E-DSL - is permanent unlimited access to the Internet for customers TPSA, based on ADSL technology. This technology is a kind of widely used DSL technologies. Thanks to this technology it is possible asymmetric access to the Internet. In this case the asymmetry is that the transmission of data to the user (from the Internet) is faster than the reverse transmission. This technology was developed for users who more often receive some data (for example, from web-sites), than send them (for example, who have a web-server).