upstream speed dropping intermittently

I have a Thomson 585v7 on O2 running the latest Be* v8 firmware.

I am around 5km away and sync at ~ 3700 down, 920 up. This can be as high as 4500 down in quiet periods or as low as 3300 at bad times, although upstream is rarely lower than ~ 860.

Once synced the connection is usually ok for a number of days, it will usually glitch at least once a week, but is otherwise ok

Recently (about twice before going v7->v8, but severly in the last 24 hours) I've experienced an issue where my adsl connection has dropped only to reconnect, eventually (sometiems taking a number of attempts) syncing with a regular downstream speed, but with upload in the region 150-450

When I've checked the protocol is still ADSL2+. Usually a forced resync will get it back to normal.

Last night was bad -- the connection stayed low. I tried a "bt line test" in case there was any blatant analogue problem. No problem found. I also listed to the line and on at least 2 occasions am sure I heard some crackle, and clicks (like a rotary dial) but a little later there was nothing.

I have no extension wiring connected, just a master socket splitter, but as my phone is a dect basestation normally connected to a voip gateway (I can still make a pstn call via a dialling plan) I need to hard wire a basic old analogue phone direct to test socket to verify before chasing up a further fault.

What kind of problem would cause a disconnect and really slow upstream, but leave downstream seemingly unaffected?

Thanks
Nigel.
Before reporting I need

The upstream and downstream frequencies are different. The upstream frequencies are just above the audible frequencies. The simplest explanation is that there is a new source of interference in the upstream.

http://en.wikipedia.org/wiki/ITU_G.992.3/4

Hi

I would try a different/new filter as sometimes these go bad. As filters play with the lower frequencies a bad filter can cause upstream problems.

Also try a quiet line test, you can use your DECT phone connected to the socket, no need to use an analogue phone if you haven't one. First listen to the DECT phone without it connected to the phone socket, this way you will know what noise and hiss the DECT phone has. If it hisses and buzzes quite loudly it might mask a line problem though, but typical noise due to a bad joint is normally unmistakable. Plug it in to the phone socket and listen for noise. If it crackles and pops you know you have a line fault and should report it as a voice fault, don't mention broadband.

Don't forget the problem might be intermittent so be prepared to listen during a spell of bad connections.

Regards

Phil

Edited by deleted (Mon 14-Sep-09 17:35:31)