Ok I just did the test, which involved plugging in the Home Hub using the supplied power cable and then connecting it to the filter via a new ADSL cable which we got from Tesco (not the same one used on the TG582n). Stats are below (entered manually by me from a screenshot):
Bandwidth: 448Kbps up, 5,664Kbps down
Output Power: 11.5db up, 9.5db down
Line Attenuation: 5.0db up, 7.0db down
SN Margin: 22.0db up, 9.5db down
(When I did this test it was raining outside, however now I have reconnected my normal router, I am getting 6,880Kbps down, so I don't think weather could have caused the low sync)
Most likely the low sync was caused by this Home Hub being an old router, you think?
Now back to the seemingly age old question of what on earth is causing the underperformance
I had a wild idea today: I could plug our old extension back in, then move the router upstairs and plug it in up there, this would help to eliminate any noise issues as it would be in a different room altogether, with nothing else plugged in to the mains in that room.
@XRaySpeX Earlier in the thread you said I am already on WBC, how did you work that out?
Why bother wasting money and space keeping 2 varieties of kit when you can cover both with just the modern kit and just throwing a few software switches?
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC