DIN EN 300462-4-2:2000
传输和多路复用(TM).同步网络的一般要求.第4-2部分:适用于同步数字层次(SDH)和准同步数字(PDH)层次设备的从属时钟的计时特征.执行一致性声明形式规范
Transmission and Multiplexing (TM) - Generic requirements for synchronization networks - Part 4-2: Timing characteristics of slave clocks suitable for synchronization supply to Synchronous Digital Hierarchy (SDH) and Plesiochronous Digital Hierarchy (PDH)