTB)
GB/T28029.3-2020 Electronic railway equipment - Train communication network (TCN) - Part 2-2: Wire Train Bus (WTB) conformance testing
GB/T 34571-2024 Railway applications - Rules for installation of cabling on rolling stock
3 Terms and definitions
The terms and definitions defined in GB/T 17178.1, GB/T 28029.1-2020 and GB/T 28029.2-2020 as well as the following ones shall apply to this document.
3.1
correct frame
frame containing the correct WTB preamble, a certain number of "0" and "1" bits, and a termination delimiter
Note: See 4.8.1.3 in GB/T 28029.2-2020 for WTB preamble, 4.8.1.2 in GB/T 28029.2-2020 for bit code, the length of WTB frame is consistent with the length indicated in the link data length field, see the frame check sequence calculation rule in 5.2.1 in GB/T 28029.2-2020 for FCS of WTB frame, and see 4.8.1.4 in GB/T 28029.2-2020 for termination delimiter.
3.2
incorrect frame
WTB frame preamble exception, WTB frame termination delimiter exception, WTB frame length exception, WTB frame FCS error, or WTB master-slave type mismatch
Note: The preamble of WTB frame abnormally indicates that the preamble of WTB does not meet the requirements of 4.8.1.3 in GB/T 28029.2-2020; The WTB termination delimiter with abnormal WTB frame termination delimiter does not meet the requirements of 4.8.1.4 in GB/T 28029.2-2020; The WTB frame length exception is that the WTB frame length does not match the length indicated in the link data length field; The WTB frame FCS error means that the FCS calculated according to the frame check sequence calculation rule of 5.2.1 in GB/T 28029.2-2020 does not match the actual FCS; The WTB master-slave type mismatch frame is that the WTB slave frame type does not match its previous master frame type (process data frame, message data frame, monitoring data frame).
3.3
frame error rate
number of abnormal frames is divided by a ratio of the sum of the number of valid frames and the number of abnormal frames within a predetermined time
3.4
bus bandwidth occupancy
ratio of the time occupied by valid frames on the bus divided by the total acquisition time after the initial WTB run is completed
3.5
line noise
undesired disturbance in a line that obscures or disturbs a useful signal
4 Abbreviations
The following abbreviations apply to this document.
FCS: Frame Check Sequence
PICS: Protocol Implementation Conformance Statement
PIXIT: Protocol Implementation Extra Information for Testing
WTB: Wire Train Bus
5 General provisions
5.1 Requirements for vehicles under test
5.1.1 Transmission medium requirements
WTB cable shall meet the requirements of 4.3.4 in GB/T 28029.2-2020.
The WTB connector shall meet the requirements of 4.4.5 in GB/T 28029.2-2020.
5.1.2 Network node requirements
All WTB nodes of the tested train shall pass the conformance test according to GB/T 28029.3-2020.
It should be able to query the system configuration information of WTB nodes, which has the function of diagnostic logging.
5.1.3 Network protocol behavior requirements
The initial operation of the WTB network shall be completed according to GB/T 28029.2-2020.
The WTB network shall complete the initial operation according to the protocol.
5.1.4 Network system construction requirements
5.1.4.1 The connector used to transmit the WTB signal shall be 360° shielded contact treatment with the WTB cable.
5.1.4.2 The contact material of the WTB connector is copper, the surface is gold-plated, and the contact resistance should not be greater than 3mΩ.
5.1.4.3 It should not be tapped in WTB lines.
