FTTC dlm guide and barrier
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- Re: FTTC dlm guide and barrier
FTTC dlm guide and barrier
26-05-2014 11:12 PM
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The question is can we get the barrier information made available in our control panel?
Ideally line green or red status as well.
Re: FTTC dlm guide and barrier
27-05-2014 2:17 AM
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Re: FTTC dlm guide and barrier
27-05-2014 8:40 AM
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I have a question about DLM might sound silly but here goes.
Ok take my line for instance, been great for over 30 old days have had no problems best its been syncing at 74 and now cause some machine thinks i have a problem or had a problem its starts disconnecting me and knocks my speed down, doubles my ping and whatever else it does.
Now surely if there was or had been a problem i would of noticed this, by loosing connection or surfing problems/ gaming etc etc... .
So why cant it just leave it alone till there`s been i don`t know major problem or whatever , because i havn`t seen/noticed any problems, now am no expert long way off but to me there`s been nothing wrong here.
Yes i know it`s there to keep your line up and running and stable if people have problems, but it just so annoying if everything thing seems fine and then starts messing on that`s how i see it anyway .
Ok think i got my question/point out hope it doesn`t sound silly
Thanks
Andy.....
Re: FTTC dlm guide and barrier
27-05-2014 9:04 AM
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@chrcoluk & goldenfibre - When we get access to this information from our suppliers (something that they're working on) it's something that we'll look at - I can promise that it'll be something we can provide as it's only something that will be displayed when we run a Line Test. we'll certainly consider this though
@xxandy77xx - The disconnections you've experienced either yesterday or Saturday as shown below are the probably reasons for your speed drop:
<img src="http://community.plus.net/visualradius/generated/image14011772164831.png"/>
The line has probably seen a large burst of errors, more than the line can handle, and as a result, it looks as though the connection has dropped a few times. Interleaving has been switched to High to handle the errors that were visible on your line. In this instance, it looks as though DLM has acted to stabilise your line in this case.
Re: FTTC dlm guide and barrier
27-05-2014 11:49 AM
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Thanks for the graph, now this is the part i don`t understand, because dlm had already kicked in last week before any of those on sunday and i had no disconnections no problems or any thing apart from last wednesday early morning , then speeds started to drop from there. So to me its acted with no reason at all, but obviously its done it for a reason but i`ve been online over 30 days i left everything alone everything was perfect then its goes and mucks things up. Hope you understand what i mean lol .
Thanks
Andy.....
Re: FTTC dlm guide and barrier
27-05-2014 11:55 AM
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DLM kicks in overnight, generally between 3am-5am, that's when it makes changes. You might not notice the drop on the graphing as the drop is very quick. If the DLM monitoring notices a whole bunch or errors at 5pm for 15 minutes, it'll take that into consideration when it decides what action to take on your line.
A really important point, DLM doesn't just detect how long you've been online for, it looks at the errors on the line and takes action to stop them from getting higher and higher and eventually causing you to drop connection or the connection becoming unusable.
Re: FTTC dlm guide and barrier
27-05-2014 12:42 PM
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Say someone is watching the World Cup final via Multicast and there are a large number of errors causing disconnects during the game, it seems strange that DLM will have to wait until the next morning to provide line stability.
Re: FTTC dlm guide and barrier
27-05-2014 12:43 PM
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There are ongoing discussions at the moment with regards to a DLM re-design for FTTC but we've not got anything set in concrete on that yet.
Re: FTTC dlm guide and barrier
27-05-2014 1:42 PM
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Re: FTTC dlm guide and barrier
27-05-2014 2:00 PM
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Re: FTTC dlm guide and barrier
27-05-2014 8:11 PM
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Add a overide system, enforcing full automation on everyone isnt right and ultimately will add support load anyway as you know people demand fast path back etc. At the very least make it so isp's (and in turn even end users maybe) can initiate a DLM reset.
The current system where DLM reacts hours after the event is silly, e.g. if a line has a burst of noise at 7pm, whilst the user is watching netflix its a one off burst of noise that lasts an hour, the netflix experience is ruined due to excessive errors on the line, but DLM doesnt react until 5am the next day when its too late, and then the line is interleaved/throttled for 8/15/31 days because of a one off burst of noise. Thats bad.
I have been using my service at 5am, everything is fine and DLM knocks me offline to make a change. Not good. I dont think DLM should ever take a line offline to make a change, it should only make a change if the line is offline anyway or actually during periods of instability, not hours later.
So in short share info, give user's (or at least isps) some control, and make DLM more passive including an overide system.
Re: FTTC dlm guide and barrier
28-05-2014 9:08 AM
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Stability needs to be instantaneous (for those that want and need it), rather than delayed. I would think anyone using IPTV/Multicast would want prioritised and stable TV service.
Re: FTTC dlm guide and barrier
28-05-2014 9:13 AM
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@AndyH - Yes, if it worked on the fly, it would be great, something that I feel may be looked at. I agree with what you say and I'll pass those comments on when I next meet BT Openreach tomorrow.
Re: FTTC dlm guide and barrier
28-05-2014 6:27 PM
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Which set error rates is the dlm using for its "intelligent decision" making..... ? {The ECI msan's report certain error rates differently to Huawei's}
Thx
Re: FTTC dlm guide and barrier
28-05-2014 9:03 PM
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Quote from: chrcoluk Add a overide system, enforcing full automation on everyone isnt right and ultimately will add support load anyway as you know people demand fast path back etc. At the very least make it so isp's (and in turn even end users maybe) can initiate a DLM reset.
I suspect BTOR will be very reluctant to give anyone control of Interleaving.
If/when vectoring comes into play then the DLM/vectoring stuff needs to be in complete control of the network.
Any outside ability to unilaterally affect one line by switching its parameters - which may have the effect of messing up everyone else's line in the vectored cable bundle is going to be highly undesirable.
Mind you the same applies to those who remove the BTOR modem and put another 3rd part modem in its place. If this modem has a less than effective vectoring compliant routines running in it then it has the ability to again mess up the vectoring of other lines in the cable bundle. The ultimate solution is of course for the DLM simply to disconnect the disturbing modem!
We are indeed moving towards a fully automatic system with no overrides.
The nearest analogy I can find are car ignition advance/retard system.
Originally a lever on the steering wheel controlled them and the driver set it for the engine load conditions.
Then various springs and manually adjustable offsets in the distributor made a semi-bad job of automating it.
Now it is done totally invisibly by the engine ECU and there is no way of altering it.
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