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I just thought I’d keep this thread updated for reference until a mod comes through to remove the banding.
The attainable rate has since been increased to 6400/1300! The SNR ranges from around 8-9dB during the day and 3-4dB at night.
Current rate is still banded at 2270/828.
you are still in banded profile but you not see such a swing in noise margin from 8/9 to 3/4db suggesting there is a line problem and even if mods get you out of banding I just wonder how long it will last before you are back in a banded profiile
Just to update this thread- I seem to still be having problems! I’d like to get in contact with the mods again if possible please @JohnC2 @RobbieMac to request a SNR reset, banding to be removed and for interleaving to be kept on.
Robbie was previously assigned to my case (9/02/18) where he removed the ‘stuck’ banding. Thanks for this Robbie!
After Robbie intervened, my SNR was still fluctuating too extremely on ADSL2 modulation and kept spiking. There was also the same odd inference issue clearly visible on previous SNR graphs.
The SNR spikes have caused a banded profile again!
I have since switched back to G.dmt modulation on my router where the SNR is much more stable, but is at 17dB down / 7dB up. The interference issue on the SNR has also disappeared!
Please could I have the SNR reset and for the banding to be removed so I can monitor the performance further? I think last time interleaving was switched off, could I please request to keep interleaving on as I think fast path was causing further problems?
I’d be very grateful if a mod could help.
Thanks for all help so far
can you post stats from your router
as I said previously if your conenction is not stable resetting noise margin and getting out of banding is pointless as you will just be back where you started in no time you need to find cause of the conenction problems before you are going to make any progress
The only thing that has changed is the broadband being regraded to ADSL2+ and me changing the router modulation to ADSL2 (which caused SNR problems).
I wanted to eliminate any hardware problems first by going back to the original modulation setting (G.dmt) which has been in effect for 6 days with a much more stable SNR. The Upstream is a little odd at a fixed 7dB though!
Other options are a faulty microfilter or faulty router. If I’m right, a faulty microfilter usually shows symptoms of a dialup noise through the phone (which isn’t happening). I don’t think the router is faulty, or well I hope not! It’s only 10 months old!
Quiet line test is still crystal clear and I’ve never heard any noise from frequent tests at various times of day for a few weeks now.
Other things I can think of - there are currently BT/Openreach works going on in my village installing new cabinets and fibre cabling. Maybe something has been disturbed?
Router stats below:
|Line Rate - Upstream (Kbps)||768|
|Line Rate - Downstream (Kbps)||2272|
|Default Gateway / IPv4 Address||pppoa0 (DSL) / 126.96.36.199|
|Connection Time||6 Day(s) 19:16:36|
|Link Power State||L0|
|Line Coding (Trellis)||On||On|
|SNR Margin (dB)||15.6||7.0|
|Output Power (dBm)||18.5||12.5|
|Attainable Rate (Kbps)||5404||960|
|K (number of bytes in DMT frame)||72||25|
|R (number of check bytes in RS code word)||2||8|
|S (RS code word size in DMT frame)||2.00||2.00|
|D (interleaver depth)||8||4|
|INP (DMT symbol)||0.05||0.12|
|Super Frame Errors||9205||1452|
|RS Correctable Errors||27406||37|
|RS Uncorrectable Errors||10258||0|
your still in a banded profile hence the high noise marging - you don't get banded profile on adslmax your up speed still looks like adsl2
have you tried replacing the filter when connected to test socket?
Yep, I went back into a banded profile a few days after Mod help. I think the SNR swings did it and possibly my line couldn’t cope with the interleaving being switched off causing a massive load of errors.
I’m on a recently upgraded ADSL2+ service, however, I’ve changed the router modulation to G.dmt for stability because the ADSL2 and ADSL2+ modes were too unstable and the SNR would fluctuate too much and drop too low. I now don’t get this on G.dmt which is why I want to see if reseting the SNR and banded profile helps.
I haven’t tried replacing the filter just yet because I wanted to keep the line stable to monitor any change. However, I am still connected to the test socket.
Your stats are still very similar to before when you were in banded profile and only changed when mods released the banding
i think you need engineer visit to find out the cause of the large noise margin fluctuations as that is not normal. Until the cause if found and fixed you are not going to get a good speed/connection
To illustrate what I mean.
SNR before mods released banding and ADSL2 modulation ON (manually configured):
SNR 3 days after mods released banding and ASL2 modulation ON (manually configured) with interleaving OFF (BT):
SNR with G.dmt modulation ON (manually configured) and current auto 8/4 interleaving:
The SNR is much more stable with the G.dmt modulation. Each modulation has given completely different noise margins: ADSL2: 9-1dB (and quite often lower!) G.dmt: 17-11db (lowest figure fluctuates from 13-11db from day to day). There is some kind of interference on ADSL2 modulation and the fluctuations are too unpredictable/extreme for my liking, hence why I have manually overridden any auto settings and forced G.dmt.
Can I rule out a micro filter issue based on the above graphs? I have experienced no drops since forcing the modulation back to the G.dmt and the router remains connected to the test socket using the same micro filter.
I’m happy for an engineer to visit but I got charged for a visit last year where the fault wasn’t proven to be with my home wiring!
Is a mod able to test for any faults on my line please?