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FEC Errors

rbroadbe
Dabbler
Posts: 10
Registered: 31-07-2007

FEC Errors

Hi there,
I was just browsing through my router's (ADSL TG582n) set up pages and noticed on the connection page some huge numbers.  I wondered if someone could explain whether this is bad.  Assuming these counters get reset when the router is rebooted it appears I have had 599 million FEC errors in 24 days.  Is that normal?
Any information about FEC errors (or any of these errors) would be appreciated.

Uptime: 24 days, 12:51:58
DSL Type: ITU-T G.992.5
Bandwidth (Up/Down) [kbps/kbps]: 1.087 / 7.611
Data Transferred (Sent/Received) [MB/GB]: 606,89 / 1,22
Output Power (Up/Down) [dBm]: 12,8 / 0,0
Line Attenuation (Up/Down) [dB]: 20,9 / 42,0
SN Margin (Up/Down) [dB]: 6,0 / 1,4
System Vendor ID (Local/Remote): TMMB / ----
Chipset Vendor ID (Local/Remote): BDCM / 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): -
Error Seconds (Local/Remote): 3.009 / 0
FEC Errors (Up/Down): 20.969 / 599.860.089
CRC Errors (Up/Down): 3.742 / 9.040
HEC Errors (Up/Down): 3.600 / 103.848
Cheers,
Rich
2 REPLIES
Superuser
Superuser
Posts: 9,149
Thanks: 556
Fixes: 46
Registered: 06-04-2007

Re: FEC Errors

I wouldn't worry about the number of FEC errors shown there. FEC (Forward Error Correction) errors reflect transmissions that interleaving has been able to fix, so the end result is *not* an error. Large numbers seem to be a 'feature' of Thomson routers, especially on phone lines which have seen better days.
For reference my current stats show a larger number in a similar uptime.
Uptime: 22 days, 21:51:54
DSL Type: ITU-T G.992.5
Bandwidth (Up/Down) [kbps/kbps]: 1.216 / 9.413
Data Transferred (Sent/Received) [MB/GB]: 991,90 / 1,99
Output Power (Up/Down) [dBm]: 12,8 / 0,0
Line Attenuation (Up/Down) [dB]: 18,3 / 33,5
SN Margin (Up/Down) [dB]: 5,5 / 3,0
System Vendor ID (Local/Remote): TMMB / ----
Chipset Vendor ID (Local/Remote): BDCM / 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): -
Error Seconds (Local/Remote): 39.575 / 0
FEC Errors (Up/Down): 3.684 / 1.602.846.846
CRC Errors (Up/Down): 476 / 101.044
HEC Errors (Up/Down): 630 / 2.174.871
David
rbroadbe
Dabbler
Posts: 10
Registered: 31-07-2007

Re: FEC Errors

Thank you for your explanation.
Rich