The speed estimates sometimes are not always accurate and sometimes even underestimate what you'll get!
For example last year when I joined TalkTalk FTTC. Those were my speed estimates.
Featured Products Downstream Line Rate(Mbps) Upstream Line Rate (Mbps) Downstream Handback
Threshold(Mbps) WBC FTTC Availability Date WBC SOGEA Availability Date
High Low High Low
VDSL Range A (Clean) 80 68.2 20 19 62.1 Available Available
VDSL Range B (Impacted) 80 64.8 20 19 56.6 Available Available
The checker was showing 68.2-80Mbps and for Impacted 64.8-80Mbps.
This year, I don't know whether crosstalk reduced the speed estimates. But this is what it shows now. High Low High Low
VDSL Range A (Clean) 80 60 20 15 52.9 Available Available
VDSL Range B (Impacted) 79 54.1 20 12.9 44 Available Available
As you can see, it's pretty big drop 60-80 vs before 68.2-80 and for Impacted 54.1-80Mbps when it was 64.8-80Mbps.
This doesn't seem quite right. Yet, I have synced at 80Mbps download and 20Mbps upload the entire year that I have been with TalkTalk so far!
This year router stats, just now..
Router stats Downstream Upstream
Actual Rate [Kbps] 79999 19999
Maximum Rate [Kbps] 80904 19999
Noise Margin [dB] 2.80 14.80
Attenuation [dB] 18.00 0.00
Last year it was
Downstream Upstream
Actual Rate [Kbps] 80000 19999
Maximum Rate [Kbps] 80534 19999
Noise Margin [dB] 6.40 15.40
Attenuation [dB] 17.90 0.00
Receiving a slightly higher Maximum rate this year in router stats but lower speed estimates in BT Wholesale checker.
Only difference I can see is this drop in noise margins. 2.80 vs 6.40. Maybe that's the reason for the reduced speed estimates. But so far connection is still maintaining stability with the reduced noise margins.
TalkTalk Speed estimates last year vs this year
Your typical download speed:
48.1Mb - 72.1Mb
Your typical upload speed:
13.2Mb - 18.9Mb
We guarantee you a minimum download speed of 39.8Mb
Your typical download speed:
66.2Mb - 73.6Mb
Your typical upload speed:
17Mb - 18Mb
We guarantee you a minimum download speed of 59.6Mb
Very, very bizarre! It is completely off. But I don't really care as long as I'm still getting 80/20 Mbps that's all that matters!