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早在80年代中期我们就领教了那些不切实际的预言:认为当时所研制的新型高速M0dem已达到理论容许的极限。然而,仅仅几年时间工程师们就又研制出速度更快的Modem,打破了那些所谓的不可改变的物理定律。目前,那些有关利用模拟电话线路与网络连接的方式将被ISDN方式所替代的论调是不是与上述预言如出一辙呢? 有关网络的带宽问题也被过分地夸大了。实际上,大部分用户对利用28.8K-bps Modem与Internet连接的效果是满意的。加之新近开发的56K-bps Modem至少能满足80％的用户的带宽需求。我们应该了解的是,大部分网络终端用户所发出的
As early as the mid-1980s, we learned the unrealistic predictions that the new high-speed M0dem developed at that time had reached the theoretical permissible limit. However, in just a few years engineers have developed faster Modem, breaking the so-called immutable laws of physics. At the moment, are those arguments about using ISDN as an alternative to using analog phone lines to connect to the Internet are not exactly the same as the above predictions? The problem of network bandwidth is also exaggerated. In fact, most users are satisfied with the 28.8K-bps Modem Internet connection. Coupled with the newly developed 56K-bps Modem to meet at least 80% of the user’s bandwidth needs. What we should know is that most of the web end users send out