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[Dray]

That was 5 months ago. When did you re-contract?

[BobR]

Dray, recently - 24 November: but I run a speedtest periodically and if there's no meaningful change to the results I have no reason to run DSLstats hence the old data. What I can tell you is that prior to re-contracting I was getting consistent results around 50/10Mbps - any deviations from that were so minor as to not cause concern.

[Dray]

Pity you stopped running dslstats, that could show when the problem began. Looks like your speed has been capped due to disconnections

[BobR]

Hmmm that's a point: my router is powered on all the time but there have been electricity supply dropouts. None in the period between re-contracting and now though.

If, as you say, the speed is "being capped" are you referring to the DLM response to such disconnections?

[Dray]

Yes. If the line becomes stable your speed will recover

[ejs]

The historic line stats suggest that even the 50/10 speedtest results were indicative of some sort of problem, perhaps banded at a slightly higher rate.

What are the estimated speeds for the line?

[BobR]

OK thanks for that.

And as regards 'banding" is that same as the "profile"? Who are what chooses what I believe is called "the workplace profile".

Sorry for all the questions but I do appreciate your responses.

[BobR]

ejs: from Plusnet website

Estimated line speed:
    40Mb (This may vary between 35Mb and 49Mb) - Checked on 2017-11-24 16:44:36
Current line speed:
    55 Mb

[kitz]

Hi

It does indeed look like the line is banded at 49 Mbps - the giveaway is 48998 and your having an SNRM of 16dB.
From the stats provided it also looks like your line has Interleaving applied.   This means that your maximum attainable rate of 67432 kbps will be over-estimated. 

As such that in turn leaves me to conclude that the line currently is not capable of attaining 72Mbps - it has probably lost some speed due to a cross-talker for which nothing can be done.

However..  there is still a lot more speed in your line if it wasn't for the DLM cap.   Your line could have been banded before you moved to Plusnet as whilst Interleaving may be reset,  DLM banding can sometimes follow between an ISP move. 

[kitz]

@BobR

The estimated speed ejs was looking for is from here :-
https://www.btwholesale.com/includes/adsl/adsl.htm?s_cid=ws_furls_adslchecker

If you attach the results - make sure you remove your phone no and any other personal identifying information

[BobR]

Hello Kitz and thanks for those comments. But I haven't recently moved to PN I've been with them for a while. I was out of contract and had just, belatedly, got round to doing something about it.

Last I heard from PN was an email dated 30 June 2016 that as of 01 August 2016 my line speed limits would be 52/9.4Mb.

Periodic speedtests were consistent with that until now.

[ejs]

@kitz
It's got G.INP and the interleaving depth is 4 (negligible, it's just done so that the interleaving covers one DTU), plus it also has vectoring so crosstalk shouldn't be much of a problem.

[BobR]

To respond to Kitz point: the BT line checker gives high/low downstream values of 49/35.

[kitz]

apols - I misread re-contracted 

[ejs]

So this was originally a Plusnet 40/20 connection (provisioned on 80/20 with the download speed capped at 40 by Plusnet), which they should have changed to 55/10, but it appears to still be provisioned on 80/20.

And I'm assuming you re-contracted for Unlimited Fibre and not Unlimited Fibre Extra?