计算机专业英语第九章部分翻译(3)

formation is intended for it.

在总线网络每个设备在网络中处理它自己的通信控制。没有主机。所有通信沿着一个共同的连接电缆称为总线或骨干。随着信息形成适用于它。

The bus network is typically used when only a few microcomputers are to be linked together.This arrangement is common for sharing data stored on different microcomputers. Because a star network typically provides a more direct path to shared resources,it is more efficient than a bus network for sharing these resources.However, a bus network is easy to install and is less expensive.

总线网络通常用在当只有很少的微机都联系到一起。这样的安排是常见的共享数据存储在不同的微型计算机。因为一个星形网络通常提供了一个更直接的路径共享资源,它是更有效的比一个总线网络共享这些资源。然而,一个总线网络易于安装和不昂贵的。

In a ring network, each device is connected to two other devices, forming a ring.(See Figure 9-20.) There is no central file server or computer. Messages are passed around the ring until they reach the correct destination. With microcomputers, the ring arrangement is the least frequently used of the four networks. However, it often is used to link mainframes, especially over wide geographical areas. These mainframes tend to operate fairly autonomously. They perform most or all of their own processing and only occasionally share data and programs with other mainframes.

在一个环网络,每个设备被连接到其他两个设备,形成一个环。没有中央文件服务器或计算机。消息被传递在环直到他们到达正确的目的地。用微型计算机,戒指的安排是最常用的四种网络。然而,它通常是用来连接主机,尤其是在广泛的地理区域。这些大型机往往相当独立地运作。他们表演的大多数或所有他们自己处理,只有偶尔分享数据和程序与其他主机。

A ring network is useful in a decentralized organization because it makes possible a distributed data processing system. That is,computers can perform processing tasks at their own dispersed locations,However, they also can share programs, data,and other resources with each other.

一个环网络是有用的在一个分散的组织,因为它使可能的分布式数据处理系统。那是,电脑可以执行处理任务在自己的分散的位置,然而,他们也可以共享程序、数据和其他资源,与对方。

The hierarchical network consists of several computers linked to a central host computer, just like a star network. However, these other computers are also hosts to

other, smaller computers or to peripheral devices. (See Figure 9-21.)

层次网络由多个计算机连接到一个中央主机电脑,就像一个星形网络。然而,这些其他的电脑也主机,其它的小电脑或外围设备。

Thus, the host at the top of the hierarchy could be a mainframe. The computers below the mainframe could be minicomputers, and those below, microcomputers. The hierarchical network allows various computers to share databases, processing power, and different output devices.

因此,主持人最高等级的可以是一个主机。下面的电脑主机可以小型机,下面,微型计算机。层次网络允许各种电脑共享数据库、处理能力和不同输出设备。

A hierarchical network is useful in centralized organizations. For example,different departments within an organization may have individual microcomputers connected to departmental minicomputers. The minicomputers in turn may be connected to the corporation's mainframe, which contains data and programs accessible to all. 一个层次网络是有用的在集中组织。例如,不同的部门在一个组织中可能存在个人微型计算机连接到部门的小型计算机。小型机的反过来又可以连接到公司的主机,它包含数据和程序都可接受。

For a summary of the network configurations, see Figure 9-22. 对于一个总结的网络配置,见图9-22。

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