Symmetric Digital Subscriber Line (SDSL) is a Digital Subscriber Line (DSL) variant with T1/E1-like data rates (72 to 2320 kbit/s). It runs over one pair of copper wires, with a maximum range of about 3 kilometers or 1.86 miles. The main difference between ADSL and SDSL is that SDSL has the same upstream data rate as downstream (symmetrical), whereas ADSL always has smaller upstream bandwidth (asymmetrical). However, unlike ADSL, it can't co-exist with a conventional voice service on the same pair as it takes over the entire bandwidth.
SDSL is much more expensive than ADSL, due to its great power it has for businesses requiring self hosting and faster upload speeds to servers.
SDSL
