在HFC网络系统结构中，局端系统CMTS完成数据到(13)信号的转换，它也可作为业务接入设备，通过以太网挂接本地服务器，提供本地业务。Cable MODEM接收到的以太帧被封装在某一时隙中，经(14)调制后，通过HFC网络的上行信道传送给CMTS。通常用户连入Internet不需要拨号，一般用户计算机采用(15)地址上网。

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Although the bulk of industry resources and energies have focused on developing the fastest(71)or slickest(72)more and more mindshare is turning to the evolution of the computer interface. Advancements in the areas of input devices,(73)processing and vitual reality could lead to fundamental changes in the way human and computer interact. The technological battlefield of the future will be adding layers between the user and the raw machine to make the(74)as invisible as possible.(75)represents the next evolutionary step for the interface.

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WAP uses(66)which includes the Handheld Device Markup Language(HDML)developed by Phone.com. WML can also trace its roots to eXtensible Markup Language(XML). A markup language is a way of adding information to your(67)that tells the device receiving the content what to do with it. The best known markup language is Hypertext Markup Language.(68)HTML, WML is considered a meta. language. Basically, this means that in addition to providing predefined(69), WML lets you design your own markup language(70). WAP also allows the use of standard Internet protocols such as UDP, IP and XML.