text: what is the diffrence between leased line and "dsl" in refrence to computer netwrkng? i wanna know the diffrence between "how dsl" works is that same as leased lines dsl ie digital subscribers line . ihow is that diffrent frm adsl in working. digital subscriber line, or dsl, is a family of technologies that provide digital data transmission over the wires used in the "last mile" of a local telephone network. typically, the download speed of dsl ranges from 128 kilobits per second (kbit/s) to 24,000 kbit/s depending on dsl technology and service level implemented. upload speed is lower than download speed for adsl and symmetrical for sdsl.  a leased line is a (usually) symmetric telecommunications line connecting two locations together. unlike traditional pstn lines they do not have a telephone number, each side of the line being permanently connected to the other. they can be used for telephone, data or internet services.