Are you confusing the natural variation in tx/rx margins with the DLM system?

noise margins will go up and down according to the noise environment, which is NOT constant. If it were the DLM you would be having resyncs

Don't think so.

For example:
Re-sync this morning (remember I'm on my "10 training period" again). rx SNRM then jumps from 6dB (fair enough... as you say... it fluctuates around 0.5 dB up/down during the day) to 12dB. rx sync stays the same. I can see all this via the graphs that RouterStats produces. Sad man that I am, I've been running this application (IE. RouterStats) pretty much 24/7 during this almost month long fiasco!

If this was a "new training period" then should not my line have sync'd at around the max it should be capable of supporting at the start of this period? On 37dB rx attn and what had up to now been a pretty solid 6dB sync, then I would have thought that this should have been around 11Mbps!? This is in fact what happened on my first "10 day training period". All my problems have happened subsequently.
NB. Line looks fine to me from my router stats, ISP (IE. Newnet) have checked the line and also said "it looks fine to us Mike". So all told, I'm somewhat confounded by what's gone one and the at times "some what shabby" info that my ISP have come out with.

Now got my MAC and am in the process of moving to Xilo/Uno.

I appreciate the feedback though.

PS. Here's an example http://i198.photobucket.com/albums/aa200/mikedowen/s...
Corresponding drop to zero on line sync. The router event log also shows a re-sync at this time.

Edited by MrBeeline (Fri 24-Feb-12 16:49:42)

If the sync stayed the same, then that was a noise glitch and the modem has resynced with the 12dB target margin.

I am not convinced that the DLM is tweaking your target noise margiin from 6dB to 12dB and the other way around as you suggest. Improvements usually take 2 weeks to happen on the DLM to target margin, irrespective of the 10 day period.

More likely an oddity with the modem and BT kit, or genuine changes in noise, with figures all confused by a banded profile being applied, and while the graphs are useful and descriptions, more actual data would need to be seen. In a perfect world for every resync, the sync, margins and attenuation after every sync, and periodically grabbed to see the trend over time.

Your router stats graph looks just the same as mine (except SN margin returned to the same level) during a burst of noise at the exchange when I received incoming phone calls which also dropped the dsl connection.

This happened when I was on a adsl1 service with Plusnet last year. An Openreach SFI engineer couldn't fix it, Plusnet didn't seem to want to investigate the fault any further so I left Plusnet and went to partial LLU adsl2+ and the exchange noise problem has gone away

MrSaffron

I hear what you say. But all I can go by is what I see and what I get told. Newnet confirmed to me (if you can believe them!?) that they could see that my Target SNRM (their term) had steadily increased from 6dB, to 9, to 12, to 15 and that I had then been bumped onto an G.992.1 profile. And were totally confused / could not understand what was going on. First 10 days fine, then two weeks worth of ****. Newnet "claim" to have run numerous tests on my line and could not see any problem. So I suppose that leaves BT's kit at the exchange and my router.

The proof in the pudding I suppose is what happens when my Xilo/Uno connection goes live.

Though I think that I shall purchase yet another modem/router prior to this and try it while I'm still on my Newnet connection. That should give me some feel (maybe) for what's going on.

Broadband, great when it works but a world of hurt when it doesn't (first major problem since BB enabled back in 2006).

Edited by MrBeeline (Fri 24-Feb-12 20:56:41)

In reply to a post by 4M2:

and went to partial LLU adsl2+ and the exchange noise problem has gone away

I'm keeping my fingers crossed that this will be my experience as well.

Just seems that everything was hunky-dory when you were on adsl1 and now after the change to adsl2+ things have got messy which does suggest a line/equipment issue somewhere exchange side of your nte master socket.

Did your ISP offer to send an Openreach SFI engineer out to check the copper pair run etc. from your premises to the exchange? I reckon you did all the checks that are humanly possible your side of the nte5 and an engineer should have been booked...deeds rather than words might have been a lot more useful.

4M2

"Just seems that everything was hunky-dory when you were on adsl1 and now after the change to adsl2+ things have got messy which does suggest a line/equipment issue somewhere exchange side of your nte master socket"

Indeed. But worse than that... everything was fine on ADSL2+ for the first 10 days.

"Did your ISP offer to send an Openreach SFI engineer out to check the copper pair run etc. from your premises to the exchange? "

To be honest, yes they did. But that would have been after this "10 day fictitious training period".

Though even after that. I would have been tempted to purchase another router and try that first.
Engineer visits (as I commented earlier) are the last resort... as they can end up costing you a fortune and causing even more hassle/stress.

Hopefully a move to Xilo/Uno, combined with a new router (probably a TP-link, or a Netgear) should see my problems over (hopefully).

Think I'll just shut up now (thank God say some) and stick with what I have now until the new connection arrives.

The daft thing is, I suspect there are loads out there that would kill for the sync that I'm currently getting!

PS. Just got a go live date from Xilo/Uno of 5/3/2012/ So little more than a week to go.

Edited by MrBeeline (Fri 24-Feb-12 23:12:42)

I know what you mean about being somewhat fearful regarding the potental cost of an engineer's visit However if the fault is diagnosed as being exchange side of the nte there is at least some satisfaction in knowing that one has been thorough in checking everything user side of the nte. But then comes the secondary problem, as you suggested, of getting Openreach and the ISP to fix it

Anyway best of luck...

Out of interest... Could anyone explain (in layman's terms) what the RCO is?

DMT shows: RCO 40% (11350kbps)
My current sync is: 4,540kbps which appears to be 40% of the above figure.

I have GOOGLE'd and am still not quite sure what I'm looking at.

Edited by MrBeeline (Sun 26-Feb-12 12:19:12)