'High' and 'Low' on the BT checker

Looking at the DSL checker for my line it reports speeds attainable of 80 'high' to 58.6 'low' (for a clean line) and 68.6 to 42.1 for an impacted line.

FWIW I have 60 down, but I was wondering what impacts on a clean line to vary the speed? Naturally I have no idea if my line is clean or impacted but even if impacted shouldn't I get near on 68.6? or is 60 near on 68.6?!

Also what (at the foot of the table) are Bridge Tap, VRI and NTEFaceplate. All of which report "N" for no I guess.

Not moaning, just wondering

A clean line - in the perfect case will be from the cabinet to you without any joints. The system will know your approximate line length and will base the estimates on that. The factors which will then affect the potential speed on a clean line include: actual line length, gauge of copper used, external noise sources, other users in the same multi-pair cable and the proximity to you, the actual quality and impedance of the modem at your end and more. They will have a cumulative effect on the overall speed you can get.

Impacted: Again several things which will cause a line to be impacted; bridge taps, bad quality wiring at some point which could be in your premises, localised high energy noise/interferer ...

And finally - no you should not be getting near 68.6 even if your line is impacted - you could still get as low as the estimated 42.1

Further to what MHC says, do you have any stats for your current set up ....

And how is it all hooked up in your house .....

despite it having an N for bridge tap, these are the most likely cause for less than expected sync rate.

Like this from my router?
Done my best to format it! <- oh well, never mind...


Receive Direction Send Direction
Max. DSLAM throughput kbit/s 80000 20000
Min. DSLAM throughput kbit/s 128 128
Attainable throughput kbit/s 60115 20050
Current throughput kbit/s 60115 19797
Seamless rate adaptation off off

Latency fast fast
Impulse Noise Protection (INP) 0 0
G.INP off off

Signal-to-noise ratio dB 6 6
Bitswap on on
Line attenuation dB 17 20

Profile 17a
G.Vector off off

Carrier record A43 A43

Which router is this?

Which cabinet are you connected to, ECI or Huawei?

I note G.INP is off.

Hmm, no clues to be had there especially ...

What of the set up please ?

For 17 dB line the upstream with an attainable of just over 20 and actual just under is about right - maybe just a little low. the downstream is quite a bit lower that I would expect - it should be up in the high 60s to mid 70s and with a 6dB SNR, I would be thinking that there is a significant noise source affecting a block of downstream tones. Some plots from DSL stats may show something.

Router: FritzBox! 7490

Cab type: Does Infineon 11.8.6 help?

Exchange POLLOK served by Cabinet 9

What should I know about G.INP

No complaints about the speed or service here BTW, but it helps compare and contrast possible speeds at other locations.

Stats

https://imgur.com/a/yaBFv

.... But still no description of the set up at yours .....