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[#1]

Maybe it's wishful thinking but the graphs look a lot smoother to mr!, Jack

[#2]

It certainly looks a lot flatter surprisingly, whether that's related to the ridge of high pressure over europe at the moment, or how much of it is because of the reduced bits on tone 69 I'm not sure, but I expect that is why there was no gain on sync speed (plus a few other bits less hear and there).
I'd forgotten about the radio station and taxi office you mentioned a lot earlier in the thread, the latter probably related to some of those spurious spikes that appear periodically.
I don't suppose it'll stay flat very long, I expect it's a bit more lively now it's dark.

[#3]

Your right a lot spikier now.
Both the radio station and taxi office were checked out by OFCOM and were clean so I don't think they are causing any problem, there's also the fact that before when I wasn't getting problems they were there then, I think the thing to do is leave it as it is tomorrow and see what happens, Jack.

[#4]

I wouldn't suggest doing anything tonight in any event. Also, just because OFCOM checked something a year ago, doesn't mean it's still OK - equipment can go out of spec or faulty - not that I'm suggesting or implying that there is anything wrong at either installation. I'll try and clarify a bit more for the benefit of any readers.
Let's deal with continuously transmitting radio stations first. If it's MW (or LW), it will certainly contribute to general noise around ADSL frequencies, this in itself won't necessarily cause a problem (but if there was any overmodulation there is likely to be a few spikes all over the place). If it's FM it may contribute slight background noise, but this is unlikely.
Now consider -Taxi base stations, Mobile stations, CB Radios, Ham radio, Personal Radios/WalkieTalkies, Police, Fire, Ambulance, in fact any moderate power intermittently operating transmitters.
Any electronic equipment that is in close proximity to any such transmitters is likely to see "some" effect. The question would be "does that effect interfere with the normal operation?". AM or SSB transmitters are more likley to cause problems than FM ones. However, at 'key-up' all will cause a surge of RF. With well designed equipment not suffering any faults - effects are likely to be small, except under extreme circumstances or very high field strengths.
For any equipment, including a telephone line and any equipment connected to it, any poor, faulty or corroded joint, or joint of different metals or sometimes just circuit layout, can result in a voltage appearing at the joint or in the circuit, if RF is present. This voltage can vary with the RF signal, and with some equipment it may get amplified. This may interfere with normal operation. Also, If for example a joint varies, the interference may vary.
If background noise levels increase, either from propagation effects or just more things generating the noise, ie more Broadband connections, discharge lights or more of anything capable of emitting RF, then other signals or small spikes which by themselves may not cause a problem, when added to the increased background can result in interference to normal operation.
(So for example, a taxi radio which may be operating correctly and legally can start causing a problem because general background noise is higher). Solving interference can be tricky. In the case of Ham Radio for example, there is an onus on the operator to assist in supressing the interference to affected equipment. In the case of TV there is an onus on OFCOM to assist in supression of interference, but guess what, in the case of ADSL there is no onus on OFCOM to the best of our knowledge!)
Well I've tried to explain all that in a manner that non-technical people may understand, I know the english isn't perfect, but I hope that helps some of the readers.
Edit: I notice noise levels are a bit more extreme tonight my way. also yours looking at the DMT plot.

[#5]

Thanks for the information, I spoke with local computer repair shop which is very close to the taxi office and they said they were unaware of any local causes of interference and didn't suffer themselves. No nearby taxi ranks, in fact taxi's are a rare breed here as it's a short cut from Bournemouth to Boscombe so not much used by taxi's.
Early todays graphs looked promising until around 08.37 but afterwards settled down again, what are your thoughts about another small reduction later today?, regards, Jack.

[#6]

Well, encouraging news about the taxis etc. although unless they are monitoring continually they may not be aware of any spikes or other variations, they may not even be that clued up on the intricacies of ADSL. Don't suppose you discovered what sort of sync speed they had, perhaps they don't know themselves"!!!!
That SNRM at 0836/0839 and a similar single spike at 0849 not nice, but the consequences don't seemed to have been great. I don't suppose you had a listen to your phone line whilst that 0836/0839 lot was going on?
I suppose if that SNRM is still running better than 8.2/8.3 and steady, it may be worth moving the slider to 70% and having another go. If it going below 8.0 at all don't bother, wait a while.

[#7]

Just set it to 70% and sync. speed now at 6688 and SNRM at 7.8 so not much difference.
Wasn't on the phone at that time but regular checks on 17070 are showing a very clean line, I check around 6 times a day, will let it run now for 2 hours and post another DMT screenshot, Jack.

[#8]

The trick would be to pick up the phone as soon as you spot any significant variations whilst it is going on.
A screenshot now would be good, to look at bit allocation as much as anything. That sync speed doesn't seem to want to go where we would like.

[#9]

The trouble is Chris I can't sit in front of the computer all day but if I see it happening I will try as the phone is always next to me, I have watched the screen as I make calls but it stays steady.
Here is a screenshot which to me looks fine,  so tomorrow I would like to go to 50% and see what happens, what do you think?, Jack.

[#10]

Is it worth bothering with?
Won't the BRAS profiling cut your transmission rates, so that unless you can gain a really substantial amount you won't notice any difference.

[#11]

Hi Jack,
No, I wouldn't expect you to be looking at it all day, just be alert to checking if you do see anything odd happening.
Interesting that the reduced no of bits has moved to tone 86 now!! Something very strange going on, but it would also appear that there were no CRC or ES errors in that 2hr slot!
Because this isn't playing ball correctly and because of what happened previously, no, I would not recommend trying 50% yet. A little more patience. Let's watch what the SNRM is doing, tomorrow morning. IF it stays nice and flat as it has done in that 1440/1640 period AND the SNRM is no worse than 7.9, preferably better than 8 I'd try kicking it again at 70%. That sync speed should have gone to 6816+ (a 6M profile) already, and it hasn't. Either you've been very very unlucky at each resync and caught a dip, or something is up the creek, and there is no hard evidence to indicate what.
@Axis
Hi Jeremy, you're right and you're wrong, as you can see from the figures I've just mentioned. That extra 1/2M on the profile is worth having, I speak from experience! (seen the film and all that).
What's the latest DMT snapshot like Jack?
Edit: To correct terminology

[#12]

It's been pretty steady all evening , I'll stick with you plan in the morning.
Here's the last screeshot I took, Jack.

[#13]

Hmm. A bit noisier, but only by about 1/2dB on average. Interesting that there's been no CRC or ES errors in the last hour again. Only 9 CRC's & 8 ES's between 1630 & 2056.

[#14]

Mornig Jack,
What's the current RS Noise Margin graph looking like?

[#15]

Hi Chris,
               Looks fine to me, not that that means much! I intended to leave it until lunch time and then go for 70/60% what do you think?, Jack.
              Just added the DMT.