Spectrum Management of DSL Systems in Japan

Abstract

Abstract-The Japanese broadband market is maturing due to expansion in the needs for richer IT lifestyles with higher bit rate access. DSL technologies have played an important role in such growth because of their lower cost and ease of deployment. In order to expand the coverage area and compete with faster services such as FTTH, the DSL family of technologies is diversifying, and there are various services on the market currently in Japan. It is very important to manage those different kinds of systems in order to minimize interference due to crosstalk. This paper describes the Japanese spectrum management standard put into effect this year.

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“…One notable approach of realizing higher speed access being adopted by DSL service providers is bandwidth expansion. On the other hand, the approach may result in crosstalk that can subsequently cause interference in the system [129,130]. Therefore, in DSL networks, the major impediment to performance improvement is the electromagnetic interference between different lines of a cable bundle being produced by the electrical energy carried by the individual line [129][130][131].…”

“…Therefore, improved data rates can be realized by eliminating the FEXT interference [7,131,132]. In general, the crosstalk can be effectively addressed through proper Spectrum Management (SM) [7,[129][130][131]. Static SM (SSM) is the basic form of SM that can be employed; however, its implementation is based on the assumption of a worst-case scenario for all users, which is not ideal.…”