SNR (Signal to Noise Ratio) fluctuates throughout the day depending upon local conditions.. the higher your SNR Margin, then the stronger the signal is. With MaxDSL, when you sync up, the DLM at the exchange will give you the highest speed it can depending upon what your Target SNR is set at.
Whilst Target SNR and SNR Margin are related - they are not the same thing.
Looking at your stats after a reboot, the DLM has your Target SNR set at 9dB. Therefore upon syncing the DLM will give you the best speed it can whilst giving you an SNRMargin of 9dB as a "buffer zone".
Obviously after sync up - your SNR Margin will continue to fluctuate.
Theres more info about SNR, SNR Margin and the target SNR -
An explanation of SNR and SNR Margin.
>> I have tried endless resyncs to try and rectify the Upstream & downstream Sync
As mentioned above your (downstream) target SNR is set at 9dB. This is fairly normal so not too much you can do about that. However the 256 kbps is odd and it looks like Tiscali for some reason may have limited this on one of their profiles. Thats not a typical BTw upstream sync and looks like Tiscali for some strange reason have limited it.
Hmmm - stop!
- Ive just checked
Tiscali LLU profiles >> Sync Down: 4960kbps
Just checking - Could that figure by any chance actually be 4096?
I think we may have just found (well at least 1 of 3 possibilities) which profile Tiscali have put you on. WTH tiscali have limited your upstream Ive no idea and put you on that profile, since your upstream looks fine.
I could be wrong - but it looks like to me that tiscali are perhaps buggering about changing profiles seeing if that will correct your fault rather than actually passing on to BT.
Whats the stability of your line like atm?
>> I have asked them about whether it is switched on or not,.... /snip/... is there an alternative way
They should easily be able to tell you.. but most routers will tell you somewhere. Which router are you using?