ATU-R140
The new standards ADSL 2 and ADSL 2+ provide greater reach and higher data rates. The two technologies were developed side by side, and are downwardly compatible with the existing G.992.1 ADSL standard. ADSL 2+ (G.992.5) brings ADSL access to users who until now were located too far from the operator's central office. The increased reach is possible because of new modulation techniques in conjunction with improved error correction through trellis coding.
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CTC Union Technologies Co., Ltd.
6F-3, No.15, LANE 360, Sec.1
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