DSL Advances

3.8. ADSL2 Summary

The following summary of the new aspects of the second generation ITU ADSL Recommendations G.992.3 and G.992.4 (2002) is adapted from information provided by Frank Van der Putten, the ITU Associate Rapporteur for G.992.3.

3.8.1. Improved Performance

ADSL2 increases the bit-rate and line-reach performance of ADSL, enabling up to 256 kb/s of additional performance on typical lines. A further increase in performance is possible when using the all-digital mode described in Section 3.8.7 in combination with the enhancements described here. The specifications now address bit rates up to 8 Mbit/s downstream and 800 kb/s upstream. An emerging ADSL standard can be scaled up to 15 Mbit/s downstream and 1.5 Mb/s upstream (on short lines). ...