High FEC error rates causing disconnections
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High FEC error rates causing disconnections
16-04-2010 4:22 PM
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Also the router no does not show any data transferred!! See below.
Thanks
David
DSL Connection
Link Information
Uptime: 7 days, 22:49:09
DSL Type: G.992.1 annex A
Bandwidth (Up/Down) [kbps/kbps]: 448 / 2,592
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.0 / 17.0
Line Attenuation (Up/Down) [dB]: 31.5 / 55.0
SN Margin (Up/Down) [dB]: 17.0 / 14.5
Vendor ID (Local/Remote): TMMB / TSTC
Loss of Framing (Local/Remote): 3 / 0
Loss of Signal (Local/Remote): 1 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 24 / 0
FEC Errors (Up/Down): 22 / 88,684
CRC Errors (Up/Down): 22 / 455
HEC Errors (Up/Down): 15 / 397
High FEC error rates causing disconnections
16-04-2010 11:39 PM
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With regard to the high noise margin, what is your target noise margin (the value immediately after restarting the router)? (If you need to restart to find out I suggest doing this during daylight hours when noise levels are usually lower.)
My guess is your target noise margin is probably 12dB. However what has caused the DLM to increase it to that value? Have you experienced lots of disconnections or high numbers of transmission errors?
High FEC error rates causing disconnections
17-04-2010 9:20 AM
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After a restart this is what I get, below.
There have been minimal disconnections recently but a lot of FEC errors.
david
DSL Connection
Link Information
Uptime: 0 days, 0:01:17
DSL Type: G.992.1 annex A
Bandwidth (Up/Down) [kbps/kbps]: 448 / 3,776
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.0 / 18.5
Line Attenuation (Up/Down) [dB]: 31.5 / 56.0
SN Margin (Up/Down) [dB]: 16.0 / 9.0
Vendor ID (Local/Remote): TMMB / TSTC
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): 0 / 0
FEC Errors (Up/Down): 0 / 15
CRC Errors (Up/Down): 0 / 0
HEC Errors (Up/Down): 0 / 0
High FEC error rates causing disconnections
17-04-2010 9:41 AM
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High FEC error rates causing disconnections
17-04-2010 2:33 PM
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Quote from: antiquebrit SN Margin (Up/Down) [dB]: 16.0 / 9.0
That shows your target noise margin is 9dB which is lower than I thought it might be.
As mentioned in the previous response, your line stats are quite decent. Large numbers of FEC error aren't necessarily anything to worry about (my stats show 2 million FEC errors over 5 days, with 1500 CRC errors, and 1450 HEC errors).
Could you post the stats again later on tonight?
High FEC error rates causing disconnections
17-04-2010 3:18 PM
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What gets my goat is that I get these decent figures after a restart but without exception the noise margin and the bandwidth are reset overnight to much less decent values.
david
High FEC error rates causing disconnections
17-04-2010 4:35 PM
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david
DSL Connection
Link Information
Uptime: 0 days, 3:04:35
DSL Type: G.992.1 annex A
Bandwidth (Up/Down) [kbps/kbps]: 448 / 3,776
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.0 / 18.5
Line Attenuation (Up/Down) [dB]: 31.5 / 56.0
SN Margin (Up/Down) [dB]: 17.0 / 9.0
Vendor ID (Local/Remote): TMMB / TSTC
Loss of Framing (Local/Remote): 43 / 0
Loss of Signal (Local/Remote): 5 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 75 / 0
FEC Errors (Up/Down): 0 / 3,154,111
CRC Errors (Up/Down): 0 / 1,088
HEC Errors (Up/Down): 0 / 33
High FEC error rates causing disconnections
17-04-2010 4:52 PM
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High FEC error rates causing disconnections
17-04-2010 8:40 PM
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DSL Connection
Link Information
Uptime: 0 days, 0:08:04
DSL Type: G.992.1 annex A
Bandwidth (Up/Down) [kbps/kbps]: 448 / 3,328
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.0 / 17.5
Line Attenuation (Up/Down) [dB]: 31.5 / 56.0
SN Margin (Up/Down) [dB]: 16.0 / 9.5
Vendor ID (Local/Remote): TMMB / TSTC
Loss of Framing (Local/Remote): 43 / 0
Loss of Signal (Local/Remote): 5 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 84 / 0
FEC Errors (Up/Down): 0 / 287
CRC Errors (Up/Down): 0 / 2
HEC Errors (Up/Down): 0 / 2
High FEC error rates causing disconnections
18-04-2010 12:03 AM
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Quote from: antiquebrit Wow! 3 million FEC errors in 7 hours.
...
Uptime: 0 days, 3:04:35
DSL Type: G.992.1 annex A
Bandwidth (Up/Down) [kbps/kbps]: 448 / 3,776
...
FEC Errors (Up/Down): 0 / 3,154,111
CRC Errors (Up/Down): 0 / 1,088
HEC Errors (Up/Down): 0 / 33
The uptime shown by the router is actually 3 hours - which implies it restarted around 1:30pm, though the sync speed is identical to the value this morning. That FEC error rate is high, and from my experience with the Thomson router it appears to restart once the value approaches 4 million, which ties in with what you are experiencing.
The sync speed is higher than normal for 56dB attenuation (Kitz calculator gives 3424kbps for 6dB target noise margin, so around 2850kbps for 9dB target. However it seems Interleaving is having to work very hard (FEC errors) at the higher sync rate (previous stats showed 89000 FEC errors in almost 8 days synced at 2592kbps).
Whether that count is genuine or not is a debatable point; do you have another router to try?
I think this topic would benefit from being in its own thread, perhaps titled "High FEC error rates causing disconnections". Do you mind if I ask the moderators to split these posts off?
David
High FEC error rates causing disconnections
18-04-2010 12:37 AM
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I'm using a thomson router
Uptime: 10 days, 12:06:30
FEC Errors (Up/Down): 0 / 1.976.951.305
Close to 2 billion errors is somewhat higher than 4 million and no resyncs in the 10 days.
High FEC error rates causing disconnections
18-04-2010 2:33 AM
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High FEC error rates causing disconnections
18-04-2010 8:31 AM
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By all means do ask the moderators to create another thread.
I have a version 6 speedtouch I could try and a an old safecom GWART2-54125. I will try one of these, or even both when I have time.
Thanks again.
David
Re: High FEC error rates causing disconnections
18-04-2010 12:01 PM
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Quote from: spraxyt I was just going on my experience, don't think I've got much beyond 4 million before it restarted. How many CRC and HEC errors have you had?
Uptime: 10 days, 23:30:16
Modulation: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 959 / 2.268
Data Transferred (Sent/Received) [MB/GB]: 484,33 / 3,16
Output Power (Up/Down) [dBm]: 12,5 / 0,0
Line Attenuation (Up/Down) [dB]: 28,0 / 48,5
SN Margin (Up/Down) [dB]: 7,0 / 8,5
Vendor ID (Local/Remote): TMMB / IFTN
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): 1.373 / 0
FEC Errors (Up/Down): 0 / 2.167.085.708
CRC Errors (Up/Down): 0 / 68.284
HEC Errors (Up/Down): 0 / 37.321
Uptime nearly 11 days with no resync
Re: High FEC error rates causing disconnections
18-04-2010 12:53 PM
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i monitored the snr with adsl1 and adsl2 modulation and what i get is alot of bitswaping since changing modulation to adsl2+ im getting alot less bitswaps showing in the snr graph and this is with dmttool configured to read snr every 2 seconds.
just something i thought you may find interesting and perhaps worth a little look.
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