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Unit 8 Computer Networking

Text 1 Data Communications

Exercises

Fill in the blanks with appropriate words according to the text.

The end equipment is either __generates the digital information for transmission_ or_ uses the received digital data.

When digital data are transmitted, they are _in serial form_.

_DTE___ is data terminal equipment.

_STACO is the corresponding unit at the secondaries.

Between the DTEs, first is _the modems_, and then is the communications equipment__.

_DCE__ accepts the serial data stream from the DTE.

At the transmit end, the modem can be considered a form of _digital-to-analog_ converter, while at the receive end, it can be considered a form of analog-to-digital__ converter.

DCE converts the received_ analog signal_ to a serial digital data stream_.

Multiple choices.

The end equipment in a communication system includes?_ABCD_.

A. computers???????????????????????????? B. CRTs

C. printers?????????????????????? ??????? D. keyboards

The equipment?B_D__.

A. manipulates digital information internally in serial form

B. manipulates digital information internally in word units

C. transfers the number of bits in parallel

D. transfers the number of bits in serial form

DTE is?__BD_.

A. Digital T-carrier???????????????

B. data terminal equipment

C. satellite??????????????????????????

D. the last piece of equipment that belonged to the subscriber in a data link system

There are AB_ between the DTEs.

A. the modem

B. communications equipment

C. digital-to-analog converter

D. will be replaced by an updated standard

Translate and analyze the following sentences.

This equipment generally operates digital information internally in word units.

句子组成：in word units介词短语作方式状语修饰operates

翻译：_这种设备通常在内部以字为单位处理数字信息the received analog signal to a serial digital data stream.

句子组成：convert……to指将……转换成……

翻译： 它把接收到的模拟信号转换成串行数字数据流Data communications equipment (DCE) accepts the serial data stream from the DTE.

句子组成：from the DTE修饰动

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