CRC/FEC/HEC errors

builder22 · 14 Feb 2016 at 12:05

what is an acceptable amount of errors? syncing at 16000

had a problem with the phoneline (no dial tone + internet almost stopped) which is now fixed but i don't think the errors were as high as this before.

here's the stats, connected for 2days 15 hours at this point

Modulation : ADSL2+
Annex Mode : Annex A/L
Line State : up
Lan Tx : 4076716
Lan Rx : 2523325
ADSL Tx : 2271623
ADSL Rx : 3556035
CRC Down : 0
CRC Up : 134
FEC Down : 0
FEC Up : 265
HEC Down : 220
HEC Up : 0
SNR Up : 7.0
SNR Down : 8.3
Line Attenuation Up : 13.0
Line Attenuation Down : 21.4
Data Rate Up : 1131
Data Rate Down : 16008

builder22 · 14 Feb 2016 at 12:36

thanks

it's overhead lines that go to the house - I noticed there are a few branches in contact with the line so when it's windy the line moves with the branches.
I thought that was what was causing the no dial tone fault but it was a fault on the line somewhere on the main road - could the branches have anything to do with the errors?

also - I used to have the stability adjustment set to -2db on the router (Asus N55-U) and it was syncing about 18000 but since the fault was fixed it needs to be set to -3db to keep the SNR figures reasonable

thing is it works and is within the 'acceptable speed range' so just have to accept that's the way it is now?

builder22 · 14 Feb 2016 at 14:05

thanks - another query....

on the BTWholesale speedtest site, for the upload speed the results come back as....

0.83 Mbps Max Achievable Speed
Upload speed achieved during the test was - 0.94Mbps
Additional Information:
Upstream Rate IP profile on your line is - 0.83 Mbps

was wondering if that had anything to do with the 'up' errors, as it's running faster than the max speed?

builder22 · 14 Feb 2016 at 14:21

maybe act as a bad earth or something like that?
do they just trim the trees when they come out or do they have to do something with the connections on the mast/junction box? too

builder22 · 20 Feb 2016 at 10:11

since the last time I posted here I've noticed my sync speed has increased - I haven't altered anything, not even rebooted the router

looking at the Line Data on my ISP's website it shows the noise margin was reset - what exactly does that mean - what does BT do to the signal to allow it to sync higher?

the errors are now much higher too....

this is after 4 days uptime

Modulation : ADSL2+
Annex Mode : Annex A/L
Line State : up
Lan Tx : 14757501
Lan Rx : 8443799
ADSL Tx : 3322990
ADSL Rx : 5797461
CRC Down : 0
CRC Up : 963
FEC Down : 0
FEC Up : 9426
HEC Down : 1477
HEC Up : 0
SNR Up : 6.8
SNR Down : 6.5
Line Attenuation Up : 13.0
Line Attenuation Down : 21.4
Data Rate Up : 1131
Data Rate Down : 17938