计算机专业英语第九章部分翻译

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2024年3月11日发(作者：)

COMMUNICATION CHANNELS

Communication channels are an essential element of every communication system.

These channels actually carry the data from one computer to another. There are two

categories of communication channels. One category connects sending and receiving

devices by providing a physical connection such as a wire or cable. The other

category is wireless.

沟通渠道是一个至关重要的元素的每个通信系统。这些渠道实际上把数据从一

台计算机到另一个。有两个类别的沟通渠道。一个类别连接发送和接收设备通过

提供一个物理连接导线或电缆等。另一类是无线。

PHYSICAL CONNECTIONS

Physical connections use a solid medium to connect sending and receiving devices.

These connections include telephone lines (twisted pair), coaxial cable,and fiber-optic

cable.

物理连接使用固体介质连接发送和接收设备。这些连接包括电话线路(双绞

线)、同轴电缆和光纤电缆。

Telephone lines you see strung on poles consist of twisted-pair cable,which is made

up of hundreds of copper wires. A single twisted pair culminates in a wall jack into

which you can plug your phone and computer. (See Figure 9-3.) Telephone lines have

been the standard transmission medium for years for both voice and data. However,

they are now being phased out by more technically advanced and reliable

l cable, a high-frequency transmission cable, replaces the multiple wires

of telephone lines with a single solid-copper core. (See Figure 9-4.) In terms of the

number of telephone connections, a coaxial cable has over 80 times the transmission

capacity of twisted l cable is used to deliver television signals as well as to

connect computers in a network..

电话线路你看到两极串在由双绞线,是由数以百计的铜线。一个双绞线的顶端

是一墙杰克,你可以插你的手机和电脑。电话线被标准的传输介质多年的语音和

数据。然而,他们现在被淘汰的技术更先进、可靠的媒体。同轴电缆、高频传输

电缆,取代了多个连接的电话线和一个固体铜核心。在数量方面的电话连接,一个

同轴电缆有超过80倍的双绞线传输容量。同轴电缆是用于提供电视信号以及连接

网络的电脑. .

Fiber-optic cable transmits data as pulses of light through tiny tubes of glass. (See

Figure 9-5.) In terms of the number of telephone connections,fiber-optic cable has

over 26,000 times the transmission capacity of twisted-pair cable. Compared to

coaxial cable, they are lighter and more reliable at transmitting data. They transmit

information using beams of light at light speeds instead of pulses of electricity,

making them far faster than copper cable. Fiber-optic cable is rapidly replacing

twisted-pair cable telephone lines.

光纤电缆传输数据的光脉冲,通过微小的玻璃管。在数量方面的电话连接,光纤

电缆已经超过26000倍的双绞线传输容量。同轴电缆相比,它们更轻和更可靠的传

输数据。他们使用光束传输信息以光的速度而不是的电脉冲,使他们远远快于铜

电缆。光纤电缆正在迅速取代双绞线电缆电话线路。

WIRELESS CONNECTIONS

Wireless connections do not use a solid substance to connect sending and receiving

, they use the air itself. Primary technologies used for wireless

connections are infrared, broadcast radio, microwave, and satellite.

无线连接不使用固体物质连接发送和接收设备。相反,他们使用空气本身。主

要技术用于无线连接红外、广播无线电、微波和卫星。

Infrared uses infrared light waves to communicate over short is

sometimes referred to as line-of-sight communication because the light waves can

only travel in a straight line. This requires that sending and receiving devices must be

in clear view of one another without any obstructions blocking that of the

most common applications is to transfer data and information from a portable device

such as a notebook computer or PDA to a desktop computer.

红外使用红外光波在短距离通信。它有时被称为视距通信因为光波只能以直线

的方式行进。这就要求发送和接收设备必须在清楚彼此的观点没有任何障碍物阻

止这一观点。一个最常见的应用是用来传送数据和信息从一个便携式设备如笔记

本电脑或掌上电脑桌面计算机。

Broadcast radio uses radio signals to communicate with wireless

example, cellular telephones and many Web-enabled devices use broadcast radio to

place telephone calls and/or to connect to the Internet. Some end users connect their

notebook or handheld computers to a cellular telephone to access the Web from

remote locations. Most of these Web-enabled devices follow a standard known as

Wi-FI (wireless fidelity). This wireless standard is widely used to connect computers

to each other and to the Internet.

广播电台使用无线电信号与无线设备。例如,移动电话和许多网络设备使用广

播电台将电话和/或连接到互联网。一些终端用户连接他们的笔记本或者掌上电

脑到移动电话访问网络从远程位置。大多数的这些网络设备遵循一个标准的称为

wi - fi(无线保真度)。这个无线标准被广泛用于连接电脑到对方和因特网。

Microwave communication uses high-frequency radio waves. Like infrared,

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