Digital subscriber line (,, el) or (DSL) from Category technology such that the transfer of telecommunications information data by wire communication in a Network call, the local provides. (DSL)digital subscriber line is a branch of technology, that the information through the network, cable, local telephone transmission. DSL first, for a ring Communication Digital was formed. In market positioning, radio communications, the term DSL means digital subscriber line, asymmetrical (ADSL) understandable and known, which is the most common way is to use DSL technology. Services DSL through a regular phone line, simultaneously with the sound, is applicable. This applies to the reason for this is that DSL technology, the frequency higher than the voice usage does result in interference between the digital information and voice, and it won't matter. The speed of data transfer using a protocol DSL typically of 256 kilo bits per second up to 40 mega bits per second, depending on the type of DSL technology conditions, telephone lines, and the level of service provider. In ADSL can transmit data in the reverse direction, i.e., send less of Download is from the ADSL), digital subscriber line, asymmetrical (reincarnated in the digital subscriber line symmetric (SDSL) download and upload speed (data transfer rate in the direction of upload and download) is equal to.