2018年中級(jí)通信工程師傳輸與接入每日一練（7-31）

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目前傳輸與接入專業(yè)已經(jīng)分為兩個(gè)不同的方向：無線與有線，由于新版本剛出，所以目前每日一練不區(qū)分無線與有線，后期會(huì)有不同版本的每日一練公布。

1、通信衛(wèi)星中的雙變頻轉(zhuǎn)發(fā)器先把接收到的上行信號(hào)變?yōu)椋ǎ┬盘?hào)，經(jīng)放大限幅以后再變?yōu)橄滦行盘?hào)。
 處理轉(zhuǎn)發(fā)器則要對(duì)信號(hào)進(jìn)行（）處理，然后經(jīng)過重新調(diào)制、上變頻、功率放大后發(fā)向地面站。

A．基帶
B．中頻
C．射頻
D．?dāng)?shù)字

A．放大
B．壓縮
C．交換
D．解調(diào)

2、下列調(diào)制方式中，（）是ITU-T關(guān)于ADSL標(biāo)準(zhǔn)建議采用的。

A．2B1Q
B．DMT
C．TC-PAM
D．BPSK

3、會(huì)議電視業(yè)務(wù)向用戶提供以視覺為主、多媒體的視像通信，其接入方式基于（）接入組網(wǎng)。

A．寬帶
B．窄帶
C．移動(dòng)
D．無線

4、第三代移動(dòng)通信（3G）與第二代移動(dòng)通信（2G）相比，提供的新業(yè)務(wù)能力是（）。

A．三方通話等語音增值服務(wù)
B．話費(fèi)查詢等數(shù)據(jù)增值服務(wù)
C．短信息業(yè)務(wù)
D．高于300kbps的數(shù)據(jù)下載業(yè)務(wù)

5、電信運(yùn)營商提供的虛擬網(wǎng)業(yè)務(wù)可以實(shí)現(xiàn)（）的功能，且可幫助用戶大大節(jié)省投資費(fèi)用。

A．用戶小交換機(jī)
B．短信平臺(tái)
C．寬帶接入
D．視頻監(jiān)控

6、CPU通過總線與內(nèi)存和輸入/輸出設(shè)備連接，下列說法錯(cuò)誤的是（）。

A．總線是連接CPU、內(nèi)存、I/O設(shè)備等部件的一組公共信號(hào)線

B．總線分?jǐn)?shù)據(jù)總線、地址總線和控制總線，程序指令和數(shù)據(jù)都存于內(nèi)存，其中數(shù)據(jù)通過數(shù)據(jù)總線調(diào)入調(diào)出CPU，而程序指令通過控制總線調(diào)入CPU執(zhí)行 

C．DMA技術(shù)使外圍設(shè)備與CPU并行工作，直接將數(shù)據(jù)在外設(shè)和內(nèi)存之間交換
D．內(nèi)存的工作速度相對(duì)于CPU的運(yùn)算速度要低很多

7、為兼顧穩(wěn)定性、可靠性和經(jīng)濟(jì)性，在通信網(wǎng)中經(jīng)常采用（）的網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)。

A．網(wǎng)狀圖

B．星型網(wǎng)

C．環(huán)型網(wǎng)

D．復(fù)合型網(wǎng) 

8、With the explosive popularity of mobile devices, we have witnessed a steady increase in demand for mobile date service. In addition mobile users also expect to connect to the Internet for communicate and access to services through the best suitable connection, anywhere and at anytime. Although the seamless roaming capability is well supported in conventional. Cellular communication networks, roaming and interworking technologies are still immature in heterogenous wireless networks. Seamless roaming over heterogenous wireless networks will be an ongoing and improved process, due to the requirements from both end users and network administrators. From the wireless access networks belonging to different administrative domains, mobile users cannot always identify at every instance which network is the best one to access for their service. It is highly demanded to establish a network architecture which can facilitate mobile terminals to access the appropriate network in a cost-effective way. If a mobile user wants to move from one network to another with continuous service, the terminals have to cope with network change to maintain service seamlessly. Quality of service is a major issue that the end users should be provided with the satisfying service, while the network workload and cost should not too much increased. In addition, since end users are provided with numerous service ranging from Voice-over-IP to Video-on-Demand services, it is expected that users can experience the same quality for all the different service. Therefore, the network architecture need to be designed in such a way that the quality mechanism is incorporated so that users are served according to their individual QoS requirements.

Based on the paragraph above, at present, seamless roaming over heterogenous wireless network is （） in conventional cellular communication networks, Because of （）, mobile users cannot always identify at every instance which network is the best one to access for their services. To satisfy the users QoS requirements, the network architecture design should include （）.

A．better than

B．maturer than

C．a(chǎn)s good as

D．not as good as 

A．the different network administrative domains

B．the same network administrative domains and mobile users

C．mobile users

D．the same network administrative domains 

A．Voice -over -IP

B．the quality mechanism 

C．workload

D．Video-on-Demand

9、電信業(yè)務(wù)經(jīng)營者向電信用戶提供電信服務(wù)時(shí)，應(yīng)遵循的原則不包括（ ）。

A.價(jià)格合理
B.迅速
C.安全
D.穩(wěn)定

10、通信網(wǎng)中，（ ）傳輸媒質(zhì)不適合于局間通信。

A.衛(wèi)星
B.光纜
C.雙絞線
D.微波

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考試輔導(dǎo)：通信工程師網(wǎng)絡(luò)課堂課堂，講師授課，輕松備考