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Standard User davetel
(learned) Tue 09-Jul-13 20:13:02
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Please check error stats before I jump from O2


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Bearing in mind BT's DLM check line errors as well, could my the experts look at my O2 stats and see if all looks OK. Thanks, got MAC today so still deciding. (It is ADSL1 on O2 LLU, not BTw)

Uptime: 7 days, 9:06:36
DSL Type: G.992.1 annex A
Channel mode: Interleave
Maximum Bandwidth (Up/Down) [kbps/kbps]: 1,163 / 6,299
Bandwidth (Up/Down) [kbps/kbps]: 969 / 5,780
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.0 / 19.0
Line Attenuation (Up/Down) [dB]: 31.5 / 55.0
SN Margin (Up/Down) [dB]: 6.0 / 5.0
Vendor ID (Local/Remote): TMMB / BDCM
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 10 / 0
FEC Errors (Up/Down): 2,756 / 86,989,433
CRC Errors (Up/Down): 2,756 / 2,402
HEC Errors (Up/Down): 1,027 / 1,709
Standard User davetel
(learned) Thu 11-Jul-13 12:57:32
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Re: Please check error stats before I jump from O2


[re: davetel] [link to this post]
 
Anyone please!
Standard User WWWombat
(fountain of knowledge) Thu 11-Jul-13 21:42:43
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Re: Please check error stats before I jump from O2


[re: davetel] [link to this post]
 
Those stats say that you have FEC turned on, so we should assume that interleaving is turned on too.

There is a heavy number of line errors that are being caught by the FEC/interleaving process ( about 500,000 per hour), so you should expect that BT's DLM is going to intervene and turn on FEC/interleaving too.

Of those FEC (corrected) errors, 2,400 were bad enough to become CRC errors, or about 13 an hour. That would be an acceptable rate, if it happens gradually.

So, if the stats you have presented represent the state over the entire 7 day period (ie all the stats accumulate at roughly the same rate all the time), then you should expect BT's DLM to turn on FEC/interleaving, and have no other problems.

However, the real problem caused by BT's DLM comes when line conditions vary considerably hour-by-hour, or across the day. So if your statistics spend 72 hours without change, and then go haywire for 15 minutes, you'll have more problems.

From a single snapshot, it is impossible to tell which case applies.


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Standard User IanBB
(member) Thu 11-Jul-13 22:44:42
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Re: Please check error stats before I jump from O2


[re: davetel] [link to this post]
 
You probably would have got a quicker answer if you posted in the O2 forum!

Anyhow, there's nothing to be concerned with regarding your stats as the major error indicators are all zero (LOF, LOS, LOP) and the error seconds are low.

Also, the Speedtouch routers are notorious for over reporting FEC errors so nothing to worry about there either.
Standard User davetel
(learned) Fri 12-Jul-13 00:01:41
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Re: Please check error stats before I jump from O2


[re: IanBB] [link to this post]
 
In reply to a post by IanBB:
You probably would have got a quicker answer if you posted in the O2 forum!

Thought I'd do better posting here as LLU with no DLM like O2 not being concerned with errors, as if I go with PN its the DLM. Only sussed about DLM errors correction/sync by going on PN's own forum, which of course you can't post on unless you are with them. cheers
Standard User davetel
(learned) Fri 12-Jul-13 00:21:10
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Re: Please check error stats before I jump from O2


[re: WWWombat] [link to this post]
 
In reply to a post by WWWombat:
.... if it happens gradually.

So if your statistics spend 72 hours without change, and then go haywire for 15 minutes, you'll have more problems.

From a single snapshot, it is impossible to tell which case applies.

Cheers stats after 2 dys of the 9 so far
Uptime: 2 days, 7:39:54
DSL Type: G.992.1 annex A
Channel mode: Interleave
Maximum Bandwidth (Up/Down) [kbps/kbps]: 1,163 / 6,299
Bandwidth (Up/Down) [kbps/kbps]: 969 / 5,780
....Error Seconds (Local/Remote): 0 / 0
FEC Errors (Up/Down): 795 / 28,118,371
CRC Errors (Up/Down): 795 / 956
HEC Errors (Up/Down): 284 / 538
and today 12.15pm
Uptime: 9 days, 1:41:45
Error Seconds (Local/Remote): 12 / 0
FEC Errors (Up/Down): 3,389 / 102,260,090
CRC Errors (Up/Down): 3,389 / 2,838
HEC Errors (Up/Down): 1,266 / 2,054
and now 12.12am
Uptime: 9 days, 13:01:46
Error Seconds (Local/Remote): 12 / 0
FEC Errors (Up/Down): 3,811 / 110,246,570
CRC Errors (Up/Down): 3,811 / 2,918
HEC Errors (Up/Down): 1,396 / 2,110
and after 5mins from above time
Uptime: 9 days, 13:05:59
Error Seconds (Local/Remote): 12 / 0
FEC Errors (Up/Down): 3,811 / 110,246,639
CRC Errors (Up/Down): 3,811 / 2,918
HEC Errors (Up/Down): 1,396 / 2,110

Thats 69 FEC down in 5 mins, did see somwhere else the thomsom routers misread errors.
Will post back about 9.30 this am FWIW, all good clean line, Clarity faceplate. cat5 to router LAN socket, stable connection no thruput issues, just concerned about BT's/PN DLM. Most resyncs due to 2 second mains glitches, will get UPS if I go on a BT system so's not to upset DLM..

Dave

Edited by davetel (Fri 12-Jul-13 00:22:13)

Standard User davetel
(regular) Fri 12-Jul-13 09:17:09
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Re: Please check error stats before I jump from O2


[re: davetel] [link to this post]
 
FEC
8.15 today
Uptime: 9 days, 21:08:28
Error Seconds (Local/Remote): 12 / 0
FEC Errors (Up/Down): 3,814 / 110,543,847
CRC Errors (Up/Down): 3,814 / 2,974
HEC Errors (Up/Down): 1,398 / 2,151
now 1 hour later
Uptime: 9 days, 22:08:28
Error Seconds (Local/Remote): 12 / 0
FEC Errors (Up/Down): 3,827 / 110,547,293
CRC Errors (Up/Down): 3,827 / 2,977
HEC Errors (Up/Down): 1,400 / 2,154

So that 297,277 overnight 9 hrs pc off and in last hour 3446.
Standard User davetel
(regular) Sun 14-Jul-13 17:13:30
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Re: Please check error stats before I jump from O2


[re: davetel] [link to this post]
 
Earlier after 1hr in Test socket, no traffic

Uptime: 0 days, 1:00:02
DSL Type: G.992.1 annex A
Channel mode: Interleave
Maximum Bandwidth (Up/Down) [kbps/kbps]: 1,159 / 6,264
Bandwidth (Up/Down) [kbps/kbps]: 969 / 5,711
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 0 / 0
FEC Errors (Up/Down): 22 / 8,937
CRC Errors (Up/Down): 22 / 9
HEC Errors (Up/Down): 8 / 7

Assume theres not much can be done with the erros.
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