ADSL2 is the successor to ADSL.

Rough notes for now. Differences include:

  • Different modulation. ADSL2 uses a "16-state trellis filter and 1-bit QAM constellation" to improve datarates on high SNR links
  • Variable length framing information, which can be used to reduce overhead in low-performance (<128kbit) connections
  • Seamless power cutback. ADSl2 makes use of different power levels to reduce noise and crosstalk
  • Line bonding for higher datarates