This topic

BT refusing to uncap connection (Not DLM)

DiscoDave1 — Sun, 10 Mar 2024 10:53:14 GMT

Despite having an attainable speed of ~46Mb my connection seems to be artificially capped at exactly 35Mb (Modem shows sync rate of 35000Kbit/sec).

BT support state that DLM has not been applied and that it's the maximum my package can deliver, yet I cannot upgrade.

Are there any options to remove this cap?

Re: BT refusing to uncap connection (Not DLM)

licquorice — Sun, 10 Mar 2024 10:57:35 GMT

Can you post a screenshot of your hub stats. If your download speed is exactly 35M, it is almost certainly due to DLM banding your connection.

Re: BT refusing to uncap connection (Not DLM)

Les-Gibson — Sun, 10 Mar 2024 10:58:07 GMT

I very much doubt that there is any cap to remove, more likely is that your cabinet is congested.

Re: BT refusing to uncap connection (Not DLM)

Keith_Beddoe — Sun, 10 Mar 2024 11:02:37 GMT

@DiscoDave1

Take a look at this link, I would expect that DLM has put you into one of those bands.

https://community.plus.net/t5/Library/FTTC-DLM-What-it-is-How-it-works/ba-p/1322799

You will never get the max available speed, as there are things like error correction, and other overheads.

Re: BT refusing to uncap connection (Not DLM)

licquorice — Sun, 10 Mar 2024 11:07:59 GMT

@Les-Gibson it won't be 'cabinet congestion'

Re: BT refusing to uncap connection (Not DLM)

Anonymous — Sun, 10 Mar 2024 11:29:10 GMT

What package are you subscribed to?

35Mb is the cap for the lowest speed FTTC Essentials package. If you're on Fibre 1 or higher then it's possible that you're on the wrong profile.

Re: BT refusing to uncap connection (Not DLM)

DiscoDave1 — Sun, 10 Mar 2024 12:18:53 GMT

I'm on "Fibre with halo 1" with no upgrade options

Re: BT refusing to uncap connection (Not DLM)

Keith_Beddoe — Sun, 10 Mar 2024 12:23:50 GMT

Then your line will not support a higher speed, as you are too far away from the cabinet.

If you post your connection information as requested, then that may give a better idea.

Re: BT refusing to uncap connection (Not DLM)

-Richie- — Sun, 10 Mar 2024 12:41:03 GMT

@Anonymouswrote:
What package are you subscribed to?
35Mb is the cap for the lowest speed FTTC Essentials package. If you're on Fibre 1 or higher then it's possible that you're on the wrong profile.

40/10 is the SLT for Essentials, there is no 35 cap
55/10 is Fibre 1
80/20 is Fibre 2

Re: BT refusing to uncap connection (Not DLM)

licquorice — Sun, 10 Mar 2024 12:47:53 GMT

The line is banded by DLM, simples.

Post the stats which will confirm that.

Re: BT refusing to uncap connection (Not DLM)

DiscoDave1 — Sun, 10 Mar 2024 12:48:52 GMT

I'm not at home ATM but as per the op my attainable rate is about 45mb, synced at exactly 35000kbit/sec currently

Re: BT refusing to uncap connection (Not DLM)

DiscoDave1 — Sun, 10 Mar 2024 12:52:30 GMT

Why does my attainable speed indicate the contrary?

Re: BT refusing to uncap connection (Not DLM)

licquorice — Sun, 10 Mar 2024 12:52:02 GMT

However, until the cause of the DLM banding is investigated and fixed, there is no point in a reset as it will just ened up being banded again.

Re: BT refusing to uncap connection (Not DLM)

licquorice — Sun, 10 Mar 2024 12:55:42 GMT

@Keith_Beddoe the op has an attainable rate of 45, not a predicted rate of 45M by the checker.

Re: BT refusing to uncap connection (Not DLM)

Anonymous — Sun, 10 Mar 2024 13:44:54 GMT

@-Richie-wrote:
40/10 is the SLT for Essentials, there is no 35 cap

I obviously misremembered & stand corrected.

Re: BT refusing to uncap connection (Not DLM)

DiscoDave1 — Sun, 10 Mar 2024 14:16:33 GMT

@licquorice- Stats:

# xdslcmd info --show xdslcmd: ADSL driver and PHY status Status: Showtime Retrain Reason: 0 Last initialization procedure status: 0 Max: Upstream rate = 10436 Kbps, Downstream rate = 43160 Kbps Bearer: 0, Upstream rate = 9999 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): 8.9 5.5 Attn(dB): 21.9 0.0 Pwr(dBm): 13.1 6.7 VDSL2 framing Bearer 0 MSGc: -6 -6 B: 73 105 M: 1 1 T: 0 0 R: 6 14 S: 0.0666 0.3367 L: 9610 2851 D: 8 8 I: 80 120 N: 80 120 Q: 8 8 V: 5 1 RxQueue: 130 18 TxQueue: 26 6 G.INP Framing: 18 18 G.INP lookback: 26 6 RRC bits: 24 24 Bearer 1 MSGc: 90 58 B: 0 0 M: 2 2 T: 2 2 R: 16 16 S: 10.6667 16.0000 L: 24 16 D: 1 1 I: 32 32 N: 32 32 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 0 OHFErr: 1 18 RS: 2442173688 1947481 RSCorr: 34397 23809 RSUnCorr: 0 0 Bearer 1 OHF: 7010614 746606 OHFErr: 0 0 RS: 42063315 2382446 RSCorr: 9 22 RSUnCorr: 0 0 Retransmit Counters rtx_tx: 74340130 574 rtx_c: 1222 18651 rtx_uc: 13 52131 G.INP Counters LEFTRS: 0 264 minEFTR: 34999 9997 errFreeBits: 60119261 83399377 Bearer 0 HEC: 0 0 OCD: 0 0 LCD: 0 0 Total Cells: 3284352020 0 Data Cells: 984579997 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: 1 6 SES: 0 0 UAS: 26 26 AS: 112610 Bearer 0 INP: 54.00 45.00 INPRein: 1.00 0.00 delay: 0 0 PER: 0.00 0.00 OR: 0.01 0.01 AgR: 35418.64 10034.33 Bearer 1 INP: 2.50 4.00 INPRein: 2.50 4.00 delay: 0 0 PER: 16.06 16.06 OR: 47.81 31.87 AgR: 47.81 31.87 Bitswap: 57395/57395 7342/7361

Re: BT refusing to uncap connection (Not DLM)

licquorice — Sun, 10 Mar 2024 14:33:07 GMT

SNRM 8.9 and exactly 35M, definitely been banded by DLM.

Have you been getting drop outs of broadband, do you have a phone? Check for noise on quiet line test 17070 unless you are on DV.

Re: BT refusing to uncap connection (Not DLM)

DiscoDave1 — Sun, 10 Mar 2024 14:44:45 GMT

Love it when BT support frequently and outright lies to customers.

No noise on the line, connection stable. Can go weeks without a DC

Re: BT refusing to uncap connection (Not DLM)

imjolly — Sun, 10 Mar 2024 14:49:03 GMT

unfortunately your stats don't show anytime for system uptime or more importantly connection uptime. you must have had connection problem with internet dropping or/and manual reset trying to improve connection for DLM to take action and put connection in banded profile