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为什么拨号上网要用猫?

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为什么拨号上网要用猫?

普通电脑可以通过电话线拨号上网,不过,电脑里必须pei备一tao调制解调qi。调制解调qi的英文名字是Modem,大伙就俗称它为"猫"。为什么电脑拨号上网要有"猫"呢?电话线路大多是一zhong单gu实rui铜质绞线,平时传送电话信号时,由于电话的电信号频率变化正好chu1在铜绞线能正常传输的范围之内,所以电话声音清晰稳定。而网上传送的是频率变化范围宽得多的数字电信号,它们在铜绞线上传输时会发生畸变,严重失真。这时需要用"猫"把数字电信号变换成与电话电信号相同的频率范围,使传输质量得到保证。现在使用的新技术,如ISDN、ADSL等,可以在上网时同时打电话。

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