High bit rate digital subscriber line

Abstract

Digital Subscribe Line (DSL) technology allows transmission of digital data at speed of 1-5 Mbps over normal, unconditioned copper phone lines. This technology is used to host broadband communication and among this xDSL technology is a mature High bit rate DSL (HDSL) technology. HDSL allows transmission of data of 1.544/2.048 Mbps up to a distance of 5-6 km over copper phone line. The goal of the project is to develop a basic platform and hardware design for further research work. Modular approach is adopted for designing because it is easy to implement and understand. The modules are designed and simulated considering the practical requirements yet there are limitations of the software used. The dissertation discusses E1 being decoded into bitstream and than converted to two-bit one-quaternary (2B1Q) line code to enable E1 to pass on copper pair at the receiver end the signal is decoded from 2B1Q format and than encoded back to E1 standard high density bipolar order 3 (HDB3) format. Our main project report will reflect the major design portion in the form of HDB3 Codec and 2B1Q Codec but it also covers the simulations, PCB designs of the modules and auxiliary circuits required during the course of project.