专业英语复习试题及答案15-16单元

15-16单元复习题目及答案

一、T ranslate the following words into English.

时分同步码分多址第三代伙伴计划全球移动通信系统上行链路

吞吐量部署国际电信联盟时分双工远程（信息）处理

多路存取全球移动通信系统陆地无线接入信令协议反馈

间歇的外围设备缓冲存储器无缝服务外场测试软切换

二、Translate the following words and expressions into Chinese.

Pedestrian compatible traffic asymmetric UMTS

Harmonization inventory are called upon to macro cell

Mcps kbps HCR time-shared computers private networks

cell breathing effect multiplexed connections

三、Fill in the blanks with suitable words from the list given below.

The most applicable model for data communications requirements is the central computer with many simple terminals simultaneously. Differing from telephone communications, a data communications network must be able to a wide variety of subscriber’s equipment. Several different types of computer peripherals may appear as network terminals, and so also can computers functioning in several different ways. Terminal speeds

from 100 bits per sec to 10,000 bits per sec are likely to be important. Many terminals in current use are by the available communications services, but many of them have variable speeds. One approach to this situation is to provide a store at the terminal, but this approach is expensive.

Rec ranging buffer constrained interconnect conversing

四、Comprehension. choose the best answer according to this passage.

The rapid growth of data communications has been influenced primarily by the increasing need to move information to and from computers. Modern time-shared computers can communicate with many data stations simultaneously. Other forms of data transmission which the telephone and telegraph lines are called upon to handle are batch data transmission, real-time transmission (as in the case of airline reservation systems), banking and credit data, man-computer conversation with the aid of graphics, data collection systems and automatic meter reading. The combination of computers and data communication places such new requirements on the systems, which must handle them, that one can refer to them better as teleprocessing rather than telecommunications.[1] Teleprocessing started with the airline reservation systems, where the distribution of computer data is not as important as the maintenance of an inventory of seats for the whole system and the ability to access such an inventory rapidly at a number of distant points. Another example is that of the banks, who desired to centralize their accounting and provide access to a central file for all their branches. Basically, there are three reasons for the development of teleprocessing systems: the requirement for centralized files, the need to distribute computer services and the advantage gained by having flexibility in location of the operating staff which utilizes the system.

Initially, both the airline and banking operations can be established on a private basis, which would minimize the need for switching operations. But in both cases, the need to expand beyond private operations soon arises. In the case of the airlines, the need arises to access the facilities of other airlines; and in the case of the banks, certain common data facilities may be shared with other banks. Even though private networks may suffice for many services, the need to provide data communications between urban centers leads to regional and national networks. In the U.S., the Bell System, the independent telephone companies and specialized data communication networks are involved as carriers of such data.

1. The rapid growth of has been influenced primarily by the increasing need to move information to and from computers.

A. data stations

B. data communications

C. data transmission

D. Telecommunications

2. Modern computers can communicate with many data stations simultaneously.

A. real-time

B. private

C. time-shared

D. common

3. Teleprocessing started with the airline systems.

A. reservation

B. inventory

C. maintenance

D. accounting

4. One of the three reasons for development of teleprocessing systems is the advantage gained by having in location of the operating staff which utilizes the system.

A. flexibility

B. communication

C. memories

D. Feedback