Abstract
High speed data transmission systems using metallic telecommunication lines such as xDSL (Digital Subscriber Line) are being introduced into railway systems as a substitute to analog systems where adoption of optical carrier is not cost effective and to supplement optical carrier systems between a station with optical terminal equipment, and a station without optical terminal equipment. Research carried out so far has produced a method for assessing the suitability of coupling high speed data transmission systems for railways with normal-state telecommunication lines. This study proposes an improved evaluation method, which considers the influence of the line disturbances on the electrical characteristics of telecommunication lines, and delay time and jitter when transmission systems are connected in tandem.
