Re: 哪位大哥介绍一下SDL/ASDL?# EE - 电子工程
s*i
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Asymmetrical Digital Subscriber Line
asymmetrical refers to the fact that communications is primarily one way.
That is, the bulk of ADSL communications is from the service provider
the confusing part. There really is no asymmetrical digital subscriber line.
There is a twisted copper pair of lines that is physically connected from the
customer premises to the local office. Only when an ADSL modem is connected
to each end of the subscriber’s line is any such thing as an “asymmetrical
digital subs