【多选题】
光网络设备调测时,一旦发生光功率过高就容易导致烧毁光模块事故,以下操作符合规范要求的是()___
A. 输入光信号在接入单板接收光口前,必须先测试光功率是否满足调测要求,禁止光功率超过接收过载点时进行不加光衰自环的操作,保证输入光功率不超过器件允许的最大值
B. 使用OTDR等能输出大功率光信号的仪器对光路进行测量时,要将通信设备与光路断
C. 调测前,必须先掌握单板要求的接收光功率参数,严格按照调测指导书说明的受光功率要求进行调测
D. 进行过载点测试时,禁止超过国标10个dB以上
E.
F.
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相关试题
【多选题】
光纤按按缆芯结构分为()。___
A. 中心束管式
B. 带状式
C. 骨架式
D. 层绞式
E.
F.
【多选题】
光纤的色散可以分为哪几部分()___
A. 波导色散
B. 传输色散
C. 模式色散
D. 材料色散
E.
F.
【多选题】
光纤根据所传输的模数可分为____和____。___
A. 单模光纤
B. 多模光纤
C.
D.
E.
F.
【多选题】
光纤通信的特点有哪些()。___
A. 保密性好,无串话干扰
B. 损耗低,抗电磁干扰
C. 传输频带宽、通信容量大
D. 线径细、重量轻,资源丰富
E.
F.
【多选题】
光纤线路损耗测量采取的方法一般是()相结合的测量方法。___
A. 光时域反射仪
B. 光源
C. 2M表
D. 光功率计
E.
F.
【多选题】
华为IAD支持VOIP协议类型()___
A. MGCP
B. H.248
C. SIP
D. H.323
E.
F.
【多选题】
集团短信性能监控中,需要关注的指标有( )___
A. MT成功率
B. MO成功率
C. MT总量
D. MO总量
E.
F.
【多选题】
集团短信业务 网络侧维护监控,主要工作内容有( )___
A. 企业信息机通过行业网关维测台进行端口连接状态、短信流量检查
B. 通过网络投诉支撑平台检查相应端口短信发送记录
C. 每季度上门巡检,对企业信息机进行健康检查,早发现早处理,最大限度的保障客户使用业务
D. 主动询问客户是否发生故障
E.
F.
【多选题】
交换机上的以太帧交换依靠 MAC地址映射表,这个表可以通过______来建立___
A. 交换机自行学习
B. 手工添加映射表项
C. 交换机之间相互交换目的地的位置信息
D. 生成树协议交互学习
E.
F.
【多选题】
局域网类型是?___
A. 以太网
B. 交换以太网
C. 令牌环网
D. FDDI
E.
F.
【多选题】
可以分割广播域的设备有( )___
A. 网桥
B. 中继器
C. 具有VLAN功能的以太网交换机
D. 路由器
E.
F.
【多选题】
可以同时实现语音和数据传输的设备有()___
A. PBX
B. ONU
C. IAD
D. AP
E.
F.
【多选题】
客户自行开发业务短信发送模块,在业务服务器上通过( )或( ),直接将短信送入移动短信系统。___
A. 基站
B. 移动专线(CMNET)
C. 互联网
D. CMWAP
E.
F.
【多选题】
路由连接模式获取IP的方式有( )___
A. DHCP
B. 静态IP
C. PPPOE
D.
E.
F.
【多选题】
某站出现MS-AIS告警的原因可能是( )。___
A. 对端站下插AIS告警
B. 对端站时钟板故障
C. 本板接收部分故障
D. 本站发送光模块故障
E.
F.
【多选题】
某站出现R-LOF告警的原因可能是( )。___
A. 接收信号衰减过大
B. 对端站发送信号无帧结构
C. 本板接收方向故障
D. 本端支路故障
E.
F.
【多选题】
某站出现R-OOF告警的原因可能是( )。 ___
A. 接收信号衰减过大
B. 传输过程误码过大
C. 对端站发送部分故障
D. 本站接收方向故障
E.
F.
【多选题】
目前集团短信业务最主要的两种产品是( )___
A. 短信机
B. 企业信息机
C. 企业短信平台
D. 短信直联
E.
F.
【多选题】
哪两项会阻止广播流量通过网络.( ) ___
A. 网桥
B. 路由器
C. 交换机
D. VLAN
E.
F.
【多选题】
哪种告警是由MSOH检测的?( )。 ___
A. HP-TIM
B. HP-SLM
C. MS-RDI
D. MS-AIS
E.
F.
【多选题】
请选择误码产生的原因()___
A. SDH设备本身产生的误码
B. 色散引起的码间干扰
C. 各种噪声源
D. 定位抖动产生的误码
E.
F.
【多选题】
球机控制协议自适应有哪些优势?( )___
A. 球机控制协议不用拨码
B. 自动适应Samsung协议
C. 自动适应Hikvision、Pelco-P、Pelco-D协议
D. 修改球机控制协议时不用把球拆下来
E.
F.
【多选题】
人工设置OTDR测量参数包括哪些?___
A. 平均时间
B. 测量范围
C. 波长选择
D. 脉宽
E.
F.
【多选题】
数据链路层包含哪2个子层( )___
A. LLC
B. MAC
C. TCP
D. UDP
E.
F.
【多选题】
双GGSN、双传输、双路由器GPRS接入有以下优点( ).___
A. 可实现GGSN、传输、路由器的双备份,属于完善的双路由冗余备份方案
B. 支持移动终端地址静态分配方式
C. 组网简单,客户投入不大
D. 实现多设备、多路由冗余备份
E.
F.
【多选题】
通道保护环,在环路正常的情况下,拔纤后未发生倒换,这种情况有可能是因为什么原因( )。___
A. 支路通道设置为无保护
B. 拔的是备环光纤
C. 协议未启动
D. 备环通道不可用
E.
F.
【多选题】
通过服务器负均衡器,对流量进行合理分配,可以带来以下好处:( ) ___
A. 提高了系统的反应速度与总体性能;
B. 提高系统的可靠性
C. 增强系统的扩展能力
D. 简化了管理
E.
F.
【多选题】
通信线路施工中客户末端接入方式可选择()进行___
A. 地插座方式
B. 墙壁插座方式
C. 明线接线盒方式
D. 暗线接线盒方式
E.
F.
【多选题】
网管S200上报温度越限告警,出现的可能原因和解决方法有( )___
A. 风扇防尘网过脏,清洗风扇防尘网
B. 风扇运行不正常,检查风扇电源,更换风扇;
C. 网管设置的温度门限太低,重新设置单板的温度门限;
D. 检查机房环境温度是否正常
E.
F.
【多选题】
网络的延迟(delay)定义了网络把数据从一个网络节点传送到另一个网络节点所需要的时间。网络延迟包括_________
A. 传播延迟(propagation delay)
B. 交换延迟(switching delay)
C. 介质访问延迟(access delay)
D. 队列延迟(queuing delay)
E.
F.
【多选题】
系统误码测试可分为( )。 ___
A. 停业务测试
B. 在线测试
C. 环回测试
D.
E.
F.
【多选题】
下列关于地址池的描述,正确的说法是___
A. 只能定义一个地址池
B. 地址池中的地址必须是连续的
C. 当某个地址池已和某个访问控制列表关联时,不允许删除这个地址池
D. 地址池即可与访问控制列表关联,又可与具体接口关联
E.
F.
【多选题】
下列关于路由器特点的描述,正确的是________
A. 是网络层设备
B. 根据链路层信息进行路由转发
C. 提供丰富的接口类型
D. 可以支持多种路由协议
E.
F.
【多选题】
下列关于网桥和交换机的说法哪些是正确的( ) ___
A. 交换机基于软件,网桥基于硬件.
B. 网桥和交换机都转发二层广播。
C. 网桥比交换机速度快。
D. 网桥和交换机都通过二层地址转发。
E.
F.
【多选题】
下列哪些是国标中规定的误码性能参数( )。___
A. 误码秒(ESR)
B. 严重误码秒(SESR)
C. 背景块差错比(BBER)
D. 时延(S)
E.
F.
【多选题】
下列属于中兴SDH的设备类型包括( )___
A. ZXMPS100
B. ZXMPS200
C. ZXMPS320
D. ZXCTN 6100
E.
F.
【多选题】
下列说法正确的有( )___
A. 以太网专线(EPL)具有两个业务接入点,对用户以太网MAC帧进行点到点的透明传送
B. EVPL与EPL相比,由于EVPL是逻辑上的用户隔离,因此安全性比EPL较差
C. EPL需要L2交换功能和MAC地址学习
D. EPTREE是多点到点的汇聚型业务,其拓扑结构是多个点到点的连接汇聚到中心节点的一个以太网物理接口
E.
F.
【多选题】
下列选项中哪些是数据链路层的主要功能( )___
A. 提供对物理层的控制
B. 差错控制
C. 流量控制
D. 决定传输报文的最佳路由
E.
F.
【多选题】
下面对SDH信号特征描述正确的有( )。___
A. 以比特为基础的块状帧结构
B. 纵向9行,横向270×N列
C. 由左到右、由上到下顺序排成串行码流依次传输
D. 传输一帧需125μs,每秒8000帧
E.
F.
【多选题】
下面关于SDH复帧的描述,错误的有()___
A. 622M信号中,一帧信号中包含有63个复帧
B. 一秒钟可以传递8000个复帧
C. 622M信号中,一个复帧的4帧分别位于本帧的4个VC4中
D. 155M信号中,一个复帧的4帧分别位于前后相连的4个VC4中
E.
F.
推荐试题
【单选题】
Tom is a book lover. ______ likes reading very much.
A. He B. She C. You D. It
【单选题】
—May I listen to the music here, Mr. White?
—Sorry, you’d better it like that.
A. not to do B. not do to
C. dont do D. not do
【单选题】
3.—Did you have a good time at Lauras birthday party?
— Yes, indeed. Its several years ________ I enjoyed myself so much.
A. when B. before C. since D. that
【单选题】
4. —___________ is the Summer Palace from here?
About three kilometers away. You can take the No. 35 bus.
A. How long B. How far C. How often D. How much
【单选题】
5. I was looking for a birthday gift for my mother, but I couldnt find ______ suitable.
A. anything B. something C. nothing D. everything
【单选题】
6. A friend of my ____ and I are going to visit_______ next week.
A. father; Browns B. father's; Browns
C. father; the Browns D. father's; the Browns
【单选题】
7. She ______ very hard since she came to our school.
A. studies B. has studied C. is studying D. studied
【单选题】
8. — Who will send you to the new school, your mom or your dad?
— _______. Ill go there by myself.
A. Both B. Either C. Neither D. None
【单选题】
9.—Well do what we can ____English well this term.
—It’s high time for you to work hard.
A. study B.to study C. be studied D. be studying
【单选题】
10. —I’m going to Flower Bookstore. Could you tell me ______?
— Sorry, I don’t know. I’m new here.
A. where it is B. where was it C. where is it D. where it was
【单选题】
11. How do you like the dishes, Eric?
— Fantastic! Nothing tastes ________.
A. nice B. better C. terrible D. worse
【单选题】
12. ______ Lin Feng has to work late, she always wears a smile on her face.
A. Because B. If C. Until D. Though
【单选题】
13.You can save money _______ you buy cheaper things.
A. before B. unless C. if D. until
【单选题】
14. We will have a _________ holiday after the exam.
A. two-month B. two month’s C. two month D. two-months
【单选题】
15. —We will build an underground in Xuzhou before 2015.
— Wow, _______! Will it pass our place?
A. what an excited news B. how excited the news is
C. what exciting news D. how exciting
【单选题】
16. — Emily, here’s a dictionary.I hope it will help you in some way.
— Thank you.It’s ________ what I need.
A. almost B. still C. only D. just
【单选题】
17. —Oh.I’m hungry.Mum, can I have the hamburger on the plate?
—No.It tastes .
A. terribly B. terrible C. good D. well
【单选题】
18. —We can invite our teachers to the farewell party next Saturday.
—Yes, ______? I’ll call them at once.
A. what for B. what C. why not D. why
【单选题】
19.You can ________ ask the old man to move away to any other place because he has lived ________ here for at least sixty years.
A. hardly; alone B. hard; alone
C. hardly; lonely D. hardly; lonely
【单选题】
20.—I’m going back to see my grandparents this weekend.
—________.
A. It’s very nice of you B. You’d better hurry
C. Say goodbye to them D. Give my best wishes to them
【单选题】
21.—Why not take ____ umbrella with the sign “Made in China”? It is useful.
—What _______ good advice it is!
A. an; a B. a; a C. an; \ D. \; a
【单选题】
22. —Do you know the boy________ is sitting next to Peter?
— Yes. He is Peter’s friend. They are celebrating his ________ birthday.
A. who; ninth B. that; ninth C. /; ninth D. which; ninth
【单选题】
23. It was dark, ______ I couldnt see what was happening.
A. or B. though C. but D. so
【单选题】
24.—You can use MSN to talk with Vivien on the Internet.
—I know. But can you tell me ________?
A. what I can use it B. when I can use it
C. why can I use it D. how can I use it
【单选题】
25. _______ are you going to the School Uniform Exhibition, Amy ?
To learn about different styles of school uniform.
A. What B. Where C. Which D. Why
【单选题】
( ) 26. Where does the writer of "The little Prince" come from?
A.England. B.France. C.America. D.China.
【单选题】
( ) 27. What does the prince do after the fox tells him a secret?
A.He cares more about a flower and a sheep.
B.He meets many more strange adults on other planets.
C.He realizes his love for the rose and he goes back to his planet.
D.He discovers interesting things such as a snake, other roses and a fox
【单选题】
( ) 28. What does "The little Prince" mainly talk about? It' s about _________.
A.the adult world B.the planet B -612
C.a rose and a fox D.the adventure of a young prince
【单选题】
( ) 29. What is the writer's main purpose(目的)in writing this passage?
A.To tell the readers his life story.
B.To tell people what kind of person his father was.
C.To tell the readers what present he got from his father.
D. To let people know how poor he was.
【单选题】
( ) 30. Why did the father not ask his son not to do this and do that?
A.Because he felt quite confident of his son.
B.Because he was born from a poor family.
C.Because he was a man of few words.
D.Because he didn't want to be much too strict with his son.
【单选题】
( ) 31. What would someone learn from this passage?
A.How to live by oneself. B.How to stand on one's own feet.
C.What a good father should do. D.What the self-important is like.
【单选题】
( ) 32. What may be the proper Chinese for the underlined part in the passage?
A.闲暇时光 B.学费 C.精神空虚 D.经济不足
【单选题】
( ) 33. Why did Natalie Smith pay for the six cars behind her?
A. She had seven tickets.
B. She hoped to please others.
C. She knew the car drivers well.
D. She wanted to show kindness.
【单选题】
( ) 34. Judy Foreman copied down the phrase because she ___ .
A. thought it was beautifully written
B. wanted to know what it really meant
C. decided to write it on a warehouse wall
D. wanted her husband to put it up in the classroom
【单选题】
( ) 35. Who came up with the phrase according to the passage?
A. Judy Foreman. B. Natalie Smith. C. Anne Herbert D. Alice Johnson.
【单选题】
( ) 36. What can we infer from the last paragraph?
A. People should practice random kindness to those in need.
B. People who receive kindness are likely to offer it to others.
C. People should practice random kindness to strangers they meet.
D. People who receive kindness are likely to pay it back to the giver.
【单选题】
( ) 37.The greatest river for navigation is ___________.
A. the Nile B. the Amazon C. the Mekong D. the Mississippi
【单选题】
( ) 38. From a dam, people can use the water for ___________.
A. keeping the rivers clean B. only making electricity
C. irrigation and making electricity D. washing clothes
【单选题】
( ) 39. The water in the river is polluted because of _____________.
A. people's drinking water too much B. people's swimming in the river too much
C. chemicals and other materials D. people's building a dam across a river
【单选题】
( ) 40. The best title of the passage is ___________.
A. Rivers in Cities B. The importance of Rivers
C. Transportation D. Natural Resources