GB/T 33558-2017 in English
VALIDTechnical requirement and method of measurement for network interface module of digital terrestrial television
- Issued on:2017-05-12
- Implemented on:2017-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 33558-2017地面数字电视网络接口模块（NIM）技术要求和测量方法》由TC242（全国音频、视频及多媒体系统与设备标准化技术委员会）归口，主管部门为工业和信息化部（电子）。
Introduction
GB/T 33558—2017 Standard Overview
This standard was proposed by the Ministry of Industry and Information Technology of the People's Republic of China to standardize the technical requirements and measurement methods of VHF/UHF network interface modules (NIM modules) for terrestrial digital TV receiving equipment. This standard applies to NIM modules with transport stream output and refers to a number of relevant national standards.
Background of Standard Formulation
With the rapid development of digital TV technology, the demand for terrestrial digital TV broadcasting systems is growing. As the core component of the receiving equipment, the performance of the NIM module is directly related to the quality and stability of signal reception. The formulation of this standard aims to unify industry technical requirements, improve product quality, and ensure compatibility and reliability.
Technical Framework Comparison
| Dimensions | Standard Requirements | Technical Indicators |
|---|---|---|
| Appearance Structure | Neat and without defects, clear markings | - No dents or scratches- Metal parts are tight and free of rust |
| Working Environment | Adapt to various environmental conditions | - Temperature range: $0~^{\circ}\mathrm{C}\sim40~^{\circ}\mathrm{C}$ - Humidity range: 25%\sim90% |
| Basic Design Parameters | Key interfaces and functional requirements | - RF input interface (required) - Transport stream output interface (required) - Control interface (1C) |
Performance indicators and test methods
RF reception performance:When the NIM module receives terrestrial digital TV signals that comply with GB20600-2006, it must meet the requirements of 5.2 except 5.2.5 in GB/T26683-2011.
RF loop output performance:If the module has an RF loop output interface, it must meet the requirements of 4.4.2 in GB/T26272-2010.
Implementation suggestions
Actual application case analysis
In actual equipment, the performance of the NIM module directly affects the TV reception effect. For example, in a complex electromagnetic environment, if the module cannot effectively resist interference, it may cause signal loss or screen freeze. Therefore, during the design and production process, the test should be strictly carried out in accordance with the standard requirements, and the module parameters should be optimized in combination with the actual situation.
It is recommended that enterprises introduce automated equipment in the production and testing links to ensure that the various indicators of the module meet the requirements. At the same time, regular maintenance and upgrades of existing equipment should be carried out to adapt to the needs of technological development.
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