DSL Network Guide Chapter 14: ADSL vs. SDSL

There are two versions of DSL on the market, ADSL and SDSL. ADSL is more common for residential service and is much cheaper. SDSL is usually for business accounts and is considerably more expensive.
ADSL stands for Asynchronous Digital Subscriber Line. ADSL lines have different upload and download transfer rates. This would be something like 768kbps download and 128kbps upload. The download is almost always higher than the upload because most home users do a lot more downloading web pages and files then they do uploading. ADSL account usually require a login name and password using PPPoE but most companies also offer static IPs that do not require logging in. The Terms of Service for most ADSL accounts usually do not allow for the hosting of a webpage, mail, or other servers. Because of this ADSL rarely offers upload speeds higher than 128kbps.
SDSL stand for Synchronous Digital Subscriber Line. SDSL upload and download transfer rates are the same. This would be something like 384kbps download and 384kbps upload. SDSL is good for people who are hosting servers or need to remotely upload and download files to their computers while away. SDSL usually doesn't require any type of downloading and usually comes with a static IP. Unlike ADSL, the SDSL Terms of Service does not usualy inhibit one from running any types of servers. Because of this SDSL is usually marketed towards businesses.

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