This standard specifies the technical requirements and corresponding measurement methods for cable digital television systems. Any equivalent measurement method that can ensure the same measurement uncertainty can also be used. In case of dispute, this standard shall prevail. This standard is applicable to the design, construction, acceptance, and operation maintenance of cable digital television systems. 2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB 3174-1995 Technical Specification for PAL System Television Broadcasting GB/T 3659-1983 Test Methods for Television Video Channels GB/T 7401-1987 Subjective Evaluation Methods for Color Television Image Quality GB/T14857-1993 Specification for Encoding Parameters of Digital Television in Studios GB/T 15943-1995 Measurement Methods for Technical Specifications of Broadcasting Audio Channels GB/T 16463-1996 Subjective Evaluation Methods and Technical Requirements for Sound Quality of Broadcasting Programs GB/T 17975.1-2000 General Information Technology for Moving Images and Associated Sound Information Coding Part 1: System GB/T 20030-2005HFC Network Equipment Management System Specification GY/T 106-1999 Technical Specification for Cable Television Broadcasting System GY/T 107-1992 Maintenance Regulations for Television Center Broadcasting Control System GY/T 121-1995 Measurement Methods for Cable Television System GY/T 134-1998 Subjective Evaluation of Digital Television Image Quality GY/T 155-2000 Video Parameter Values for High Definition Television Program Production and Exchange GY/T 157-2000 Digital Video Signal for High Definition Television in Studio Interface GY/T 158-2000 Digital Audio Signal Interface GY/T 161-2000 Specification for the Transmission of Digital Audio and Auxiliary Data in the Satellite Data Space of Digital Television GY/T 165-2000 Technical Specifications and Measurement Methods for Digital Broadcasting Channels in Television Center Broadcasting Control Systems GY/T 170-2001 Specification for Encoding and Modulation of Cable Digital Television Broadcasting Channels
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China