ITU-T G.813-2003
SDH 设备从时钟(SEC)的定时特性 G 系列:传输系统和媒体 数字系统和网络数字网络 数字网络的设计目标(第 15 研究组)
Timing characteristics of SDH equipment slave clocks (SEC) SERIES G: TRANSMISSION SYSTEMS AND MEDIA@ DIGITAL SYSTEMS AND NETWORKS Digital networks – Design objectives for digital networks (Study Group 15)