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Stuck on DLM Profile

DiscoDave1 — Thu, 23 Dec 2021 14:26:55 GMT

Hi,

After a power cut I got put on a 35Mbit down / 10Mbit up DLM band. Been 4 weeks or so without any issues but I can't seem to budge out of DLM. Phone line test for noise is fine, spoken to BT online who say there's nothing wrong with the line, but DLM still won't come off my connection.

Any ideas what to try next?

Thanks,

Re: Stuck on DLM Profile

licquorice — Thu, 23 Dec 2021 14:30:39 GMT

Patience, unfortunately. It can take months for DLM to release banding. There may not be any audible noise but there may still be an impairment to your line causing errors.

Re: Stuck on DLM Profile

DiscoDave1 — Tue, 22 Feb 2022 10:13:00 GMT

BT state there's nothing wrong with my line but still on a DLM band 2 months after, sadly.

Re: Stuck on DLM Profile

PaddyB — Tue, 22 Feb 2022 10:44:46 GMT

Hi @DiscoDave1,

Thank you for posting. I'm sorry if your connection has been banded. You should have seen the banding lift as long as the connection has been stable. Are you seeing any disconnections?

To get a better understanding of what is happening with your connection, please could you post your router stats?

If you are using the BT Smart hub you can get your connection stats by, Opening a new web browser on your connected device and type 192.168.1.254 or bthomehub.home into the address bar. This will open the Hub Manager. Click ‘Advanced Settings’ and then ‘Technical log’.

Thanks,

Paddy

Re: Stuck on DLM Profile

DiscoDave1 — Tue, 22 Feb 2022 11:26:02 GMT

Hi@PaddyB

Not noticing many disconnects. Stats:

xdslcmd info --stats xdslcmd: ADSL driver and PHY status Status: Showtime Retrain Reason: 1 Last initialization procedure status: 0 Max: Upstream rate = 8936 Kbps, Downstream rate = 38868 Kbps Bearer: 0, Upstream rate = 8936 Kbps, Downstream rate = 35000 Kbps Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps Link Power State: L0 Mode: VDSL2 Annex B VDSL2 Profile: Profile 17a TPS-TC: PTM Mode(0x0) Trellis: U:ON /D:ON Line Status: No Defect Training Status: Showtime Down Up SNR (dB): 7.4 6.2 Attn(dB): 22.4 0.0 Pwr(dBm): 13.1 5.8 VDSL2 framing Bearer 0 MSGc: -6 26 B: 73 237 M: 1 1 T: 0 38 R: 6 16 S: 0.0666 0.8460 L: 9610 2402 D: 8 1 I: 80 127 N: 80 254 Q: 8 0 V: 5 0 RxQueue: 132 0 TxQueue: 33 0 G.INP Framing: 18 0 G.INP lookback: 31 0 RRC bits: 0 24 Bearer 1 MSGc: 90 -6 B: 0 0 M: 2 0 T: 2 0 R: 16 0 S: 10.6667 0.0000 L: 24 0 D: 1 0 I: 32 0 N: 32 0 Q: 0 0 V: 0 0 RxQueue: 0 0 TxQueue: 0 0 G.INP Framing: 0 0 G.INP lookback: 0 0 RRC bits: 0 0 Counters Bearer 0 OHF: 0 447691 OHFErr: 291 2431 RS: 3274166136 1841298 RSCorr: 8685452 80382 RSUnCorr: 0 0 Bearer 1 OHF: 34691984 0 OHFErr: 0 0 RS: 208151533 0 RSCorr: 98 0 RSUnCorr: 0 0 Retransmit Counters rtx_tx: 692961631 0 rtx_c: 349338 0 rtx_uc: 243624 0 G.INP Counters LEFTRS: 564 0 minEFTR: 34989 0 errFreeBits: 1815722897 0 Bearer 0 HEC: 0 0 OCD: 0 0 LCD: 0 0 Total Cells: 3145176163 0 Data Cells: 492320868 0 Drop Cells: 0 Bit Errors: 0 0 Bearer 1 HEC: 0 0 OCD: 0 0 LCD: 0 0 Total Cells: 0 0 Data Cells: 0 0 Drop Cells: 0 Bit Errors: 0 0 ES: 468 2309 SES: 46 351 UAS: 70 51 AS: 557247 Bearer 0 INP: 52.00 0.00 INPRein: 1.00 0.00 delay: 0 0 PER: 0.00 8.06 OR: 0.01 31.73 AgR: 35418.64 8967.74 Bearer 1 INP: 2.50 0.00 INPRein: 2.50 0.00 delay: 0 0 PER: 16.06 0.01 OR: 47.81 0.01 AgR: 47.81 0.01 Bitswap: 275886/275886 5340/5357 Total time = 1 days 21 hours 49 min 20 sec FEC: 34919683 689592 CRC: 3680 16434 ES: 468 2309 SES: 46 351 UAS: 70 51 LOS: 1 0 LOF: 10 0 LOM: 4 0 Latest 15 minutes time = 4 min 20 sec FEC: 3395 0 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: 11512 2 CRC: 0 1 ES: 0 1 SES: 0 0 UAS: 0 0 LOS: 0 0 LOF: 0 0 LOM: 0 0 Latest 1 day time = 21 hours 49 min 20 sec FEC: 1161543 5319 CRC: 29 178 ES: 7 31 SES: 0 3 UAS: 0 0 LOS: 0 0 LOF: 0 0 LOM: 0 0 Previous 1 day time = 24 hours 0 sec FEC: 2659344 14161 CRC: 36 400 ES: 11 51 SES: 0 6 UAS: 0 0 LOS: 0 0 LOF: 0 0 LOM: 0 0 Since Link time = 6 days 10 hours 47 min 25 sec FEC: 8685452 80382 CRC: 291 2431 ES: 58 389 SES: 4 45 UAS: 0 0 LOS: 0 0 LOF: 0 0 LOM: 0 0 #

Stats recorded 22 Feb 2022 11:26:14 DSLAM type / SW version: BDCM:0xa4a1 (164.161) / v0xa4a1 Modem/router firmware: AnnexA version - A2pv6C038m.d24j DSL mode: VDSL2 Profile 17a Status: Showtime Uptime: 6 days 10 hours 49 min 27 sec Resyncs: 0 (since 22 Feb 2022 11:21:12) Downstream Upstream Line attenuation (dB): 22.4 0.0 Signal attenuation (dB): Not monitored Connection speed (kbps): 35000 8936 SNR margin (dB): 7.4 6.2 Power (dBm): 13.1 5.8 Interleave depth: 8 1 INP: 52.00 0 G.INP: Enabled Not enabled Vectoring status: 5 (VECT_UNCONFIGURED) RSCorr/RS (%): 0.2648 3.3375 RSUnCorr/RS (%): 0.0000 0.0000 ES/hour: 0 0

Re: Stuck on DLM Profile

imjolly — Tue, 22 Feb 2022 11:52:43 GMT

the connection time is only 6 days suggesting possible drops in connection or was it manual reset if you have banded profile removing it will only increase speed by 1/2 mb as attainable is only 38mb

Re: Stuck on DLM Profile

DiscoDave1 — Tue, 22 Feb 2022 14:43:59 GMT

I think for that example it may have been a manual reset.

When I've not been banded I've sync'd at circa 43Mbit

Re: Stuck on DLM Profile

imjolly — Tue, 22 Feb 2022 15:08:26 GMT

at present your stats show attainable at 38mb and this is not affected whether banded or not

any manual reset restarts your waiting time for DLM to lift banding

Re: Stuck on DLM Profile

licquorice — Tue, 22 Feb 2022 15:23:15 GMT

I could be wrong, but I think attainable rate is predicated on an SNRm of 6dB, so if 3dB margin is available actual rate would be higher than the predicted attainable if you see what I mean.

That is certainly the case with my line.

I am currently banded at 49 (again!!) with a max of 55, but when DLM is reset and 3dB margin kicks in, my actual is about 63.

Re: Stuck on DLM Profile

DiscoDave1 — Mon, 21 Mar 2022 14:18:31 GMT

Weirdly, I had it in the past where my synchronised rate is a higher than my attainable, according to my Openreach modem.

27 days of solid uptime and still on DLM

Re: Stuck on DLM Profile

DiscoDave1 — Sat, 25 Jun 2022 08:50:11 GMT

Been another 3 months and I'm still banded. Is there a way for BT to confirm why the banding is in effect?

Re: Stuck on DLM Profile

imjolly — Sat, 25 Jun 2022 08:53:55 GMT

can you post current router stats including internet uptime not system uptime