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Author Topic: FEC issues  (Read 1306 times)

kitz

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Re: FEC issues
« Reply #15 on: July 09, 2017, 10:32:35 AM »

Quote
VDSL Range A (Clean)   65.1   48.5 

As you are still performing within range, your ISP are very unlikely to want to call out an Openreach engineer :'(

RE graphs.  Bit hard to say without looking at all other graphs, and not seeing across full frequency range but...
D1 seems a bit noisy.   QLN for D2 range is showing classic signs of crosstalk.
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nsmhd

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Re: FEC issues
« Reply #16 on: July 09, 2017, 04:50:38 PM »

Quote
As you are still performing within range, your ISP are very unlikely to want to call out an Openreach engineer :'(
Your right there and I know I'm not alone it's a shame they keep changing the range as well making it lower which is because of crosstalk. My range used to be 71-54 not long ago. It would be great if we could all have FTTP but looks like OR are going with G.fast which unfortunately will properly have the same issues. I will signup to DSL Stats so I can share my full graphs.
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nsmhd

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Re: FEC issues
« Reply #17 on: July 10, 2017, 04:29:25 PM »

Looks like something has changed today as both CES and FEC errors have dropped significantly with no spikes for almost 24 hours.
I have now signed up to My dsl webstats username nsmhd.
Thanks again for all your help and hopefully the banding will be lifted eventually.
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j0hn

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Re: FEC issues
« Reply #18 on: July 10, 2017, 05:38:36 PM »

You shouldn't get any FEC on the downstream with INP=0 and Interleave=1

The stats on the web interface for the HG612 are incorrect, only the stats via telnet are correct.
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ejs

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Re: FEC issues
« Reply #19 on: July 10, 2017, 08:49:19 PM »

         VDSL2 framing
         Bearer 0
MSGc:      20      19
B:      247      238
M:      1      1
T:      64      13
R:      6      16
S:      0.1435      0.5562
L:      14160      3668
D:      1      1
I:      254      255
N:      254      255

The non-zero R values show there is a small amount of FEC on both the downstream and the upstream.

FEC adds coding gain, so it's not necessarily a net-loss of bandwidth. Or perhaps one or other end decided to make use of the available capacity that can't be used for data due to the capped rate.
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nsmhd

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Re: FEC issues
« Reply #20 on: July 12, 2017, 06:20:57 PM »

Thanks for the further replys interesting to know :)
Errors across the board are still lower than last few weeks so fingers crossed it is fixed. I'm going on holiday next week and ideally would like to Power down and disconnect the modem in case of thunderstorms etc is this likely to further prolong the capped speed or make it worse?
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burakkucat

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Re: FEC issues
« Reply #21 on: July 12, 2017, 07:38:32 PM »

I'm going on holiday next week and ideally would like to Power down and disconnect the modem in case of thunderstorms etc is this likely to further prolong the capped speed or make it worse?

That reads as a sensible action. I can't see it making the situation worse, the DLM will just regard it as a long-term outage and ignore the circuit.
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nsmhd

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Re: FEC issues
« Reply #22 on: July 12, 2017, 10:02:21 PM »

Thanks burakkucat that's a relief
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nsmhd

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Re: FEC issues
« Reply #23 on: August 22, 2017, 06:32:10 PM »

Hi all,
Just thought I would give an update almost 3 months since my speed was banded by DLM at 54999 down it is still banded unfortunately. How long should it normally take for DLM to relent my line has been stable since I'm on MDWS with the same username?
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Ixel

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Re: FEC issues
« Reply #24 on: August 22, 2017, 06:53:14 PM »

Banding by DLM is an odd thing. I've been banded in the past and it's taken near on a year before it was finally removed. I think some others have had similar experiences with banding removal taking a long time or seeming to never happen.
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banger

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Re: FEC issues
« Reply #25 on: August 22, 2017, 07:06:20 PM »

I may be wrong but from your MWDS I can see DS ES and banding may not be removed until the DS errors are reduced or a circuit re-calc.
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nsmhd

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Re: FEC issues
« Reply #26 on: August 23, 2017, 05:20:00 PM »

Thank you for the replys, I will see what else I can do to get the errors down I did notice one set of my traffic lights was yellow.
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nsmhd

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Re: FEC issues
« Reply #27 on: August 26, 2017, 08:45:35 AM »

Just to give an update In an attempt to bring down the ES rate on DS I have followed Les-70's brilliant post and capped my speed lower at 40/15 and my error rate has gone from average 30/hour to 7/hour. The traffic light for speed MTBE is now green. I have ordered some ferrit clips to go round the cables going into the modem and also some copper mesh to go round the modem to rule out any interfearence internally.
Is there any way of finding out what profile your on I.e speed, standard or stable? My ISP is Sky.
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skyeci

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Re: FEC issues
« Reply #28 on: August 26, 2017, 08:53:12 AM »

sky usually put you on standard, I was for about 12 months then asked to be put on speed profile like the majority of other ISP's, they did this with no problem. I was/am on sky fibre pro so this might have made the speed profile change request easier.
« Last Edit: August 26, 2017, 09:46:00 AM by skyeci »
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nsmhd

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Re: FEC issues
« Reply #29 on: August 26, 2017, 08:54:58 AM »

Thanks Skyeci that's good to know :)
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