A problem manifest with my line a few mnths ago and I'm wondering what the technical reasons bedhind it could be..
for many months before i'd have a script that rebooted my draytek router at midnight and at 7am, as without it i'd often find traffic would just stop flowing. everything else seemed fine in terms of sync speed, downstream snr etc.. it was like it wasnt a dsl link layer but a hgher up the tcp stack problem
around the start of feb, internet suddenly became very unreliable, with more than 50 disconnects or lost syncs per day and long periods that the router couldnt get sync. when on, syncing was at 256kb, normally 6.5mb
plusnet blamed my reboot script, saying the regular disconnects had caused their kit to see the line as unreliable and changed profile. they reset the line and told me to stop rebooting the router
i was still suffering slow speeds and eventually the took me off the restricted profile. internet was unreliable though SNR was fine at around 9
SNR gradually fell to 4 and internet became unreliable. an engineer visted and said the line was perfect, but he changed the faceplate and twiddled some screws anyway
since then i've had a merrygoround with plusnet where the snr drops to 0, i complain, they say theyll set the snr to 8 (how can you "set" the noise of a line?), it ends up at 4 and gradually drops to 0, i go on a restricted profile, snr goes up a bit, i complain of slow speeds, they unrestrict me, set the snr higher, reset the line, it craps out again..
i've had 4 different routers, 3 filters and wires and i'm plugged straight into the master socket..when snr was low but internet was functional i noticed that actually using it killed it.. i'd reboot the router, web would work fine, but watch youtube vids or start a torrent download and the whole thing would collapse in a heap minutes later. pinging google would take anything up to 3.5 seconds to respond even after other activities were stopped. at first i thought it was the router but 3 different models of draytek and a netgear all behave the same..
what complex interplay of issues is at work here? why do 4 different routers say my line has a poor snr, bt say its perfect, and the net works fine for light browsing but as soon as you hammer it, it claps out? snr now hovers around 1db no matter what PN say theyre gonna do with it.
is it relevant that i'm in an area that was supposed to be FTTC by mar 2012?