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服务供应商正在把DSL(数字用户线)定为疏通最后一英里瓶颈的最佳选择,并且其价格也可以接受。倾听服务供应商所述,感到DSL听起来象是没有任何缺点的选择,并且创造了最后一英里的奇迹。设备制造商声称,ADSL可以达到1Mbps的上行速率,比起56K要快17倍。这也许是在实验室。在实际情况下,ADSL可以在16Kbps这样低的速率下运行。DSL与其它数据服务之间的接口会使它们同时慢下来。如果你没有处理好它,你的传输线会象管风琴一样发出声响。同时,使DSL运作正常要取决于许多事情,如:要知道埋在地底下电缆的类型,它从CO(中心办公室)延展了多远,在临近的电路中有多少服务已经被提供,HP市场开发经理Thomas
Service providers are making DSL (Digital Subscriber Line) the best choice to clear the bottleneck of the last mile, and the price is acceptable. Listening to service providers, the DSL sounds like an option without any flaws and creates a miracle of the last mile. Device manufacturers claim that ADSL can reach an upstream rate of 1 Mbps, 17 times faster than 56K. This may be in the laboratory. In the real world, ADSL can operate at such a low rate of 16Kbps. The interface between DSL and other data services slows them down at the same time. If you do not handle it well, your transmission line will sound like an organ. At the same time, getting DSL up and running depends on many things, such as knowing what type of cable you are laying underground, how far it extends from the CO (central office), how much service is available in nearby circuits, and the HP market Development Manager Thomas