技能认证II级试题200902017单选.xlsVIP

Sheet3 Sheet2 Sheet1 再生段数据通信通道（DCC），即传送网管信息的通道，其速率是（）。| Data communication channel of regenerator section, that is channel to transport network management information. Which is this channels data rate? ( ) 64kbit/s 128kbit/s 192kbit/s 256kbit/s 已知发信功率Pt=1W,则将Pt=1W换算成电平值Pt(dBm)=（）| Suppose TX power is Pt=1W, and then change Pt=1W to receiving level value which will be ( ) 21dBm 25dBm 27dBm 30dBm K值在工程设计上通常有三个不同的取值来分别考虑，他们分别是K=∞、K=4/3和K=（）| K value can be set to three different value during engineering design. They are K=∞, K=4/3 and K=( ) 1/3 2/3 1 4/3 在接收端安装几个高度不同的天线，利用电磁波到达各天线的路径不同来减少或消除衰落的影响，这种方法称之为（）| Install several antenna with different height at receiving end, and utilize the different path of electromagnetic when it arriving at different antenna to reduce or elmiminate fading. This method is called ( ) 混合分集| Mixed diversity 角度分集| Angle diversity 5-微波设备 出现（）告警时，ZXMW PR10设备的system灯显示为黄色。| System LED of ZXMW PR10 turns to yellow indicates which alarm occur? ( ) 远端告警| Remote alarm 链路不通| Link fail E1处于环路状态| E1 is in loop status 无线网络链路告警| Radio network link alarm ZXMW PR10 32E1设备中对应的带宽和调制方式为( )。| Which are the bandwidth and modulation mode of ZXMW PR10 32E1? ( ) 14MHz QPSK 14MHz 16QAM 28MHz QPSK 28MHz 16QAM 万用表使用时要注意量程，在调测天线时，应选用的量程为( )。| Using multimeter to test must pay attention on measurement range. When debugging antenna, which range shall be selected? ( ) AC 200V DC 200V AC 20V DC 20V E1三次群的速率是（）。| What is data rate of E1 3rd group? ( ) 30.368kbps 32.368kbps 28.368kbps 34.368kbps STM－N帧中再生段DCCr的传输速率为（）。| Which one shown as below is transporting rate of regenerator section DCCr in STM-N frame? ( ) 3*32kbps 3*128kbps 3*64kbps 3*256kbps STM－N帧中复用段DCCm传输速率为（）。 | Which one shown as below is transporting rate of multiplexing section DCCm in STM-N frame? ( ) 9*64kbps 10*64kbps 9*32kbps 10*32kbps 微波安装规范 微波天线应安装在避雷针（）°的保护范围内。| Which angle range of lightening arrester should microwave antenna be installed within? ( ) ZXMW PR10设备支持的路由协议为（）。| Which protocol does