Stuck IP Profile?

In early April we had a small drop in speeds on the TBB speed tester from 73-74Mbps on both single and multi thread down to 70-70.5Mbps.

Our line syncs at 79987/20000 so we are on an unrestricted connection profile.

The BTw speedtest additional diagnostics confirms that the IP profile allocated to our line is 73.77 Mbps:

Additional Information: IP Profile for your line is - 73.77 Mbps

My understanding is that the IP profile should negotiate itself be 96.8% of the sync speed for a BTw connection, so should be ~ 77.3 Mbps, not the 73.77Mbps that the BT speedtester is reporting.

It seens plausible that the speed test results drop in April is associated with the IP Profile having lowered itself.

Why would the IP Profile drop below the 96.8% figure and is there anything that the ISP (IDNet in my case) can do to request it to be reset?

Interleaving and G.INP can impact the IP profile in some cases

In reply to a post by jaydub:

Why would the IP Profile drop below the 96.8% figure and is there anything that the ISP (IDNet in my case) can do to request it to be reset?

I have an IDNet line with a slightly lower connection speed but the same big gap between sync speed and IP profile.

IDNet have confirmed that the line is set to retransmission high which reduces the 96.8% figure and that BT will not do a DLM reset as the line is within spec.

As a side issue and building on various postings in this and other discussions on the internet, there are reports that lines with G.INP enabled and which have seen the SNR dropped by DLM to 3dB have had their settings automatically changed to retransmission high. Obviously anecdotal evidence on the internet is likely to give a weighted answer but is it actually the case that the change to retransmission high is an automatic result of the SNR being adjusted down to 3dB - or is it just a small number of cases which have been recorded and publicised while most people are trundling on quite happily at 3dB SNR without the retransmission high roadblock.

Edited by GonePostal (Mon 25-Nov-19 12:35:52)

In reply to a post by GonePostal:

I have an IDNet line with a slightly lower connection speed but the same big gap between sync speed and IP profile.

IDNet have confirmed that the line is set to retransmission high which reduces the 96.8% figure and that BT will not do a DLM reset as the line is within spec.

According to the same Kitz page where I sourced the 96.8% IP profile negotiation, it suggests this falls to ~91% when retransmission high is activated, which I am guessing is what you are seeing.

I am on an ECI cabinet, so don't need to worry about G.INP and have a non interleaved line.

Profile Name 0.128M-80M Downstream, Error Protection Off - 0.128M-20M Upstream, Error Protection Off

I can't immediately think of any reason why why the IP Profile should be as low as it is.

In reply to a post by jaydub:

In reply to a post by GonePostal:

I have an IDNet line with a slightly lower connection speed but the same big gap between sync speed and IP profile.

IDNet have confirmed that the line is set to retransmission high which reduces the 96.8% figure and that BT will not do a DLM reset as the line is within spec.

According to the same Kitz page where I sourced the 96.8% IP profile negotiation, it suggests this falls to ~91% when retransmission high is activated, which I am guessing is what you are seeing.

I am on an ECI cabinet, so don't need to worry about G.INP and have a non interleaved line.

Profile Name 0.128M-80M Downstream, Error Protection Off - 0.128M-20M Upstream, Error Protection Off

I can't immediately think of any reason why why the IP Profile should be as low as it is.

Bt bras server is foo barred or is applying incorrectly configured IP profiles to some circuits i have a similar issue to yours but i have G.inp RTX high activated full sync but only 68mbps throughput and no visibility of the BT Bras IP profile because their [censored] tester doesn't work as intended either, how many more are getting shaftd in this way by BT Wholesale