3、Basic multiplexing structure for synchronous digital hierarchy signals
6、Temporary regulation for design of synchronous digital hierarchy(SDH)microwave relay telecommunication system engineering
2、Frame structure for synchronous digital hierarchy signal
7、Methods of measurement for synchronous digital hierarchy(SDH)optical fiber cable line systems
5、Requirements for synchronous digital hierarchy (SDH) optical fiber cable line systems of national public telecommunication network
1、Synchronous digital hierarchy bit rates
4、Specifications for synchronous digital hierarchy (SDH) multiplex equipment
