It came back online and everything worked again. However some time late I noticed the sync speed was over half of what it used to be. I have a particularly long line here, and the max sync speed I can get is around 2mbit, Usually I was seeing roughly 2mbit or 1.9mbit downstream sync speeds and 0.6mbit upstream sync. It's been like this for years and I've been happy with it. After this issue arose though the downstream had gone down to 0.7mbit.
I've since raised the issue with ISP and after all their usual checks they can't find anything wrong with my line and a BT engineer has even reset my line at the exchange (or something to that effect) with no change to my sync speeds. They say that no one can find any faults with the line remotely, so the only option I have left is to have a BT engineer come out and check the line at the property.
What I don't get here is though, despite doing all the standard checks to see if there is a problem with my equipment, I can't find any problem. Now the support guy I've been talking to says my only option is to have a BT engineer visit my property to do some checks to see if there are any faults. However apparently if no faults are found BT may very well charge me a call out fee, he then went into explaining how I can dispute this if it happens (almost as if he expects it will happen).
I've tried two different routers and they both suffer the same low sync speeds, I've tried all the usual checks, different filters, reseting the routers to factory defaults etc etc. Nothing has worked. I even tried dialling 17070 and doing the quiet line test and it seemed quiet enough.
However the odd thing about all this is, my main router is a Billion Bipac 7800N - it allows you to alter the SNR values for the line (all be it via a hidden menu). Thinking outside the box, after this issue arose (but before I contacted my ISP about it), one night I tried altering the SNR on the router and amazingly, I was able to manually increase the line speed to 1.3Mbit, though it didn't seem to want to connect to my ISP at that speed (though maybe if I'd left it long enough it would have after a few hours). That's still a lot less than what I usually got but I couldn't improve it any more than that, otherwise it just wouldn't sync at all.
The support guy however seemed to ignore this at first and then second time round seemingly assumed I meant I'd done this altering prior to the speed dropping on my line and appeared to blame it for the fault (I didn't bother to correct him). I can't help but wonder if there's something glaringly obvious being missed here. Perhaps I'm utterly wrong, but if I can get the line speed up by altering the SNR then surly that means the fault is to do with something screwing up the line SNR?
Edited by anphrax (Wed 06-Nov-13 15:54:59)