topic Re: FEC CRC and ES errors in Broadband

FEC CRC and ES errors

lenny — Thu, 03 Sep 2015 02:17:11 GMT

I have been getting drops in my connection over the last few weeks but this seams to have got worse in the last 7 days , what I have noticed is that when this happens , just before my adsl connection drops and reconnects there is a very large increase in FEC CRC and ES errors , in there thousands for FEC errors and Hundreds for the others.During the day the error count is very low
I have had everything turned of in the house apart from the pc and router and this still happens
My line comes into the house to the master socket with a mk3 faceplate fitted and there is a data extention from this which goes for about 10' and my router plugs into this, I have 1 telephone plugged in to the master socket
adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Max: Upstream rate = 900 Kbps, Downstream rate = 4224 Kbps
Channel: INTR, Upstream rate = 448 Kbps, Downstream rate = 3872 Kbps
Link Power State: L0
Mode: G.DMT
TPS-TC: ATM Mode
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 5.4 17.0
Attn(dB): 63.5 31.5
Pwr(dBm): 19.0 11.9
G.dmt framing
K: 122(0) 15
R: 10 4
S: 1 4
😧 32 8
Counters
SF: 1707105 1707118
SFErr: 134382 20
RS: 116083170 29019068
RSCorr: 78611336 33
RSUnCorr: 152151 0
HEC: 56476 11
OCD: 0 7
LCD: 0 2
Total Cells: 264959905 0
Data Cells: 5298984 0
Drop Cells: 0
Bit Errors: 0 0
ES: 21609 0
SES: 135 0
UAS: 372 372
AS: 29021
INP: 1.21 1.00
PER: 1.75 1.75
delay: 8.00 8.00
OR: 32.00 32.00
Bitswap: 2147 8
Total time = 13 hours 57 min 47 sec
FEC: 83198380 0
CRC: 137915 0
ES: 21609 0
SES: 135 0
UAS: 372 372
LOS: 1 0
LOF: 9 0
Latest 15 minutes time = 12 min 47 sec
FEC: 2168985 0
CRC: 8715 0
ES: 697 0
SES: 11 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 2503956 0
CRC: 7086 0
ES: 784 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Latest 1 day time = 13 hours 57 min 47 sec
FEC: 83198380 0
CRC: 137915 0
ES: 21609 0
SES: 135 0
UAS: 372 372
LOS: 1 0
LOF: 9 0
Previous 1 day time = 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Since Link time = 8 hours 3 min 41 sec
FEC: 78611336 33
CRC: 134382 20
ES: 21334 0
SES: 60 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
>

This is my ticket number 110142400 ,broadband fault raised

Has anybody any ideas or recommend's please
Thanks
Chris

Re: FEC CRC and ES errors

lenny — Thu, 03 Sep 2015 07:26:44 GMT

a few bt reports and stats again
adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 896 Kbps, Downstream rate = 4768 Kbps
Channel: INTR, Upstream rate = 448 Kbps, Downstream rate = 4416 Kbps
Link Power State: L0
Mode: G.DMT
TPS-TC: ATM Mode
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 6.1 17.0
Attn(dB): 63.5 31.5
Pwr(dBm): 19.1 12.1
G.dmt framing
K: 139(0) 15
R: 10 4
S: 1 4
😧 32 8
Counters
SF: 49677 49617
SFErr: 15 0
RS: 3378066 843489
RSCorr: 137455 0
RSUnCorr: 243 0
HEC: 11 0
OCD: 0 0
LCD: 0 0
Total Cells: 8795807 0
Data Cells: 569443 0
Drop Cells: 0
Bit Errors: 0 0
ES: 10 0
SES: 0 0
UAS: 9 9
AS: 845
INP: 1.07 1.00
PER: 1.75 1.75
delay: 8.00 8.00
OR: 32.00 32.00
Bitswap: 152 3
Total time = 14 min 18 sec
FEC: 137455 0
CRC: 15 0
ES: 10 0
SES: 0 0
UAS: 9 9
LOS: 0 0
LOF: 0 0
Latest 15 minutes time = 14 min 18 sec
FEC: 137455 0
CRC: 15 0
ES: 10 0
SES: 0 0
UAS: 9 9
LOS: 0 0
LOF: 0 0
Previous 15 minutes time = 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Latest 1 day time = 14 min 18 sec
FEC: 137455 0
CRC: 15 0
ES: 10 0
SES: 0 0
UAS: 9 9
LOS: 0 0
LOF: 0 0
Previous 1 day time = 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Since Link time = 14 min 3 sec
FEC: 137455 0
CRC: 15 0
ES: 10 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
>

Re: FEC CRC and ES errors

lenny — Thu, 03 Sep 2015 12:41:59 GMT

adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 896 Kbps, Downstream rate = 4768 Kbps
Channel: INTR, Upstream rate = 448 Kbps, Downstream rate = 4416 Kbps
Link Power State: L0
Mode: G.DMT
TPS-TC: ATM Mode
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 6.6 17.0
Attn(dB): 63.5 31.5
Pwr(dBm): 19.1 12.1
G.dmt framing
K: 139(0) 15
R: 10 4
S: 1 4
😧 32 8
Counters
SF: 1503201 1503235
SFErr: 476 5
RS: 102217698 25553550
RSCorr: 2978943 65
RSUnCorr: 17563 0
HEC: 357 2
OCD: 12 0
LCD: 0 0
Total Cells: 266124025 0
Data Cells: 2767066 0
Drop Cells: 0
Bit Errors: 0 0
ES: 101 0
SES: 7 0
UAS: 9 9
AS: 25555
INP: 1.07 1.00
PER: 1.75 1.75
delay: 8.00 8.00
OR: 32.00 32.00
Bitswap: 1189 4
Total time = 7 hours 6 min 8 sec
FEC: 2978943 0
CRC: 476 0
ES: 101 0
SES: 7 0
UAS: 9 9
LOS: 0 0
LOF: 0 0
Latest 15 minutes time = 6 min 8 sec
FEC: 27884 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 83013 0
CRC: 2 0
ES: 2 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Latest 1 day time = 7 hours 6 min 8 sec
FEC: 2978943 0
CRC: 476 0
ES: 101 0
SES: 7 0
UAS: 9 9
LOS: 0 0
LOF: 0 0
Previous 1 day time = 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Since Link time = 7 hours 5 min 55 sec
FEC: 2978943 65
CRC: 476 5
ES: 101 0
SES: 7 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
>

Re: FEC CRC and ES errors

lenny — Fri, 04 Sep 2015 05:48:32 GMT

Still happening . and now have crackling on the phone line

Re: FEC CRC and ES errors

lenny — Sat, 05 Sep 2015 05:34:21 GMT

Still getting a burst of errors from 6 to 8 in the evevings and 7to 8 in the mornings which causes the disconnects, no problem found on my line according to the reply to my ticking and no response here from any staff
Anybody have any ideas , there is nothing in the house that's causing this as nothing switches on or off in these times

Re: FEC CRC and ES errors

lenny — Sat, 05 Sep 2015 08:14:42 GMT

I am getting crc errors on the upstream when I use the telephone ,is this normal, my line stats can be found on MDWS under the name freelander if some one would like to look
Cheers
Chris

Re: FEC CRC and ES errors

Townman — Sat, 05 Sep 2015 10:36:38 GMT

Quote from: lenny
Still happening . and now have crackling on the phone line

Hi Chris,
Well that's your issue! There is no point looking at BB stats whilst the line is noisy. If PN provide your PHONE service, please use the phone faults link below to report a noisy (intermittently?) phone line fault. Otherwise, do the same with your phone provider, but do not mention you have a broadband issue to them!
Kevin

Re: FEC CRC and ES errors

lenny — Sat, 05 Sep 2015 19:07:03 GMT

Thanks for reply ,have done loads of quiet line test today and nothing heard , just gad a burst of errors on the line again and a resync which coincided with the street lights turning on which follow the same pattern every night , how do I go about this problem please

Re: FEC CRC and ES errors

Townman — Sat, 05 Sep 2015 19:49:27 GMT

@CRT,
Can you post a VR plot so we can see if there is a clear pattern of problems possibly coincident with the street lights switching on/off.
Any chance of a CLT report please, particularly ac balance.
Thanks,
Kevin

Re: FEC CRC and ES errors

lenny — Sat, 05 Sep 2015 20:09:46 GMT

Thanks Kevin, there will be a few disconnects that I have caused in the mornings , the ones I an concerned about with the lights are around the 7.30 to 8.10 pm time and 4.30 to 6.30 am time slots ,
I have been using http://www.mydslwebstats.co.uk ; ( user name freelander ) to monitor for the last 3 days if you would like to take a look
Thanks
Chris

Re: FEC CRC and ES errors

Townman — Sat, 05 Sep 2015 20:20:59 GMT

Hi Chris,
Do not seem to be able to access that. Think I'll need to take a closer look at the service and establish access to it.
Kevin

Re: FEC CRC and ES errors

lenny — Sat, 05 Sep 2015 20:29:36 GMT

Here is a plot showing errors over 2 days both lots of errors start around 7.45 pm with resync happening at about 8pm

Re: FEC CRC and ES errors

Townman — Sat, 05 Sep 2015 20:51:52 GMT

Chris,
That's fab, is there a SNRM plot please? There is clearly something going on here which is time related. You might get stability (but at a lower speed) if your force a resynch at night time. Not ideal, but until we can get the line looked at, it should reduce the level of disconnects.
I've just reread the thread....
If I accept that your reported attenuation is correct, then the line is synching a lot faster than might be reasonably expected. That could contribute to the error rate. What does this http://www.kitz.co.uk/adsl/adslchecker.php suggest for line length and speed please? Also see if 21CN is available on your exchange.
Please keep doing quiet line checks through the evening. Noise issues can be intermittent and therefore difficult to resolve.
What's the mode being used please? I'm unlikely to provide insight to its performance, but there are others around here who might. Have you adjusted any settings to squeeze more speed out of it?
Really need CRT to pick up your fault ticket mentioned in the first post.
Kevin

Re: FEC CRC and ES errors

lenny — Sat, 05 Sep 2015 21:01:42 GMT

Hi
I am on a 20cn exchange on adsl upto 2mb speed , I use a billion 7800 router which connects at 6db with a sync speed of approx 4242 I have tweaked the snr higher to 7.5db to try and decrease the errors which worked quite well giving me a stableish speed of 3.5mb up until about 7 days ago when I get these errors which a uses the resync.

Re: FEC CRC and ES errors

Townman — Sat, 05 Sep 2015 21:17:40 GMT

Chris,
The information you've provided is simply excellent - you've covered all of the major points of investigation in hours which usually takes days. The SNRM plot is terrible. There is clearly interference from somewhere. This needs PlusNET to progress your open fault report. Hopefully the information you've posted here will be helpful.
It would do no harm to post those images to the support ticket.
I'm suspicious of the reported attenuation, did you look for the reported line length via the previous link I posted?
About all you can do now is to wander around the street lights with a portable AM radio - see http://www.kitz.co.uk/adsl/rein.htm#REIN_identify
HTH,
Kevin

Re: FEC CRC and ES errors

lenny — Sun, 06 Sep 2015 05:17:49 GMT

The other thing I have noticed ,that could point to a problem with equipment in the exchange is that when these increases in errors happen my interleaved depth alters from 32 to 16 on the Downstream , see graph for interleaving and a new error graph shown them threw the night and dropping again,

Exchange Information
Exchange: Saltfleetby BT Code: SLSAY
Location: Church Lane, LN11 7TU
Distance:- Direct: 3.89 km
(appx)* By Road: 4.8 km
Status
ADSL enabled: June 29, 2005
DSL Max enabled: March 31, 2006
21CN WBC (Broadband) Not available31.03.11
21CN due : (PSTN) info N/A
FTTC Not available
SDSL enabled : Not Enabled
Broadband Access Market Broadband Access† Market 1
BT price band BTw Pricing Band Band E

Thanks for your comments Kevin

Re: FEC CRC and ES errors

lenny — Sun, 06 Sep 2015 10:38:38 GMT

I have just caused a resync looking at my router stats and clicked save which caused a reboot , but that has now increased my interleaved depth to 32 again till tonight when I loose sync around 7.50pm ish again because of what ever is causing the tremendous rise in errors

Re: FEC CRC and ES errors

lenny — Sun, 06 Sep 2015 18:43:24 GMT

Well the errors are rising and it getting dusk again ,I think the resync is not far of the lights are due on again

Re: FEC CRC and ES errors

lenny — Sun, 06 Sep 2015 18:45:41 GMT

The snr has started to drop and the errors rise again

Re: FEC CRC and ES errors

lenny — Sun, 06 Sep 2015 18:52:59 GMT

As these errors rise the streetlight that is next to my DP for my line comes on as it is under a canopy of trees, the rest of the lights on the road then follow .
My snr has dropped to 3.4 and the errors have shot up to 150,000 plus,now 175,000 errors ,lights are on full and errors have jumped to 380,000 and started to drop (time 19.49)