This topic

Need my DLM/SNR reset after duff rouuter caused multiple resets

pembssurf — Wed, 13 Jan 2021 17:23:38 GMT

Hello Im on broadband Fibre 2 and have always achieved speeds of near the max 79 down and 19 up as iI live right across the road from the cabinet. Anyway to cut a long story short I thought i had a line problem in the weeks leading up to Christmas, i was getting slow speeds and fairly regular disconnects and also WIFI disconnects. Anyway it turns out it wasn't my line but my old router. I tried using my backup HH5 and it worked fine but with rubbish 5ghz (standard i know). Anyway i have gone out and purchased an TP_Link Archer VR2800 which although getting on is still one of the fastest and quality routers at 5ghz. However i have now noticed that my modem stats now show the following:

Line Status:
Connected
DSL Up Time:
0 days 1 hours 11 minutes
DSL Modulation Type:
VDSL2
Annex Type:
Annex A/L

Upstream Downstream

Current Rate (kbps)	20000	73998
Max Rate (kbps)	28698	130156
SNR Margin (dB)	11.1	21.6
Line Attenuation (dB)	9.9	6.1
Errors (pkts)	0

My download speed is 14mb off where it used to be and its fairly obvious my SNR is way too high especially on the downstream which is why my connect rate is currently 73998 and my download speed is maxing out at 64mb. How do I go about getting a SNR/ DLM or full profile reset as I am 99.9% sure the originally issue of a faulty modem rebooted caused this in the first place. BT on the helpline were next to useless on this matter.

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

licquorice — Wed, 13 Jan 2021 17:24:32 GMT

If the line remains stable, DLM will do its stuff and restore your speed.

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

pembssurf — Wed, 13 Jan 2021 17:45:50 GMT

Ok I guess we are talking a couple of weeks of retraining then?

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

licquorice — Wed, 13 Jan 2021 17:48:48 GMT

Probably, might be slightly longer.

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

pembssurf — Fri, 22 Jan 2021 09:21:28 GMT

Well internet disconnected over night night before last on 9th day of solid connection. And has reconnected back at 79999 up from 73999 and download speed as increased to around 69/70mb. Still 4-5mb short of where I was but heading in the right direction. Interestingly SNR is still 20 so that has a fair way to drop yet. On a side note the new TP-Link Archer VR2800 is a world away better than its newer replacement VR2100 if anyone’s in the market.

the VR2100 kept dropping WiFi signal on both bands left right and centre even with fixed channels but this one works perfectly and had vastly increased signal strength on both frequencies.

Still wouldn’t mind a SmartHub 1 as a solid backup.

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

pembssurf — Tue, 26 Jan 2021 09:26:52 GMT

Another update. All is not 100% well I fear, starting to get disconnects every morning around 2am. Would this be DLM? Either way it’s now happened 3 days in a row resulting in my longest connection being 22 hours. This also buggered up my router when I woke up refusing to connect anything on WiFi which required a further reboot to solve. Exactly the same symptoms on 3 different routers but BT are telling me the line is fine?

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

Gary_C — Wed, 27 Jan 2021 04:52:14 GMT

This was an interesting insight into the DLM process posted by one of the old hands in another thread
https://community.plus.net/t5/Library/FTTC-DLM-What-it-is-How-it-works/ba-p/1322799

Looks like resets at about 3-5am are signs of the DLM tinkering 🙂

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

matekaneve — Wed, 27 Jan 2021 08:10:04 GMT

When I was on FTTC and I had a fault, an engineer fixed the line, has done a dlm reset and after about 3-4 days of stable connection the hub6 started rebooting every night about 1am. It went on for about a week then it stopped and this resulted me going back up to my full speed. If your router reboots at about the same time every night it must be the DLM is doing it's trick. Keep checking the stats to see if you notice any difference in terms of connection speed as well as download speed. Also try NOT to do any manual resets/reboots, just leave the router on at all times. 🙂

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

pembssurf — Wed, 27 Jan 2021 13:11:30 GMT

Thank you this all makes sense. My speed has indeed gone up and sitting around 72mb download do just a few mb off where it was. Interestingly SNR is still stubbornly high at 19.8db but not at the high of 21 it was last week.

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

imjolly — Wed, 27 Jan 2021 13:16:28 GMT

@pembssurf

as your attainable speed is well above the max attainable of 80mb you will always have a high noise margin unless the 80mb fibre 2 cap is removed

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

pembssurf — Thu, 04 Feb 2021 10:24:38 GMT

Ok so still some weird going’s on. Last disconnect was 5 days ago now and for the past 5 days my SNR has shot up on both uplink and downlink. Upstream is now 15.4 downstream is 19.9

was sitting pretty at 6db and 9db reflectively before this.

Upstream current rate in last connection is still 19999

downstream is 79999

actual speeds are only a few mb off where they should be on download and actually bang on for upload. I just can LTV for the life of me figure out why my SNR continues to increase.

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

imjolly — Thu, 04 Feb 2021 10:28:29 GMT

so your speed is now back to the max 80/20 for fibre 2

as I posted before your high noise margin is good and is due to the large difference between your attainable speed and your actual speed nothing to worry about

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

pembssurf — Thu, 04 Feb 2021 10:34:06 GMT

Ok I’m with you now. So basically living close to the cabinet I can expect these high SNR profiles as long as my actual speed is stable and good then?

Bit of a newb when it comes to this and trying to become an expert overnight by the power of Google. Thanks for the help!

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

imjolly — Thu, 04 Feb 2021 10:37:00 GMT

@pembssurf wrote:
Ok I’m with you now. So basically living close to the cabinet I can expect these high SNR profiles as long as my actual speed is stable and good then?

yes being so close and with good line your attainable is great and should BT ever increase the max from 80mb you would be in a great place

Re: Need my DLM/SNR reset after duff rouuter caused multiple resets

licquorice — Thu, 04 Feb 2021 10:49:05 GMT

SNR is actually a misnomer, the figure shown is actually the SNRM (signal to noise ratio MARGIN) which is an indication of how much margin you have before the actual SNR becomes a problem.