An Analysis of Speed Drop in ADSL Lines in Sri Lanka

Abstract

This paper investigates the possible reasons for the very common problem faced by internet users at present: speed drop in ADSL lines in Sri Lanka. ADSL is a variant of DSL in which unused bandwidth of existing copper cable network is taken into used to provide high speed data. ADSL has a high data rate downlink and is low in the uplink. Although ADSL has ability of selfadjusting towards channel conditions still speed drop has its own reasons. Line conditions, distances from base switching station to home premises are few such. Using fiber optic cables is the most popular and decent solution though it is not practical in Sri Lankan scenario. This paper analyzes international ADSL standards, implementation and architecture with which the Sri Lankan concept is compared. Analysis then follows toward identifying the reasons for the speed drop, in order to minimize flaws in the system to provide an increased data rate.