Detail of YD/T 751-1995

Introduction of YD/T 751-1995

1 Subject Contents and Application Scope 1.1 Subject content This standard specifies public testing conditions, testing instruments and equipment requirements, testing environment and sampling measures, various technical index and function testing method, subscriber signalling, interoffice signaling and synchronization testing method with regards to the digital office telephone switching equipment in public telephone network. Moreover, it specifies treatment and evaluation principle of original testing data. 1.2 Application scope This standard is applicable to network access testing and on-line quality supervision inspection of switching equipment for digital computerized telephone terminal office, tandem office, tollcall-local call office, tollcall-local call-rural call office, toll office and international export office as well as production and authentication testing of digital computerized telephone switching equipment. 2 Normative References GB 3376 "Inband Pulsing Single Frequency line Signalling System for Telephone Automatic Switching Network" GB 3377 "Multi Frequency Register Signalling System for Telephone Automatic Switching Network" GB 3378 "Subscriber Line Signalling System for Telephone Automatic Switching Network" GB 3379 "Interoffice Direct Signalling System for Telephone Automatic Switching Network" GB 3380 "Ringing and Tone for Telephone Automatic Switching Network" GB 3971.2 "Interoffice Junction Digital Line Signalling System for Telephone Automatic Switching Network" GB/T 3971.3 "The Test Methods for the Technical Specifications of Multi-frequency Register Signaling for Telephone Automatic Switching Network" GB/T 5442 "The Test Methods for the Technical Specifications of Inband Pulsing Single Frequency Line Signalling System for Automatic Telephone Switching Network" GB/T 5444 "The Test Methods for the Technical Specifications of Subscriber Line Signalling for Automatic Telephone Switching Network" GB 6879 "Technical Requirements of the 30 Channels Pulse Code Modulation Multiplex Equipment at 2048 kbit/s" GB 12048 "Requirements for Clock and Synchronization Equipment Used in the Digital Network" GF 002-9002.1 "General Technical Specification for Telephone Switching Equipment of Ministry of Posts and Telecommunications" "The Technical System for Telephone Automatic Switching Network (Trail)" "Technical System of Digital and Analog Hybrid Network in Large- and Middle-sized Cities (Interim Provisions)" Red Book of CCITT-related suggestion Q.501-507 Q.511-517 Blue Book of CCITT-related suggestion Q.500 Q.511-513 Q.521-522 Q.541-544 Q.551-554 3 Public Testing Conditions 3.1 The equipment and apparatus like code pattern converter, digital echo suppressor, canceller, digital speech interpolation devices and full-zero suppressor shall not be connected in the connecting circuit under the testing. 3.2 Half connection testing method and index are adopted for the transmission index in principle. If the half connection testing conditions are not available, the full-connection testing method may be adopted.

Contents of YD/T 751-1995

1 Subject Contents and Application Scope 2 Normative References 3 Public Testing Conditions 4 Requirements for Testing Instruments and Equipment 5 Random Inspection Method and Original Testing Data Treatment Principle 6 Testing of Electrical Performance of Interfaces 7 Testing of Transmission Characteristics Index 8 Transmission Characteristics Testing and Interface Parameter between Digital Trunk Interfaces 9 Subscriber Signaling and Subscriber Line Condition 10 Interoffice Signaling System Test 11 Signal Tone and Ringing Current 12 Synchronous Performance Test 13 Basic Function Testing Additional Information: