《电子信息专业英语 教学课件 ppt 作者 杨泽清 Unit12》由会员分享，可在线阅读，更多相关《电子信息专业英语 教学课件 ppt 作者 杨泽清 Unit12（12页珍藏版）》请在金锄头文库上搜索。
1、Unit 12 A. Text,New Network Technology,New Words and Expressions,collision kE5liVEn n. 碰撞, 冲突 random 5rAndEm adj. 任意的, 随便的 distributed dis5tribju:tid adj. 分布式的 synchronous 5siNkrEnEs adj. 同步的 asynchronous ei5siNkrEnEs adj. 异步的 lease li:s n. v. 租借, 出租,popularity 7pCpju5lAriti n. 普及, 流行 forum 5fC:rEm
2、n. 论坛, 法庭 dedicated 5dedikeitid adj. 独立的,专门的 attribute E5tribju(:)t n. 属性,特征 the large volume of 大量的 as the way to 作为的方法,上页 下页 返回 结束,Technical Terms,random time interval 随机时间间隔 FDDI ( Fibre Distributed Data Interface ) 布式光纤数据接 twisted pair 双绞线 full-motion video 全运动视频 standard leased line 标准租用线 ATM (
3、 Asynchronous Transfer Mode ) 异步传输模 WAN ( Wide Area Network ) 广域网 dedicated bandwidth 独立带宽 the ATM Forum ATM论坛,上页 下页 返回 结束,Notes,1. Most computers will probably be networked in some way, however, running multimedia applications over a network presents new problems, mainly related to the large volume
4、 of data that must be transferred. 大多数计算机都将以某种方式连成网络，然而在网络上运行多媒体应用软件提出了新的问题，主要是关于大量数据的传输问题。 该句为并列句。在后一分句中其主干结构是 running applications presents problems，即动名词短语作主语; mainly related transferred 是过去分词短语做后置定语，其中 data 带一个由 that 引导的定语从句。,2. Ethernet is a “broadcast medium“, so when you send a packet out on t
5、he Ethernet, every machine on the network sees the packet. 以太网是一种广播媒体，所以，当你在以太网上发送一个分组时，网上每个计算机都可以看到分组。 so 引导一个结果状语从句；该从句又含有一个由 when 引导的时间状语从句。 3. If two send at the same time, a collision occurs, and to avoid another collision each machine waits a random time interval before sending again. 当两个计算机同时
6、发送分组时，则会发生碰撞，为了避免发生新的碰撞，每个计算机都在等待一个随机时间间隔后再重新发送分组。 该句为并列复合句。后一分句的主干结构是 each machine waits a random time; 其中 to avoid another collision 是动词不定式短语作目的状语。,4. Integrated Services Digital Network ( ISDN ) is a new service offered by many telephone companies that provides fast, high-capacity digital transmi
7、ssion of voice, data, still images and full-motion video over the worldwide telephone network. 综合业务数字网 ( ISDN ) 是许多电话公司提供的, 在世界范围的电话网上提供语音，数据，静止图像和运动视频的快速，大容量数字传输的一种新业务。 offered by 是过去分词短语，用作定语修饰 service；由 that引导的定语从句修饰 companies；still images 译为：” 静止图像” 。 5. When a connection to send data is setup,
8、the sender specifies various attributes, such as the type and speed of the call. 在建立发送数据的连接时，发送端指定各种属性，如呼叫的类型和速率。 When 引导一个时间状语从句；从句的主语 a connection 带一个不定式短语作后置定语，谓语 is setup 是被动语态。,.Try to match the following columns: 1. Fibre Distributed Data Interface 综合业务数字网 2. Integrated Services Digital Networ
9、k 分布式光纤数据接口 3. multimedia application 随机时间间隔 4. Asynchronous Transfer Mode 标准租用线 5. Wide Area Network 局域网 6. Local Area Network 广域网 7. standard leased line 独立带宽 8. dedicated bandwidth 双绞线 9. random time interval 多媒体应用软件 10. twisted pair 异步传输模式,Exercises,1.分布式光纤数据接口 2.综合业务数字网 3.多媒体应用 4.异步传输模式 5.广域网 6
10、.局域 7.标准租用线 8.独立带宽 9.随机时 10.双绞线,. Translate the following sentences into Chinese, paying special attention to the underlined words:,1. Ethernets can be linked together to form extended networks using devices called bridges and routers. 2. When a space occurs a machine can send a packet. 3. FDDI can
11、use a wide range of physical media such as twisted pair and fibre. 4. Although ISDN is still expensive when compared to a standard line, it is still cheaper than an ATM connection. 5. This means a dedicated bandwidth for each connection, and flexible access speeds.,1.以太网还可以使用网桥和路由器 2.一有空闲，计算机就发送分组。
12、3.FDDI（分布式光纤数据接口）可以用于各种物理媒体，如双绞线和光纤。 4.和标准线路相比，ISDN还是偏贵，但比ATM（异步转移模式）要便宜的多。 5.这就意味着每个连接享有独立的带宽和灵活的访问速度。,B. Reading Internetworking New Words and Expressions internetworking 7intE:net5wE:kiN n. 网际互联 dispersed dis5pE:st adj. 散布的 troubleshooting 5trQbl5Fu:tiN n. 发现并修理故障 flexibility 7fleksE5biliti n. 灵活
13、性, 适应性 disparate 5dispErit adj. 全异的 unpredictable 5Qnpri5diktEbl adj. 不可预知的,Technical Terms,time-sharing network 分时共享网络 SNA ( Systems Net work Architecture )系统网络结构DNA ( Digital Network Architecture ) 数字网络结构,Exercises,Decide whether the following statements are true or false: 1. The first networks we
14、re frequency-sharing networks. 2. LANs enabled multiple users to exchange files and messages. 3. Establishing an efficient and effective internetwork is a simple task. 4. Because internetworks can provide a certain level of reliability, so large internetworks neednt include redundancy. 5. Redundancy is a kind of method to provide more reliable internetworks,F T F F T,
