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DSL的流行就是因为使用了电话线,是用回波抵消的技术达到高带宽。而且使用的是你的电话线同时跑语音和数据,不需要专用电缆,isdn是一种过时的技术,只有中国电信还拿来骗骗人。

chrisxu (chris)
(#30558@0)
2001-3-5 -04:00
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