A few replies:

www - My apologies, I should have made it clear at post #1 that I was NOT looking for more than 40 which is my 'contract'. Plusnet did a lot of work resulting in a move 'at the exchange' due to 'a hot line' but I was expecting much closer to 40. What EXACTLY are the meanings of 'sync speed' and 'max attainable' when it comes to what one gets?

eckiedoo - cannot see what line length has to do given the router stats?

Batboy - Homeplugs are disconnected for the test - see
"This speedtest is via a Homeplug but is pretty similar to the results of a direct wiring to the router."

My Downstream attenuation on a 300 M line is 13.6 db, compared to your 20.4 db, so indicating that your phone line distance is almost certainly greater than mine; and generally in line with your estimate.

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My Downstream "NOISE MARGIN" is 12.8 dbm.

As apparently there are two different ways of measuring Noise generally, I am not sure how this compares with your "20.4".

But I very rarely encounter problems of slowness etc, so my line is clearly working well.

Edited by deleted (Mon 04-Jul-16 09:56:12)

The longer the line, the greater the losses generally; and also the greater possibilities of noise pick-up, requiring message packets having to be repeated, so extending the time needed to build up a complete accurate message.

The line losses are effectively "uncontrollable", as they are conforming to the fundamental laws of physics.

However, the better the quality of the line, those losses can be reduced, such as ensuring the line is "quiet".

Some of the router stats are not directly "actual performance" stats; but are directly related to the contract.

This is also the source of the "up to" phrase.

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If a truck does 80 MPH on a motorway, there is a greater chance of the goods being damaged on arrival, so a request has to be sent to the supplier, to send replacements, thus taking a longer time for the recipient to get an unbroken item.

Hitting a pot-hole in the road could be compared with noise on the line; or a bad joint.

Heavy traffic on the "70 MPH" motorway, reducing the effective speed and causes congestion, as does "heavy traffic" on the Web/Internet.


Thus because of the extra time, the whole transaction appears to be slower.

There is no 'up to' in my query, but you are saying that sync speed and 'max attainable' figures form the router effectively bear no relation (other than a limit) to delivered speeds?

Using what data, then, how does the BT checker establish that my line is performing below 'spec', which it is, according to BT Wholesale.

Which of my published stats "are directly related to the contract."?

Line checked as 'quiet'.

The "up to" is frequently buried in the Terms and Conditions; and I can not recollect them being mentioned when I have progressively upgraded.

There has been quite a lot of controversy about "up to" involving such bodies as OFCOM and ASA.

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If the figures on the router are exact as on contract, eg 40/10 or very close to that,eg 39,999 Kbps/ 9999 Kbps as appears on my router, they are most unlikely to be measured figures; but pre-sets based on the contract.

Although not included in the router, there are low level figures, below which it is accepted that the performance is below acceptable limits, which you could withdraw from the contract if you regularly get those low levels.

This appears to be the situation that BTW has identified.

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I don't know precisely how BTW measures those conditions - perhaps someone with that knowledge could enlighten us?

Those low-level figures are surprisingly low, from what I have read on other TBB threads.

eckiedoo - not really relevant to this query, I fear? There is no question of any 'up to' in my query. 'Stats' posted (above) were
"Sync Speed 48998
Max Attainable Speed Varies - around 54-58
Attenuations 20.4 down 0 up
SNR. 7.6 down 6.1 up "

- no reference I can see to any contract speeds?

BTW 'identified' the line as performing BELOW the 'green' band which was, I think, around the 38 mark, no mention of any 'contract' speeds in the BTW response. It was because the line 'failed' I was moved lines. .

My question is what can be deduced from the router figures other than max values and what could be causing the loss.

Back to fundamentals such as line length, which you should try to measure "accurately", such as Google Earth - the narrow rectangular upright icon, resembling a ruler or measuring stick.

Apart from the measurement units, eg yards, meters etc, you probably need to use the Path facility, which adds up consective segments.

Knowing that length with a round about 10% accuracy, will help determine the likely performance.

The longer the line, the greater the resistance, inductance and capacitance losses, leading to slower performance.

Super BRoadband, VDSL, is much more affected by those factors than ADSL.

And as I have indicated before, my own line "wanders afar" before coming to rest at my house.

My house is literally the nearest to the FTTC/VDSL source, and in the second-nearest group to the PCP, yet other groups within the estate, clearly further away by conventional geography, are listed as getting faster performance on VDSL.

Unfortunately nobody else on the estate uses the TBB Speed Test, so it is difficult to prove in practice.

Judging by the very few results in the adjacent areas, my speeds are very good; the TBB Test assuring me that is "faster than the average in Scotland"

Try this-
http://www.thinkbroadband.com/speedtest/results.html...

"Knowing that length with a round about 10% accuracy, will help determine the likely performance." - that is 6-700m as posted. Call that 650 +/- 8%?

I am puzzled by your replies. I would have thought that sync rate and max attainable would be affected by line length? If so, why is line length relevant?

In reply to a post by mikejp:

What EXACTLY are the meanings of 'sync speed' and 'max attainable' when it comes to what one gets?

As you are with Plusnet What do you get when you look here? ... Plusnet Current Line speed In mine it show 77Mb Most speedtests I have done (via WiFi) have me at around 72-74Mb/s, I sometimes see 75Mb. That current line speed is what Plusnet use and from Plusnets own........

What does "Current line speed" mean?

The speed shown above is based on your sync speed. This is always a little higher than the speed at which data will actually be downloaded over your broadband connection.

Ta, 69 - that doesn't really shine any light on the issue, I'm afraid. My 'Line Speed' is 40 (my contract).

From what I understand, that is what I should be getting and BT are close in expectation.

It is where the loss is occurring I am trying to establish. As I said, PN did their best but could not push me above current (and talking ££'engineer visit'££, when I am convinced the problem lies outside my property.)