NF Z85-462-5-1*NF EN 300462-5-1:2000 传输和多路转换(TM)同步网的一般要求 第5-1部分:适用于同步数字层(SGH)设备操作的附属钟的计时特性
Transmission and Multiplexing (TM) - Generic requirements for synchronization networks - Part 5-1 : timing characteristics of slave clocks suitable for operation in Synchronous Digital Hierarchy (SDH) equipment