Transmission and Multiplexing (TM) - Generic requirements for transport functionality of equipment - Part 2-1: Synchronous Digital Hierarchy (SDH) and Plesiochronous Digital Hierarchy (PDH) physical section layer functions (Endorsement of the English version EN 300417-2-1 V 1.2.1 (2001-10) as German Standard)
传输和多路复用(TM).设备传输功能的一般要求.第2-1部分:同步数字体系(SDH)和准同步数字体系(PDH)物理部分层功能