Also see our Fast guide to DSL.
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CDSL (Consumer Digital Subscriber Line) is a version of Digital Subscriber Line (DSL) service, trademarked by Rockwell Corp., that is somewhat slower than Asymmetric DSL (ADSL) - up to 1 Mbps downstream, probably less upstream - and has the advantage that a splitter does not need to be installed at the user's end. Rockwell no longer provides information about CDSL at its Web site and it does not appear to be marketing it.