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DSL Digital Subscriber Line Downstream
bits/s Upstream
bits/s Notes
ADSL Asymmetric DSL up to 8m up to 1m The most common DSL technology. Downstream speed is higher than upstream speed.
RADSL Rate adaptive Asymmetric DSL up to 7m up to 1m ADSL that adjusts dynamically to varying lengths and quality of access lines.
UADSL Universal Asymmetric DSL up to 1.5m up to 512k ADSL with no need for a phone line splitter.
SDSL Symmetric DSL up to 2m up to 2m Same upstream and downstream speed. Can't share the line with voice communication.
HDSL High bit rate DSL 1.544m 1.544m Used for years as the basis for T1 lines. Requires 2 pairs of wire.
VDSL Very high bit rate DSL up to 51.64m up to 19.2m Still in development. Can be asymmetric or symmetric. Highest speeds at short distance only
IDSL ISDN DSL 128k 128k Can reach farther distances than ADSL or SDSL. Unlike true ISDN, it's only for data.
Cable length Max Downstream
to 9,000 ft 8.5 mbit/s
...12,000 ft 6.3 mbit/s
...16,000 ft 2.0 mbit/s
...18,000 ft 1.5 mbit/s
...22,000 ft RADSL or IDSL only
22,000 + ft IDSL only