This topic

DLM reset

norsenoddy — Sat, 14 Dec 2024 11:30:37 GMT

HI after a bad session of errors and disconnects + an unusable phone line we got it fixed , but 10 days later the DLM has not altered the IP profile even though the line has been stable with low errors . I'm stuck on a 2.7 profile and max down stream is 4700 I know it's not a huge difference but when my connection is so low every little helps . Cheers

Re: DLM reset

Keith_Beddoe — Sat, 14 Dec 2024 12:17:41 GMT

Normally ADSL does recover on its own, as that is what I assume you have. It does require that you do not restart or disconnect your router for at least 10 days.

If after 10 days the connection speed has not improved, then a single disconnection of the DSL input for about 10 seconds, normally causes the connection to re-sync at the correct speed.

The IP profile can take a few days later to improve.

Re: DLM reset

norsenoddy — Sat, 14 Dec 2024 12:38:02 GMT

Well it's had 10 days with out any disconnects but I've got a feeling something is wrong the BT wholesale speed check is giving speed test's from 0 to around 15 which is impossible on my line

Re: DLM reset

Keith_Beddoe — Sat, 14 Dec 2024 12:55:18 GMT

Dry a single disconnect of the DSL input, to force a resync. Do not restart router as that causes a longer disruption.

See if the line connection speed improved.

The BT Wholesale Performance tester, always seems to give odd results on my ADSL connection, so I just use other speed test sites.

I use a TP Link modem/router and find ADSL very stable.

Re: DLM reset

norsenoddy — Sat, 14 Dec 2024 13:04:06 GMT

I use a Billion 7800DXL which has been very good also means I can get all the line stats , but it couldn't do anything about my line shorting on to another unused line ( so the engineer told me ) I'll give it a go , but always nervous with what will happen next on my long EO line ;(

Re: DLM reset

Keith_Beddoe — Sat, 14 Dec 2024 15:20:28 GMT

I am surprised there is an issue on the EO cable, unless its in a joint where the cable pairs split. A contact on the MDF is a possibility, but would be easily found.

EO cables were often used to serve factories, and tend to get re-used if the site is re-developed.

My ADSL connection is about 10Mbs, as I am about 1.5Miles from the exchange. There is VDSL available, however I prefer to have a connection coming from equipment in the exchange (MSAN) which comes from the Essential Services mains supply, as opposed to some batteries in the cabinet, as we do tend to suffer from random power cuts, so I have mains backup at this end.

I assume you have considered 4G mobile broadband, provided you have mobile coverage. I have a 4G router on Three mobile, as an alternative connection, especially if I need a faster upload speed.

Re: DLM reset

norsenoddy — Sat, 14 Dec 2024 15:55:02 GMT

Sounds a lot like my place only I'm 4miles from the exchange , tried EE 4g it was good but the router didn't allow WiFi calling ( stone cottage with very thick walls )

Re: DLM reset

Keith_Beddoe — Sat, 14 Dec 2024 16:15:42 GMT

I have a TP Link TD- W9970 for ADSL and a TP Link TL-MR8400 LTE router for 4G. This is a full featured device which allows port forwarding as well, as I use remote monitoring.

I chose Three Mobile because they offer a routable IPv4 address option, as I do not think EE offer that, which is probably why your Wi-Fi calling did not work, as I think CGNAT (Carrier Grade Network Translation) may prevent it, due to a shared IP address, meaning your network cannot be addressed from the Internet.

For wireless distribution I use the TP Link Deco M4 mesh, with four nodes. I also use TP Link Kasa and Tapo smart devices. Their stuff is very reliable.

Re: DLM reset

norsenoddy — Wed, 08 Jan 2025 17:43:41 GMT

finally tried the 10 seconds disconnect , synced at a slightly higher rate but no IP profile change in 5 days ☹️

Re: DLM reset

norsenoddy — Thu, 16 Jan 2025 09:25:01 GMT

Now 13 days since the new connection and still no reset 😞 IP profile still at 2.7 , are the old exchanges just being ignored now ? so not only do we not get a reasonable speed there appears to be no interest if you are left on the old ADSL line .

Re: DLM reset

Leanne_T — Fri, 17 Jan 2025 08:22:12 GMT

Hi @norsenoddy

Thanks for posting on the community.

I would suggest getting in touch with our technical support guides, they will get this looked into and let you know what is needed to get this sorted.

Thanks.

Leanne 🙂

Re: DLM reset

Keith_Beddoe — Fri, 17 Jan 2025 09:18:22 GMT

@norsenoddy

How are you reading the IP profile, as the BT Wholesale Performance Tester ceased on 10th January, so I wonder if you are just seeing a cached result from your web browser which is no longer valid?

Re: DLM reset

norsenoddy — Fri, 17 Jan 2025 09:34:27 GMT

Interesting I didn't know that , I realised it wasn't doing a correct test , but speed checks from other sites still point to a IP profile of around 2.7 plus max attainable is always around 4800 Kbps but it's stuck at 3071 Kbps .I would've expected an increase by now.

Re: DLM reset

Keith_Beddoe — Fri, 17 Jan 2025 09:51:26 GMT

This page may help https://kitz.co.uk/adsl/IPprofile.htm

For your sync speed of 3071 the IP profile is 2500.

The sync speed is normally below the maximum rate. What is the downstream noise margin and the number of corrected errors (FECs), as I assume that interleaving is on?

Re: DLM reset

Keith_Beddoe — Fri, 17 Jan 2025 09:54:01 GMT

This is what I get.

Basic Status

Device Information

Firmware Version:0.9.1 0.2 v0076.0 Build 170919 Rel.61201n
Hardware Version:TD-W9970 v2 00000000
System Up Time:41 day(s) 01:47:29

DSL

Line Status:Connected

DSL Modulation Type:ADSL_G.dmt.bis

Annex Type:Annex A/L

	Upstream	Downstream
Current Rate (Kbps)	1155	10531
Max Rate (Kbps)	1208	10552
SNR Margin (dB)	7.7	3.1
Line Attenuation (dB)	20.3	33
Errors (Pkts)	0	0

Re: DLM reset

norsenoddy — Fri, 17 Jan 2025 10:43:24 GMT

adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 8000
Last initialization procedure status: 0
Max: Upstream rate = 640 Kbps, Downstream rate = 4732 Kbps
Bearer: 0, Upstream rate = 692 Kbps, Downstream rate = 3071 Kbps

Link Power State: L0
Mode: ADSL2 Annex A
TPS-TC: ATM Mode(0x0)
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 7.6 5.8
Attn(dB): 55.5 35.7
Pwr(dBm): 18.3 12.4

ADSL2 framing
Bearer 0
MSGc: 89 12
B: 10 78
M: 4 1
T: 6 1
R: 16 16
S: 0.4440 3.6019
L: 1081 211
😧 4 8

Counters
Bearer 0
SF: 76028624 917840
SFErr: 726 36
RS: 2244144404 137206
RSCorr: 492440 2345249
RSUnCorr: 12387 0

ReXmt: 1081232 0
ReXmtCorr: 928450 0
ReXmtUnCorr: 12387 0

Bearer 0
HEC: 6914 66
OCD: 622 0
LCD: 622 0
Total Cells: 268094800 1998554520
Data Cells: 978647869 87031913
Drop Cells: 0
Bit Errors: 0 7005

ES: 36817 4511
SES: 1583 267
UAS: 9278 8519
AS: 1222836

Bearer 0
INP: 28.00 2.00
INPRein: 0.00 0.00
delay: 8 7
PER: 15.81 16.20
OR: 48.04 8.88
AgR: 3086.80 699.12

Bitswap: 254/254 288/288

Total time = 510 days 23 hours 51 min 48 sec
FEC: 11066397 511068016
CRC: 130653 6215
ES: 36817 4511
SES: 1583 267
UAS: 9278 8519
LOS: 68 0
LOF: 313 0
LOM: 310 0
Latest 15 minutes time = 6 min 48 sec
FEC: 0 125
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 4 308
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 23 hours 51 min 48 sec
FEC: 1653 25430
CRC: 23 4
ES: 14 4
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 2135 27153
CRC: 52 10
ES: 27 9
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 14 days 3 hours 40 min 35 sec
FEC: 492440 2345249
CRC: 726 36
ES: 378 30
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
>

Re: DLM reset

Keith_Beddoe — Fri, 17 Jan 2025 10:55:33 GMT

Lots of uncorrected errors, so there must be interference on the line. That is keeping the downstream noise margin high, to keep the connection stable.

You may be able to hear the noise on a phone connected to the line, but the chances are its outside of the audible range.

Usual cause is radio frequency pickup on overhead lines, as I assume you are fed overhead.

There is not much you can do about it. A DLM reset would just result in an increase in uncorrected errors, which would very quickly reduce the connection speed again.

Many areas that have very low speed ADSL connections, are being planned for direct fibre, but this is going to take a long time.

Use the address checker on the page below, and post the results, but edit out your address details first, but leave the exchange name and cabinet number showing.

https://www.broadbandchecker.btwholesale.com/#/ADSL
Please include all notes at the bottom.

Re: DLM reset

norsenoddy — Fri, 17 Jan 2025 11:17:59 GMT

thanks for the info , all our lines are underground

Re: DLM reset

Keith_Beddoe — Fri, 17 Jan 2025 11:30:31 GMT

Underground cables can still pick up crosstalk from adjacent pairs, and from within wiring in the cabinet, especially if the pair is unbalanced.

I assume you are not on an EO (Exchange Only) line? That can be found from the link I posted, as there would not be any cabinet number shown.

Re: DLM reset

norsenoddy — Fri, 17 Jan 2025 13:41:12 GMT

Yes it is an EO line still connected to the old exchange