<Sysname> display controller cpos 2/2/1
Cpos2/2/1
Current state: DOWN
Description: Cpos2/2/1 Interface
Last clearing of counters: Never
Current system time:2020-02-20 12:56:36
Last time when physical state changed to up:-
Last time when physical state changed to down:2020-02-19 12:06:46
Port connector type: No connector
Physical layer is packet over SDH
Port speed type: STM-1
Multiplex mode: AU-4
Loopback is not set
Clock source: Slave
Clock grade: Quality unknown(existing synchronization network)
Clock grade参数 即 时钟等级,是从SDH开销字节S1中读取出来的,该字节的5~8 bit标识STM-N的同步状态,是同步信号质量等级(QL)的标志
按照ITU-T中对S1字节5~8bit的定义,解释如下:
SETS(Synchronous Equipment Timing Source -----------SDH设备时钟源信号,网元时钟
DNU(Do not use for synchronization) -------------不能用于同步,一般是为了防止时钟形成环路
Quality unknown(existing synchronization network) ------同步质量不知道,等级未知
S1是从SDH帧中解析出来的,SSM是一个动态的过程,跟cpos口所在的sdh路径时钟源的状态以及在路径中的位置有关,不同接口时钟等级不一样。
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