宽带用户环路系统将为可视电话、视频娱乐节目等业务提供通路。
The wideband subscriber loop system provides access to services such as picturephone, video entertainment.
它必须足够大以适应所有用户的内存映像复制份数，并且他必须提供直的通路以适应这些内存映像。
It must be large enough to accommodate copies of all memory images for all users, and it must provide direct access to these memory images.
基于这一需求WAP协议被制定出来，它可以提供用户接入信息系统的双向通路。
WAP protocol is designed to suit to this requirement. It provides two accesses for switching into information system.
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