I read the thread.
Highly doubt it's broken.
It's a bad system granted however even on full sync I frequently see interleaving come on. When I look back it's always for a reason (I have my stats recording).

If you keep the equipment on for 21 solid days I'm sure things will improve in that time. If they don't I'd say that it's due to your line conditions / as you say a fixed profile which isn't overly common nowadays.

Edited by ukhardy07 (Mon 27-May-13 15:45:53)

Think about it, where are the cables with the highest number of VDSL circuits within them ?

Those closest to the cab. So the closer you are, the more likely you are to have more VDSL circuits running in the same cable as yours.

AND why do i need to involve OR to maintain my ZEN connection

Because Zen are reselling an Openreach product.

yes the isp needs to get the engineer out, so whilst not impossible openreach have made it a much more harder process than it needs to be I expect as a deterrent.

whilst I agree the isp's are put in a tough position. I certianly dont let openreach of as easy as you.

there is quite a few things openreach could do but simply they choose not to.

eg. they can choose to not have a 24/7/365 DLM so the line might go unstable but with the benefit of always fast path.
they can make DLM up the snr or band the line in preference to applying interleaving, they choose not to.
they can decrease crosstalk by lowering density of lines, applying vectoring, thus far have chosen not to although vectoring is been trialed now.
they can maybe resolve it by a pair swap, we dont know if this would help the OP as he hasnt managed to get it that far.

of course we dont know why he is been interleaved it could be crosstalk, it may not be crosstalk.

if his fault is ongoing ie. the FEC error rate is high, then there is little point in having the profile reset, the source of the errors has to be squashed first else interleaving will just come back.

Edited by Chrysalis (Mon 27-May-13 20:04:31)

In cases where there's been a fault that has affected a profile, and the profile isn't changing back as it should, we would send an engineer out. The individual circumstances will determine what corrective action is taken (or if any is appropriate at all).

regards,
Phil.

In reply to a post by mixt:

In reply to a post by ukhardy07:

The way fibre works means that overtime as more and more people get fibre crosstalk becomes higher and higher between lines. This means that over time the chance of interleaving coming on is higher and higher.

Never considered crosstalk over time. You make a good point there.

However, this then begs a question. If latency is important for some people, who-o-why do BT put everyone on the same standard FTTC profile (full-sync) and then rate limit at their equipment? (for the 40/10 connection, in my case). If the thing only synced at 40/10, it could probably operate fully at this sync speed without the need for interleaving, even with 20 more people coming into the cabinet generating cross talk. Instead, they choose to make the line sync at the maximum possible and then rate limit to create their 40/10 connection. Seems backward to me.

latency important?


taken, copy and pasted from test results about 3 racers from the northwest 200 road races. expert opinions. and results they gathered just this nw200. it's up on bbc now.

Human reaction time is between 150 and 300 milliseconds. If a rider is travelling at 200mph, he is travelling 90 metres per second. In the one-fifth of a second he takes to react, he will have travelled about 18 metres. This means that if anything unexpected happens within 20 metres of a rider, a high speed collision can be unavoidable.

the report goes on to show that you react differently at different heartrates.

interesting read and relavent in my opinion.

http://www.bbc.co.uk/science/0/22488580

good luck in sorting it.

Edited by deleted (Tue 28-May-13 19:21:14)

However, this then begs a question. If latency is important for some people, who-o-why do BT put everyone on the same standard FTTC profile (full-sync) and then rate limit at their equipment? (for the 40/10 connection, in my case). If the thing only synced at 40/10, it could probably operate fully at this sync speed without the need for interleaving, even with 20 more people coming into the cabinet generating cross talk. Instead, they choose to make the line sync at the maximum possible and then rate limit to create their 40/10 connection. Seems backward to me.

Um, is that true? My line is able to support well over 80/20 and when I initially had it activated, it sync'd at 40/10 (because that's what was ordered). My line can sync in excess of 80/20 (about 96/25 by my estimates from Openreach's test equipment. So if it always sync'd at the max possible, surely I'd have sync'd at 96/25 or 80/20 even though I was on 40/10 - as I understand (and based on everything I've ever seen), it sync's at the rate the line is actually provisioned at (or the nearest lower down if it can't support the full rate), but it doesn't sync above the agreed speed.

ah well thanks all for the responses its pretty academic now the connection has gone even worse to the point i ping google (8.8.8.8) at 70ms yet i just downloaded a linux iso on torrent at 8.9MBs and currently uploading the same at 2.1 MBs granted the number of seeds etc can slew the results a little, current ping to our gameserver is 65 and a trace shows the contention is within zens network which peaks at a ping of 55 on 2 hops the nl hops show 17 and 22 respectively i guess zens network or peers are just causing the issue i also went direct to the bt modem to eliminate the router, just used my MAC and will be off Zen in 2 weeks shame its my local co and i have been loyal for many years paying what frankly is over the odds for limited download capacity but the ping made it worth it now thats gone i may as well save the money, just got my zen bill today £62.00 thats the monthly loss they will have in future.

I did a traceroute to your server the other day and the latency shot up at their london node. It would be fine if the packet loss was low, I used to play quake2 on US servers with a ping of 300 and still hand most players their bottom.

Go elsewhere. BT is far cheaper & ultimately on fttc you don't get the advanced management as much.
I agree that on fibre anything other than mass market ISP is currently overpriced and not really any better.

I had an engineer out once to reset my profile via sky. They promised me no fee. The profile got stuck after a line issue. It was pretty painless.

I like zen & think they're great but it's not worth £62!!! I have sky TV fibre & line rental for less.