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Large difference between Data Rate and Max Data Rate

iryder — Wed, 30 Dec 2020 16:46:07 GMT

Hi,

I have 80Mb Fibre broadband. When I first moved into my house the power was taken down several times due to renovations work and I think this caused my IP Profile to rate limit my line due to multiple 'drops' of the connection.

Focusing on down stream speeds, when I look at my BT Home Hub, I see if have a Maximum Data Rate of 57 Mb, however my Data Rate is at 44 Mb. If I look at the BTW Performance Tester I see my IP Profile is set to 42.58Mb.

My DSL uptime is over 14 days, should my IP Profile be updating?

Re: Large difference between Data Rate and Max Data Rate

imjolly — Wed, 30 Dec 2020 17:33:09 GMT

If you had multiple disconnections as your home was renovated then it looks like that has resulted in DLM taking action to try and stabilise your line resulting in a banded profile - increased noise margin and reduced speed

unlike adsl it takes longer for DLM to start to release the banding and just you to maintain a stable connection

enter your phone number and post results

https://www.broadbandchecker.btwholesale.com/#/ADSL

Re: Large difference between Data Rate and Max Data Rate

iryder — Wed, 30 Dec 2020 17:40:15 GMT

It has been several months since my power interruptions. Results attached, not sure if it's because I'm getting speeds near the low end but within range, but feels like I should be able to be getting in the 50's...

Re: Large difference between Data Rate and Max Data Rate

imjolly — Wed, 30 Dec 2020 17:48:10 GMT

Your connection the is 14 days is that due to hub dropping connection or manual reset? From other posts it usually takes longer for banding to release

from checker your connection speed is still within your expected range and above handback so difficult to get BT to help

Re: Large difference between Data Rate and Max Data Rate

iryder — Wed, 30 Dec 2020 17:55:42 GMT

I believe the last reset was due to a power cut in the local area. Was worried that might be the case, i.e. within acceptable range (although potentially not the optimal speed).

Re: Large difference between Data Rate and Max Data Rate

j0hn83 — Fri, 01 Jan 2021 15:32:23 GMT

The line is capped/banded at 44Mb by the DLM but that's not the main reason for the inflated maximum data rate.

The noise margin suggests the line would only sync a little above the current cap, probably around 45Mb.

Interleaving is almost certainly applied to the line which exaggerates the maximum data rate.

It's normal.

The Interleaving suggests you're connected to an ECI cabinet.

In short, the line wouldn't sync anywhere near the maximum data rate reported, even if it wasn't capped.

Re: Large difference between Data Rate and Max Data Rate

pippincp — Fri, 01 Jan 2021 19:04:11 GMT

@j0hn83 No suggestion about it, the OP is connected to an ECI cab.