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Very slow download speed on ADSL copper fixed by changing DSL Modulation to Q.dmt


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  • 3 weeks later...

Rapid degradation of download speed captured during one-hour test period this morning (DSL Modulation set to ADSL2+).




Only solution is to set DSL Modulation to G.dmt.


This is counter-intuitive. Perhaps something to do with 12.5% packet loss on first hop after my router i.e. in the 1 km of copper between my router and the DSLAM in the exchange. Perhaps the 19.8 dBm DSL Transmit Power boost on G.dmt.


Would like to know if other copper users who live > 1 km from DSLAM are also getting very slow download speeds most of the time when DSL Modulation set to ADSL2+ or Multimode but much better download speeds when DSL Modulation set to Q.dmt.

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