Mea Culpa!
User Error!

Remembered the reps instructions.
Before you try anything power down the router then power down the OR Modem
then
Power up the OR modem until you get solid DSL light THEN
Power up the PN Router

Then test..

I'm back at approx. 35 Mbps

http://www.thinkbroadband.com/speedtest/results.html...

Thanks to you all for taking time to help. Much appreciated

I just posted success before reading this advice and retrospectively you were spot on.
Thank You

Coming up to 10 days since Plusnet FTTC install and trying to squeeze whatever can yet be squeezed from my new fibre broadband connection, is there any way that the IP Profile values BTW 38.71 and PN 37, if increased could improve on my average 35Mbps Down and 1.82 Mbps Up speeds from the speed tests I have completed. Or are these figures [35 / 1.82] the max achievable?
For example if PN upped the IPprofile to 38.71 would I squeeze a bit more?
I�m just trying to get as much as poss. During this 10 day period as I guess I will be living with the result from here on.

Whatever BT Wholesale or ISP reps say, there is no 10-day "training" period on FTTC. I suppose BTW may still stupidly record the lowest connection speed in that period and set an FTR from it, which is all that happened in the first 10 days on ADSLx anyway. It's a big myth.

As for higher speed, on FTTC the IP Profile is 0.9679 times the connection speed if not on G.INP, and 0.9669 times it if it is on. The Plusnet Current line speed as recently as two months ago I believe with your IP Profile of 38.71 would correctly be 38.5. The rep setting it to 37 has almost certainly prevented that happening. 38.71 looks to be the maximum on the 40Mbps product as it will be sync'ing 1 or 2 Mbps below 40,000.

In effect on the upstream there is no IP Profile. It is always to the product speed, in your case 2Mbps, and I don't think Plusnet have a copy system running for that.

Edited by RobertoS (Sat 17-Oct-15 19:58:09)

Bob Thank you for this, at least I can ask PNet to raise their arbitrary value and squeeze a bit more from my service if I have understood you correctly.

I reckon so.

If you weren't on maximum sync and always will be, it would self-correct when the BTW IP Profile changed. As it is, it won't.

PNet support changed the IPProfile up to 40Mbps last night [though it still shows as 37Mbps on their portal]
Got 2Mbps more this morning so up to 37.4Mbps.
Many thanks to you!!

Qu. Why does BTW have an IPProfile of 38.71 and not 40?

As stated earlier 40 * 0.9679 happens to work out at 38.716 Hmm

Edited by deleted (Sun 18-Oct-15 10:17:13)

Pass .

In reply to a post by RobertoS:

Pass .

LOL

In reply to a post by jayteepics:

Got 2Mbps more this morning so up to 37.4Mbps.

My experience is also that the Plusnet IP profile system undercooks things by 1.5 - 2.5Mbps. I've given up on trying to persuade plusnet of that though.

Qu. Why does BTW have an IPProfile of 38.71 and not 40?

When your line transfers 40 Mbits, the data is encapsulated into some PPPoE frames, with some header data. Once you strip those headers from 40 Mbit, you are left with 38.71Mbits of IP packet data.

The IP profile is used to control transfer at this higher IP level - so a setting (by BT) of 38.71 ensures the FTTC line will be 100% occupied on a 40 Mbps sync.

When your computer further strips the TCP and IP headers, you are left with around 37.5 Mbit. That's why speed testers only get up to that level.