ETSI PRETS 300 166-1991 传输和复用.基于准同步或同步数字系列的2,048 Kbit/s设备的系列数字接口的物理和电气特性(DE/TM-3002)
Transmission and Multiplexing Physical/ Electrical Characteristics of Hierarchical Digital Interfaces for Equipment Using the 2048 Kbit/s- Based Plesiochronous or Synchronous Digital Hierarchies (DE/TM-3002)