英语翻译Broadband TelecommunicationsThe developmental process of modern communications can be said to be an evolution to a more direct and natural form of communications.To illustrate:delivering message via a third person was soon replaced by the

英语翻译Broadband TelecommunicationsThe developmental process of modern communications can be said to be an evolution to a more direct and natural form of communications.To illustrate:delivering message via a third person was soon replaced by the
英语翻译
Broadband Telecommunications
The developmental process of modern communications can be said to be an evolution to a more direct and natural form of communications.To illustrate:delivering message via a third person was soon replaced by the mail service,which was subsequently supplemented by the telephone,allowing direct,delay-free conversation between two remote parties.From this perspective,it can easily be predicted that the next evolutionary step following the telephone will be the videophone,which enables a more natural and realistic mode of conversing.Such an evolutionary scenario can also be applied to the field of broadcasting.A purely listening form of broadcasting was inevitably followed by television ,with the added visual dimension,and black-and-white televisions became obsolete with the advent of color televisions.In the same context,ordinary color televisions of today will soon be transformed into high-definition television(HDTV),which can display even more realistic and natural-looking pictures.
Our goal is to provide a broad but detailed description of the technologies fundamental to constructing broadband telecommunication systems.Therefore,the five essential components described in Figure 1,fiber-optic communication technology,synchronous digital transmission,B-ISDN and ATM,high-speed data communication,and broadband video communication services,will form the core contents of the broadband telecommunication system,the background of broadband telecommunications will be reviewed briefly.
The basic technologies underling the communication network will be reviewed first,and then the progress of the telecommunication technologies will be examined in terms of transmission,switching,signaling,packet communication,ISDN,and B-ISDN.Finally,the key technologies essential for the implementation of broadband telecommunication systems will be discussed in reference to optical communication medium,broadband transmission,ATM communication,high-speed data network,and broadband video technologies.
As can be inferred from the examples of videophone and HDTV,the evolution of future communications will be via broadband communication centered around video signals.The associated services make up a diverse set of high-speed and broadband services ranging from video signals.The associated services make up a diverse set of high-speed and broadband services ranging from video services such as videophone,video conferencing,video surveillance,cable television(CATV) distribution,and HDTV distribution to the high-speed data services such as high-resolution image transmission,high-speed data transmission,and color facsimile.

英语翻译Broadband TelecommunicationsThe developmental process of modern communications can be said to be an evolution to a more direct and natural form of communications.To illustrate:delivering message via a third person was soon replaced by the
宽带通信
现代通信技术可以说是向着一个更直接更有效的通信模式方向发展.比如说：以前要经过三个人手的寄信方式先被E-mail给取代了,最后又被能够在间隔很远的两个地方人之间进行更直接、更快交谈的电话所取代；从这个角度来看,可以很容易的预言,电话进一步的发展就是可视电话,它可以提供更多实用和现实的会话.这种演化的形式在广播领域也是适用的.那种纯粹是听觉效果的广播不可避免的要被带有视觉效果的电视所代替,并且随着彩色电视机的发展,黑白电视机已经逐渐报废了.同样的,彩色电视机也将被能提供更现实和更真实视觉图片的高清电视所取代.我们的目标是建立一个具有宽带的、对基本技术又详细描述的宽带电信系统.因此,在图一中给出了5个组成要点：光通信技术、同步数字传输系统、宽带数字综合业务网和异步传输模式、高速率数据传输、宽带视频通信服务,它们是宽带电信系统的核心部分,简单的说背景和宽带电信将会被检查.
首先要检查的是电信网络的基础技术部分,像信号的传输、转换、发送、打包、综合服务数字网、宽带综合服务数字网.最后,再讨论宽带电信系统的关键技术,像光通信的传输介质、宽带传输、异步传输模式、高速率数据网络和宽带视频技术.
从可视电话和高清电视演化的例子中,我们可以推出,未来通信技术将通过围绕视频信号的宽带电信来进行.这种联合服务组成各种以视频形式的高速率、宽带服务形式,像可视电话、视频会议、视频监控、有线电视信号分配、高清电视信号分配