In reply to a post by RobertoS:

I know it is good, but I used to have more and there is no good reason in my line stats for banding. There may have been in the past.

It appears from other lines that WWWombat is aware of that these days Openreach have stopped completely removing banding, and only reduce how severe it is.

I'm also running on an SNRM of ~9.8dB with less than 0.3dB variance.

can you not see what your max attainable is compared to your current sync?

i know that sometimes dlm can get stuck and requires an engineer to undo it, but im a lucky son of a gun, i kept resetting my router the other day to find i was then banded and my latency went up 16ms. however it only took one day for it to be removed.

with an snr of 9.8 there is clearly more speed to be had out of your line, how long has it been banded for,

Edited by arronlowley (Mon 13-Feb-17 13:02:00)

They provide 76/19 as an option so would mean no drop in speed

also, the bt speed checker stats say i should be able to get 73Mbps, but let me tell you something ive found, when youre banded, because your snr is higher, your max attainable is also higher. when youre unbanded, you find that it drops.

when i was connected with sky, it showed a max attainable of 67Mbps, when dlm kicked in, it said my max attainable was 70Mbps, now that dlm is gone, im getting 65Mbps, with a max attainable of 65Mbps.

do you see what i mean.

Edited by arronlowley (Mon 13-Feb-17 13:05:09)

I have a wildcard to throw into the mix...

Remember that William's line is
a) In the 5-4-3dB trial
b) Currently showing very high levels of retransmissions

One parameter that the modem gives us, once retransmission is activated, is the "minEFTR" parameter - the "minimum Effective Throughput Rate". This normally matches the sync speed, but it reduces when retransmission levels get high.

Luckily, it is one of those graphed on MDWS. For William's line, the retransmissions are high enough that "minEFTR" shows reductions ... regularly reaching reductions of 500kbps, sometimes 800kbps with occasional spikes of larger reductions.

Is it plausible that BT's "IP Profile" value could be made more dynamic as part of this trial? And that it sets the value based on observed "minEFTR" values?

Or, is it plausible that BT sets static, but slightly reduced, IP Profiles in the trial, to offset a reasonable amount of retransmissions?

I doubt we'll know, unless people in the trial start to keep a regular log of IP Profile values - whether there has been a resync or not.

One of the reasons I asked if he was still on the trial.

I suspect, that like G.INP changes the IP profile calculation, Wholesale may also be trialling some differences with the lower SNR trial.

In reply to a post by arronlowley:

when i was connected with sky, it showed a max attainable of 67Mbps, when dlm kicked in, it said my max attainable was 70Mbps, now that dlm is gone, im getting 65Mbps, with a max attainable of 65Mbps.

That a long-known side-effect of DLM activating old-style protection (just FEC and interleaving). The modem notices the coding gain added by FEC, so calculates a higher attainable. Turn the FEC coding gain off again, and the attainable falls back to normal.

It isn't "DLM kicking in", though. It doesn't happen when DLM activates retransmission-based protection instead.

In reply to a post by WWWombat:

In reply to a post by arronlowley:

when i was connected with sky, it showed a max attainable of 67Mbps, when dlm kicked in, it said my max attainable was 70Mbps, now that dlm is gone, im getting 65Mbps, with a max attainable of 65Mbps.

That a long-known side-effect of DLM activating old-style protection (just FEC and interleaving). The modem notices the coding gain added by FEC, so calculates a higher attainable. Turn the FEC coding gain off again, and the attainable falls back to normal.

It isn't "DLM kicking in", though. It doesn't happen when DLM activates retransmission-based protection instead.

i see i see, there must have been a few new customers in my area because when i was with bt, i got 80/20 with a max attainable of 85/22.

then it dropped to 71/20 and i was peed, an engineer came and told me "you never got 80/20", i proved him wrong. anyhow with sky its dropped another 6Mbps, but its better than being with virgin media, who by the way suck as you have already seen me say.

Woah, lots of replies!

In reply to a post by arronlowley:

also, can you put either your telephone number, or address in here and let me see what it says the max for your line is, i think the address checker is the best.

https://i.gyazo.com/653a2fa0146764a5d2d446123186b3b2...

In reply to a post by arronlowley:

can you also please open up cmd and ping bbc.co.uk and share the results, this way i can tell if youre interleaved or not, thanks.

http://i.imgur.com/gWIQb9R.png

In reply to a post by RobertoS:

Is there any chance your line is banded? One of my thoughts is that it could be to do with that. What is your sync?

No, my line is on the trial.

In reply to a post by WWWombat:

Is it plausible that BT's "IP Profile" value could be made more dynamic as part of this trial? And that it sets the value based on observed "minEFTR" values?

Or, is it plausible that BT sets static, but slightly reduced, IP Profiles in the trial, to offset a reasonable amount of retransmissions?

That would make sense, seen as the last thing BT Wholesale want is more reports of line faults due to their own trial.

In reply to a post by MrSaffron:

They provide 76/19 as an option so would mean no drop in speed

Fair enough, but I'm not sure the price would be deemed acceptable to my parents and we're in contract with BT.

Edited by deleted (Mon 13-Feb-17 13:21:33)

In reply to a post by WWWombat:

I have a wildcard to throw into the mix...
...
One parameter that the modem gives us, once retransmission is activated, is the "minEFTR" parameter - the "minimum Effective Throughput Rate". This normally matches the sync speed, but it reduces when retransmission levels get high.

That is interesting. I wondered what that new line was and what it was.

For information, but I don't need to discuss my line here as it is WG's thread with a different problem altogether from my 55Mbps banding, my sync is 54999Kbps and the minEFTR is 55003.

Yet AA are being told a lower sync and the IP Profile tallies with that lower sync. Bah!

It may be worthing emailing AAISP to ask for a DLM reset, I got one and wasn't charged. But, then I was very lucky.