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在中国,双绞铜线,也就是我们常说的电话线在终端接入线中的比例高达93％。随着中国互联网用户数的急剧增加,对接入带宽的要求正在迅速增长,国内的电信运营商正面临着满足接入带宽、提供更多宽带服务的压力。而DSL——利用普通双绞电话铜线在不影响窄带话音业务的情况下,可以提供高速数据传输业务——已经成为一项非常有希望的接入技术。特别是作为接入容量扩充的一种非常经济、行之有效的接入形式,非常适合中国国情,因此,随着DSL
In China, twisted-pair copper wire, that is, we often say that the proportion of telephone lines in the terminal access line up to 93%. With the rapid increase in the number of Internet users in China, the demand for access bandwidth is rapidly growing. Domestic telecom operators are facing the pressure of satisfying access bandwidth and providing more broadband services. The DSL - the use of ordinary twisted-pair telephone copper without affecting the narrow-band voice services, can provide high-speed data transmission services - has become a very promising access technology. Especially as a very economical and effective access form for access capacity expansion, it is very suitable for China’s national conditions. Therefore, with the DSL