AU指针的作用是()。
A:指示高阶VC首字节在AU净负荷中的位置 B:指示低阶VC首字节在TU净负荷中的位置 C:对低阶VC进行速率适配
金(Au)是()。
A:体心立方晶格 B:面心立方晶格 C:密排六方方晶格
如下图所示的传输链路上,网元A为1650SM设备,其余网元B,C,D,E,F为1660SM设备,网元A的一路STM1的信号与网元B的STM1端口连接,该路信号再以AU4单向连接到网元B的另一个STM-16端口的某一个AU4上,该AU4通道在链路上一直中继传输到网元F,最后终接于F的某一个STM1端口,问当A,B网元之间的线路中断后,在网元B的STM-1端口单元上会有()告警
A:LOS B:LOF C:MS-AIS D:AU-AIS E:AU-LOP
AU指针的主要作用是()。
A:对低阶VC速率适配,容纳其对应于AU的频差相差 B:对高阶VC速率适配,容纳其对应于AU的频差相差 C:指示高阶VC首字节在AU净负荷中的位置 D:指示低阶VC首字节在TU净负荷中的位置
当收端检测出AU-PTR为1023时,分别会有()告警。
A:AU-AIS B:MS_RDI C:AU-LOP D:MS-BBE
______ after his death that he was recognized as a great composer.
A:It was not until B:It is until C:It was until D:Not until
______ after his death that he was recognized as a great scientist.
A:It was not until B:It is until C:It was until D:Not until
Although nobody {{U}}acknowledged{{/U}} his presence, Mr. Smith knew he had been recognized.
A:recognized B:assented C:admitted D:attributed