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Author Topic: Have you got a line which is capped by DLM?  (Read 15470 times)

kitz

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Have you got a line which is capped by DLM?
« on: April 21, 2016, 05:05:00 PM »

Something of which Ive only recently become aware of is the increasing number of people whose line has been banded by the FTTC DLM and it may be a larger number than we originally thought.

There's been a lot of 'me too' names and impossible to track over various threads, so ...

If you have been banded and your line is now stable can you please add below:

1) The speed rate at which you are banded.
2) Your max attainable rate
3) How long your line has been banded for.
4) If there was a trigger for the banding do you know what caused it and how long has it now been fault free.
5) A short summary of any additional info that may be relevant.

Your line must now be perfectly fine,  restricted only by a DLM cap and capable of performing at a higher rate.

Please do not litter this thread with off topic posts, if there is an issue that needs more discussion, start a separate thread with more details and put a link to it in your post.  I need to keep this thread clean and just trying to find out how widespread this problem is at the moment.

TIA.


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William Grimsley

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Re: Have you got a line which is capped by DLM?
« Reply #1 on: April 21, 2016, 05:07:08 PM »

I'll start!

1) Downstream Rate: 34998 - 35000 Kbps.
2) Downstream Attainable Rate: 43500 - 46100 Kbps.
3) Nearly 3 months.
4) Maintenance of a BT Home Hub 5 (Type B) causing nearly 40 disconnects over the course of a few days.
5) Upgraded to the new BT Infinity 1 package "up to 52 Mbps" package on Monday, this did not cause a full DLM reset.
« Last Edit: April 22, 2016, 07:44:47 AM by William Grimsley »
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Dave2150

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Re: Have you got a line which is capped by DLM?
« Reply #2 on: April 21, 2016, 05:15:55 PM »

I managed to get a DLM reset two days ago to remove my banding. Link to thread explaining everything: http://forum.kitz.co.uk/index.php/topic,16949.0.html

I'll enter my stats below, feel free to delete my post if you feel it's not appropriate since my banding was removed via DLM reset 2 days ago.

1. 27,400kbps
2. 37,880kbps
3. Four months
4. I believe the HH5B was responsible for the instability on my line. I used it for the first few days when I swapped from Sky to BT but it was quite unstable, then proceeded to continue using my trusty HG612
5. Managed to get  DLM reset by explaining via live chat that my line was banded and was running at 11DB SNR. The support agent booked me an boost engineer immediately. Only thing this boost engineer did was to order a DLM reset.
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licquorice

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Re: Have you got a line which is capped by DLM?
« Reply #3 on: April 21, 2016, 05:22:39 PM »

1. 34999kbps
2. 44300 - 46200kbps
3. 45 days
4. A short period of severe instability which righted itself without intervention
5. Upgrade to new Infinity 1 cap had no effect on banding but removed G.Inp and introduced interleaving on 19th April. Interleaving removed 21st April SNRm 9.3dB.  All stats from before  banding to present viewable on MDWS user majorca72
« Last Edit: April 21, 2016, 05:31:59 PM by licquorice »
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AArdvark

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Re: Have you got a line which is capped by DLM?
« Reply #4 on: April 21, 2016, 07:18:07 PM »

1) Currently Banded at 60000/20000. Prior to this I have been banded at 66999/20000 for 2-3(???) months after last BTO Engineer visit.
 
2) Max Attainable has been 70xxx+ since BTO Engineer visit. Voice fault (Faulty Linecard replaced.) fixed 13/04/2016 Max Attainable increased to 72xxx+.

3) Since 31-03-2016 13:20 local time (+/- 1 minute). [Reason: 1 Remote Defect Indicator/DLM] 

4) Some weeks prior the power was lost to the town due to 'Digger issues' :).
    The power had 'bounced a few times after the fix.
    Also had difficulty getting PPP session that required multiple Power cycles of the router to get a PPP session established.
    I suspect the multiple power losses eventually triggered DLM to intervene.

5) Full details of fault are noted in the following Plusnet Forum Post:
    https://community.plus.net/t5/Fibre-Broadband/Yet-another-Happy-Customer-with-plummeting-Linespeeds-Thanks/td-p/1325539

    In a nutshell:
    At 31-03-2016 13:20 local time (+/- 1 minute) the router re-synced and the speed dropped to 60000/20000 from 66999/20000.
    I waited 10+ Days before raising the fault Ticket to allow for DLM possibly fixing the problem.
    Fault Ticket raised on 13/04/2016
    Voice fault raised with BT & fixed at exchange within 1-1.5 hrs ??? [Blinding speed by Plusnet/BT  ;D ;D]
    [Linecard replaced at exchange, as confirmed to me by the BT Engineer via Telephone call.]
    DLM did not change the sync at all.
    It has been at the quoted speed since.
   
    The latest GEA Test on the line shows:
    Voice Line Test Result Pass
    Bridge Tap Not Detected
    Radio Frequency Ingress Not Detected
    Repetitive Electrical Impulse Noise Not Detected
    Cross Talk Not Detected
    Estimated Line Length In Metres 463.2
    Upstream Rate Assessment Very Good
    Downstream Rate Assessment Reasonable
    Interference Pattern Not Detected
    Service Impact No Impact Observed
    Home Wiring Problem Not Detected

   According to a Plusnet CSC Analyst " ... there is no DLM system on Fiber only ADSL."  :-X :-X :o

I am now waiting a further 5 days to see if DLM re-syncs the line somewhere near the speed it should be capable of.

[I am following the suggested '10 Day' settling in period for DLM, after the Linecard [Voice] has been changed on my line at the Exchange.]

Max Attainable has increased on the line but I am still capped at 60000/20000.

The only thing DLM has done is the remove G.INP off the upstream at 08:12 15/04/2016.

Quote from: Black Sheep
Aardvark .................... the voice fault that was subsequently cleared at the Exchange, will have no bearing whatsoever on your FTTC broadband and DLM intervention.  :)
« Last Edit: April 22, 2016, 06:46:31 PM by burakkucat »
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daveesh1

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Re: Have you got a line which is capped by DLM?
« Reply #5 on: April 21, 2016, 08:38:02 PM »

First time I was Banded

1. 28500

2. 40000-43000

3. 3 Weeks

4. Tried the Asus DSL N55U kept dropping connecting.

Went back on ECI modem and Homehub 3. Eventually BT sent out Boost engineer who moved Master Socket and DLM Reset

Second Time

1. 32999
2. 43000 - 47000
3. 7 Days
4. Again another new Modem this time Linksys x6200 kept rebooting. Upgrade to new Infinty 1 package expecting DLM reset. Full reset didn't happen just  G.inp removed. Spoke to BT on line chat engineer attended same day ( don't ask I have no idea just turned up that afternoon) DLM reset and pair swap back to cab
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ardsar

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Re: Have you got a line which is capped by DLM?
« Reply #6 on: April 21, 2016, 09:22:27 PM »

1) 22400
2) Approx 33000
3) 12+ months
4) original trigger was using the asus modem router which was extremely unstable on my line.
5) I do suffer from interference at night and s/n drops by around 1.5 db. Occasionally I will see a sudden drop of around 1 db for an hour or so then it will step back up - usually in early hours of the morning.


Sent from my iPhone using Tapatalk
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loonylion

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Re: Have you got a line which is capped by DLM?
« Reply #7 on: April 21, 2016, 10:22:03 PM »

1) 43999
2) currently 46396 but I've seen higher, as high as in the 49xxxs
3) a hell of a long time, at least a year (from a post I found it could be coming up on 2 years).
4) I think it was caused by the ECI modem I was originally supplied with
5) my DS SNRM varies between 7 and 9.

if vectoring and/or 3dB target come to my cab I will absolutely want this removed.
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Ragnarok

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Re: Have you got a line which is capped by DLM?
« Reply #8 on: April 21, 2016, 10:45:57 PM »

1st banding.

1) 67 mbps
2)  74-77mbps
3) 15 months+
4) Slow incremental flooding of an underground cable starting way back in probably before 2012 with a old joints needing replacing on my line but the engineer tried to get capacitance of my line in tolerance but could not find the issue in 2012, got FTTC in august 2013 with full 80mbps sync, It descended to 54mbps as the line got worse very progressively, it was fixed in late summer 2014 when it finally killed my neighbors phone line.
5) My line also had interleaving at the time, I needed a Lantic modem to get back to fast path. I also had a no dial tone fault in mid 2015 due to a faulty line card, I also reported slow broadband too in hope of getting a DLM reset. even with the fix of an existing fault he wouldn't do it.



2nd banding.

1)  60mbps
2) 74-77mbps
3) since early jan 2016, 4th month and counting
4)  a day after a flooded joint fault was fixed it at the turn of 2016 , my line was down at 15-30mbps during that fault with no dial  no dial tone, it did jump back upto 67mbps after the fault was fixed then the 60mbps banding kicked in over night.
5) I asked for a DLM reset the engineer wasn't sure what I meant, was not a broadband engineer,never entered my home and didn't do it.  My line is on fast path with an Lantiq modem. I'm on An ECI cab, my line currently sits with a 9.5-10db noise margin, 51 days and counting without a resync. I have given up rebooting every month and hoping the banding gets removed, average errored seconds per day stands at 150 since the last resync, so the line should be a solid green for DLM.

Edit: now on 5693609s or 65.9 days uptime about to hit 66 days of no resyncs sub 250es ( average 150es ) per day probable solid green status, with no DLM relenting intervention.
« Last Edit: May 06, 2016, 01:51:07 PM by Ragnarok »
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jack21

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Re: Have you got a line which is capped by DLM?
« Reply #9 on: April 22, 2016, 07:10:06 AM »

1) 34999
2) 39800
3) 63 days
4) I powered down my Billion 8800 for 10 hours overnight after I found it unresponsive at 9pm. At power-on it was seen to be banded.
5) Suspect faulty street light. Prior week had bursts of snrm downspiking at lighting-on time. It appeared to be fixed a few days later.
     After powering-on router, 34999 band was seen, downstream INP had increased from normal 47 to 54 and upstream INP was applied at 44
    2 days later the d/s INP reverted to 48, interleaving raised from 8 to 16 and upstream INP  was removed.
    D/s ES rates usually between 0 and 1 per hour, u/s ES rates between 1 and 5 per hour.
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Codescribe

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Re: Have you got a line which is capped by DLM?
« Reply #10 on: April 22, 2016, 02:23:38 PM »

1) 59993, 60000 after G.INP applied
2) No idea have Sky Q Hub (with no stats)
3) Since Feb 2015
4) Work on the house, electric on and off at different times.  Modem disconnected whilst hall was plastered.
5) I am on an ECI cabinet. At the time of banding I had an Openreach ECI modem connected to the Sky Hub SR101.  I am currently running the new Sky Q hub without any separate modem.  I believe that G.INP was applied on 30th March as my latency went from 20ms to 12ms (has been 20ms for the whole time I have had FTTC) and my downstream SNR is between 9.2 and 9.6.  BT dsl checker puts the clean line sync achievable between 69.1 and 53.6 (This estimate actually went up a few months ago as it was always 66 before).
« Last Edit: April 22, 2016, 02:27:18 PM by Codescribe »
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tomr

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Re: Have you got a line which is capped by DLM?
« Reply #11 on: April 22, 2016, 03:36:02 PM »

I joined to add my details to this thread

1) 34999
2) 39400
3) 13 months
4) Faulty modem power supply connector caused modem to keep powering off and on. Repaired by myself, now fault free for 13 months.
5) After the fault SNRm was increased to around 12db, after a few days fault free dropped to around 10db, then after about 3 months dropped to just under 9db and has remained there. I've had a couple of online chats with BT help line who have told me categorically the line is not banded, and that their systems clearly show no banding, though on one occasion it was said maybe 'wholesale' have capped the line. I was told to get an engineer out would definitely be chargeable and no guarantee that anything would change.

I'm not really so bothered as I don't think I would notice any change, more of an academic exercise for me, but thought I'd add my line to your thread.

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PEdmunds

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Re: Have you got a line which is capped by DLM?
« Reply #12 on: April 22, 2016, 05:01:12 PM »

1) 39999
2) 48850
3) 3 months
4) electrical work possibly
5) Awaiting outcome of input from Exec Level Complaints
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gazaai

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Re: Have you got a line which is capped by DLM?
« Reply #13 on: April 23, 2016, 12:07:02 PM »

1) 66999
2) 71000
3) 2 Months
4) I used to resync my modem every time a cross talker was removed to try and achieve a higher sync rate, which may have something to do with it.
5) G.INP was applied to the upstream for around two days along with a 66999 sync rate, the g.inp was then removed for no reason from the upstream then the sync rate has stayed the same for two months.
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ktz392837

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Re: Have you got a line which is capped by DLM?
« Reply #14 on: April 26, 2016, 11:02:23 AM »

1) 62026 / 6.0db
2) 65096 / 6.0db
3) approximately 4 weeks
4) Ginp was applied to line
5) Still got Ginp enabled but even with full resyncs with 30m waits will not connect anywhere near attainable rate.  Used to get approximately 600-700 DS ES/day bit since Ginp I get none.  Upstream still 200/day.
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