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New Member

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9 Messages

Mon, Oct 5, 2020 8:41 PM

FEC Errors

I rebooted my router/gateway this morning, and I'm seeing a ton of FEC errors pop up.  Here's the latest stats from the gateway:

 

FEC Errors Line 1 0 1791 1791 1791 1791
FEC Errors Line 2 528 186505 186505 186505 186505
CRC Errors Line 1 0 2 2 2 2
CRC Errors Line 2 0 8 8 8 8

 

Any ideas on what may be causing this?  And is it something I need to be concerned with?  A couple of technicians have been out to our place, at least one of them worked on the lines.  I'm currently not experiencing any issues, but I just swapped out our gateway for a new one because we were getting network drops.

my thoughts

Employee

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18.5K Messages

1 y ago

Your a bonded pair install, what are the stats?

Max rate down / up, user rate down / up, noise margins down / up

 

Will have a profile, this is the user rate... the internet speed tier will be less than the profile.

 

My question is are the lines balanced or near balance (+-20%)

Example if have Internet 50/10 expect the profile to be either 55/12 or 60/13. If the first each line should be around 27.5/6 if the second the 30/6.5. 

 

If one line is under / over by 25-30% or more suggests a problem with the line resulting in the other carrying most of the load, have a lower SNM with result of possible more errors.

 

 

If this is the case, may be as simple as port bounce by support or field tech... or a more serious issue such as half pair due to poor connection either inside or outside the premise. The longer the copper loop the lower the speed tier will be offered, with more splice points that could be any one of them. 

 

An acceptable FEC rate is 100 per minute or 1500 within 15 minutes or  6000 per hour or less. Line interference from storm, electric motors, noisy ac line can cause increase in FECs.

 

http://adslm.dohrenburg.net/troubleshoot/interference.php#:~:text=By%20far%20the%20most%20important,electro%20magnetic%20interference)%20are%20thunderstorms.&text=Thunderstorm%20activity%20can%20interfere%20on%20ADSL%20modems%20as%20far%20a%2040%20miles

 

New Member

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9 Messages

1 y ago

Thank you for the response.  Below are my current settings...I'm not really sure if this is what you were referring to, though:

DSL Status

  Line 1 Line 2
Line State Up Up
Downstream Sync Rate (kbps) 30536 24688
Upstream Sync Rate (kbps) 5967 6247
Downstream Max Attainable Rate (kbps) 35423 30023
Upstream Max Attainable Rate (kbps) 9210 9913
Modulation VDSL2 VDSL2
Data Path Interleaved Interleaved
  Downstream Upstream Downstream Upstream
SN Margin (dB) 9.2 12.2 10.1 11.5
Line Attenuation (dB) 53.6 41.8 54.0 54.2
Output Power(dBm) 14.5 8.8 14.5 9.9
Errored Seconds 1 0 9 0
Loss of Signal 0 0 0 0
Loss of Frame 0 0 0 0
FEC Errors 4579 0 443363 2714
CRC Errors 2 0 15 0

Timed Statistics

  15 Min Cur Day Showtime Last Showtime Total
Errored Seconds (ES) Line 1 0 1 1 1 1
Errored Seconds (ES) Line 2 0 9 9 9 9
Severely Errored Seconds (SESL) Line 1 0 0 0 0 0
Severely Errored Seconds (SESL) Line 2 0 0 0 0 0
Unavailable Seconds (UASL) Line 1 0 63 0 0 63
Unavailable Seconds (UASL) Line 2 0 63 0 0 63
FEC Errors Line 1 120 4579 4579 4579 4579
FEC Errors Line 2 11 443363 443363 443363 443363
CRC Errors Line 1 0 2 2 2 2
CRC Errors Line 2 0 15 15 15 15
DSL Initialization Timeouts Line 1 0 0 0 0 0
DSL Initialization Timeouts Line 2 0 0 0 0 0

 

Are you able to tell with these numbers what my setup is?  The error rate (15 min window) seems to vary quite a bit, but seems to be worse than your acceptable amount of 6000/hour (been running for around 14 hours, so about 32,000 errors per hour).

As far as I know, there's no large electric devices near the line, no storms or other interferences.  The one technician who worked on our lines a couple of months ago commented that we were running on just one line before he fiddled with things.  Not sure what the second technician did, or what else could be going on.

my thoughts

Employee

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18.5K Messages

1 y ago

Your on a longer copper loop, would guess your line distance is actually exceeding the recommend loop length for the speed tier. 

 

Your profile is 55/12 (30.5+24.7 / 5.9+6.2) with low noise margins.

SNM of 9.2 and 10.1... 9 is consider point of questionable service. Preferred is 15 or higher, I generally do not like anything under 12... to improve the noise margin would require dropping your profile to 32 which means your speed tier would become 25/5 instead of 50/10. It should be noted that neither line could properly support 32/6 profile as max rates are 35/9 and 30/9.9 for a total of 65/18.9... if desired minimum 125%+ of profile would be looking for at least 68 not 65.

 

The lines are unbalanced by 11% each way...

should be 27.5 each you have 30.5 and 24.6.

However they are within acceptable range. 

 

Not knowing your loop length or condition of the lines (true test) my initial reaction is your marginal, if having issues with stable service recommend lowering profile / speed tier. No issues, leave as is pushing the envelope.

New Member

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9 Messages

1 y ago

Thank you for your response.  So it sounds like we're kind of riding the ragged edge with our current bandwidth.  At the moment, things seem fairly stable...we just replaced our gateway, and so far we haven't had any drops like we had before.  Would you recommend we downgrade if we start seeing issues?  

New Member

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9 Messages

1 y ago

Well, I spoke too soon.  We had a drop today, and the audio on our cable gets choppy every once in a while.  Rebooting the TV receiver seems to correct it.  I looked at what we have signed up for, and we're currently at the lowest speed available (I think) at 50 Mbps.  Is there a slightly lower speed setting we could put it at to get rid of the potential issues caused by all the errors and signal noise?

New Member

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4 Messages

1 y ago

Bless your heart! I have had the same problem. For almost 3 years there was no problem at all and then one day it started and just wouldn't behave. I am also on a long loop, I want to say something like almost 1,000 ft over what it should be. Basically I figure people in AT&T corporate decided to promise service they didn't know if they could deliver and then left it up to the techs and various other folks to handle to the blow back. 

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