| dc.description.abstract | Recently with the wide wideband network demand is heightened in recent years, the advancing by leaps and bounds of complex software and hardware technology , network service supplier (Internet Service Provider, ISP) Have already used the optic fiber to the building (Fiber To The Building, FTTB) successively in the fetching of the wide band network ,Under the original digital subscriber loop（DSL）, can introduce another services as the image, communication etc. In order to accord with these demand, and that optic fiber is with high costs and not general in DSL, so the first generation asymmetry ADSL( Asymmetric Digital Subscriber Loop, ADSL) of technology to break out will be studying is the direction probed into in recent years.
So the standard organization of international telecommunications (ITU-T) it is already asymmetry when it work out the second generation of DSL ADSL2 and the third generation of DSL ADSL2 +, point to improve to old ADSL issue, ADSL2+ fit on original ADSL structure, and use more elasticity except several more than customers supporting it.
So the thesis carries on the discussion to the real site environment on ADSL series, from telecommunication provider in the office end (Digital Subscriber Loop Access Multiplexers, DSLAM) to the user end, how to raise on the signal noise rate(SNR) quality of circuit line and study with reducing the decaying value, and also use Remote Digital Subscriber Loop Access Multiplexer( Remote DSLAM) far construction circuit support load with way, as to the thing that remote in the area and exchange the border area of serving area of offices, because the distance of the loop is too long, it is unable to offer the predicament of the wide-band network, using the thesis to improve and go beyond the speed of line rate to support the way of service range containing distance, offer a high-speed solution of internet. | en_US |