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No.

YD  Standards:
1YD 5006-1995  Code for design of subscriber line engineering of local telephone network
2YD 335-1988  Digital Line Signalling for Intertoll Exchange
3YD 336-1988  Digital Line Signalling for Manual Toll Exchange to Local Exchange
4YD 562-1992  General technical requirements and test methods For manual toll telephone switching equipment
5YD 1032-2000  Limits and Measurement Methods of Electromagnetic Compatibility for 900/1800MHzDigital Cellular Telecommunications System.Part 1: Mobile Station and Ancillary Equipment
6YD 343-1990  Networking requirement for point-tc-multipoint radio telecommunication systems
7YD 344-1990  Requirements for PABXs access to public telephone switching network
8YD 559-1992  Sealing tests for pressurized waveguide components and assemblies
9YD 576-1992  Semiconductor rectifier equipments For telecommunications
10YD 554-1992  Specification for channel translating equipment used on carrier systems
11YD 553-1992  Specification for group translating equipment used on carrier systems
12YD 514-1998  Technical requirements and test methods for interface between non-voice subscriber terminal and public telephone network
13YD 569-1992  Technical requirements and test methods for ringing, power sources, alarm and distribuing frame in manual toll telephone switching equipments
14YD 563-1992  Technical requirements and test methods for toll connecting boards And special boards in manual toll telephone switching equipments
15YD 557-1992  The "Xin-4" transposltion system for open-wire telecommunication lines
16YD 548-1992  The specification and test methods for conference telephone SET
17YD 547-1992  The specification and test methods for conference telephone tandem board
18YD 560-1992  The wire configurations on poles of open wire lines for toll telecommunications
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TEL: 86 10 88099016; FAX: 86 10 88097217; MSN: selina2ycx@hotmail.com

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