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

[pillface]

Before (DSL Modulation set to ADSL2+) https://testmy.net/db/9EYvOW8ap

After (DSL Modulation set to G.dmt) https://testmy.net/db/wzZbGM_zC

 

[mudmanc4]

On 12/24/2019 at 4:35 PM, pillface said:

Before (DSL Modulation set to ADSL2+) https://testmy.net/db/9EYvOW8ap

After (DSL Modulation set to G.dmt) https://testmy.net/db/wzZbGM_zC

 

Nice, can you list the modem your using?

[pillface]

Linksys WAG320N

 

[pillface]

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.