美国西部公司计划通过有线电视提供电话和上网服务。这项服务实施后,用户不但可以观看电视,还将能从电视屏幕上阅读电子邮件、在Internet上漫游和打电话。要实现这项服务的关键是安装一个机顶盒,它通过普通的电话线或高速的数字线路与美国西部公司的Internet服务器相连。这种机顶 U.S. West companies plan to provide telephone and Internet services over cable television. With this service, users not only watch TV but also read e-mail from the TV screen, roam the Internet and make phone calls. The key to this service is the installation of a set-top box that connects to the Internet servers of companies in the western United States over regular telephone lines or high-speed digital lines. This top of the machine