因为连接用户与Central Office的电话线是"twisted line"。这种电话线当初只是用来传递3千赫兹的音频信号。虽然它也能传递频率更高的信号,但由于"twisted line"的电容效应,高频信号随着距离增加会迅速衰减。Central Office距离越远,DSL的速度就越慢。
因为连接用户与Central Office的电话线是"twisted line"。这种电话线当初只是用来传递3千赫兹的音频信号。虽然它也能传递频率更高的信号,但由于"twisted line"的电容效应,高频信号随着距离增加会迅速衰减。Central Office距离越远,DSL的速度就越慢。
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