GB/Z 126.1-2025Process management for avionics - Electronics design - Part 1: Electrical signal properties, naming conventions and interface control document (ICD) (English PDF)
航空电子过程管理 电子设计 第1部分:电信号特性、命名约定和接口控制文件(ICD)
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 3, 2025
Implementation date
December 3, 2025
Scope
GB/Z 126.1-2025 is the English-translated version of 航空电子过程管理 电子设计 第1部分:电信号特性、命名约定和接口控制文件(ICD).
GB/Z 126.1-2025 is a report-type guiding technical document explaining how to prepare an interface control document, or ICD, for avionics electronic assemblies such as circuit board assemblies, displays and storage devices.
It provides naming conventions for the electrical signals exchanged at those interfaces, seven signal examples and a table format with general rules, table headers and basic table content, illustrated by a worked ICD in an informative annex.
The entries it describes include connector type, connector identifier, pin number, input or output direction, reference net, signal type, polarity, source, carrier type and signal waveform, and it defines electronic assembly, circuit board assembly, electrical interface and net-list.
Clause 1 states it is intended for original equipment manufacturers planning and maintaining electronic assembly interfaces. Identical to IEC TR 63238-1:2019, it was issued on 3 December 2025.
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Document preview — GB/Z 126.1-2025
National Standard of the People's Republic of China
- ICS
- 49.060
- Classification
- V 40
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- Introduction
- 1.Scope
- 2 Normative References
- 3.Terms, Definitions, and Abbreviations
- 3.1 Terms and Definitions
- 3.2 Abbreviations
- 4 ICD Description
- 4.1 Overview
- 4.2 Electrical Interface
- 4.3 Table Format
- 4.3.1 General Rules
- 4.3.2 Table Header
- 4.3.3 Basic Contents of the Table
- Appendix A (Informative) ICD Example
- References
Foreword
This document is a report-type guidance technical.
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents". Drafting.
This document is Part 1 of GB /Z 126 "Electronic Design for Aerospace Electronics Process Management". GB /Z 126 has been published as follows..
---Part 1: Electrical Signal Characteristics, Naming Conventions, and Interface Control Documents (ICDs).
This document is equivalent to IEC TR63238-1:2019 "Aeronautical Electronics Process Management - Electronic Design - Part 1: Electrical Signal Characteristics, Naming conventions and interface control documents (ICDs). The document type has been changed from an IEC technical report to a national standardization guidance document in my country..
Introduction
GB /Z 126 specifies the management and technical requirements for avionics product projects, and is proposed to consist of the following parts.
---Part 1: Electrical Signal Characteristics, Naming Conventions, and Interface Control Documents (ICDs). The purpose is to provide telecommunications interfaces for electronic components.
The naming convention is used for planning and maintaining electronic component interfaces and integration specifications.
Interface Control Documents (ICDs) are documents that specify the interfaces between various subsystems and devices of avionics products, or between them and other systems, subsystems, and devices.
The design documents for the body interface relationships detail the product's electrical interfaces, providing clear guidance for designers of avionics products.
Previously, the ICD (Integrated Device Design) for avionics products in my country was mainly developed through negotiations between the main equipment manufacturers and the airborne equipment manufacturers, and it usually required multiple rounds of iteration. Final draft.
This document defines connector type, connector identifier, pin number, input/output, reference net, signal type, polarity, and source/negative polarity.
ICD descriptions, including carrier type and signal waveforms, standardize the development and design process of avionics products, and improve the design efficiency of avionics products. Design quality.
1 Scope
This document provides information and templates for Project Interface Control Files (ICDs) used to create files containing electronic components (such as circuit board assemblies or...).
Interface Control Document (ICD) for electronic equipment projects. This document provides naming conventions for electrical signals used in electronic component interfaces and lists seven types.
Example: This document is intended for original equipment manufacturers (OEMs) to plan and maintain electronic component interfaces and integration specifications, avoiding interference with electrical signals.
Misunderstandings can lead to unnecessary design and/or integration errors and testing complications.
2 Normative references
This document has no normative references.
3 Terms, Definitions and Abbreviations
3.1 Terms and Definitions
The following terms and definitions apply to this.
3.1.1 Interface control document (ICD)
A file that defines the electrical characteristic values and names of electrical signals.
Note 1.Commonly used electrical signals include DC voltage, 5V and 3.3V.
Note 2.Commonly used electrical characteristic values include sine wave and square wave.
3.1.2 Electronic assembly
Electrical or electronic devices that are not easily disassembled unless damaged or intended for use.
Examples. circuit board assemblies or modules, displays, storage devices, printers, laptops, electrical/optical devices, etc.
[Source: IEC TS62239-2:2017, 3.1.20]
3.1.3 Circuit board assembly (CCA)
Functional electronic products based on printed circuit boards (PCBs) used to support and connect electronic or electrical components.
Note 1.Components are usually soldered onto the PCB to achieve both electrical connection and mechanical fixation.
Note 2.Circuit board assemblies are also called printed circuit board assemblies (PCAs) or printed circuit board assemblies (PCBAs).
3.1.4 Electrical interface
The interface through which electronic components exchange and interact with the outside world.
Note: Connectors can be used to implement electrical interfaces.
3.1.5 Net-list
A list of connections between two or more points.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.
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