More slow sync shenanigans

Doug · 2 Aug 2010 at 14:19

Hey guys,

For the last week or so I've not been able to sync at better than 6000k, which is unusual because for the last 5 years I've been syncing at over 8000k.

My router (a Linksys WAG200G) is connected to the master socket (which I've confirmed has only wires 2 & 5 connected) and there are no extensions from there.

This is a screenshot of the BT Speedtest from thursday showing a ~6000k sync and 5000k Profile:

This is a screenshot of the BT Speedtest from sunday showing a ~6000k sync and 3500k Profile:

I noticed I was synced at only ~4500k on saturday, which probably explains the 3500k Profile.

Next is a Speedtest from today, again showing ~6000k sync and 3500k Profile:

And my router stats from the same time:

Downstream Margin usually fluctuates between 15db and 13db.
Back when I was syncing at ~8000k the margin was around 3-6db.

There have been no changes on my end, been using this router for at least 3 years.

Anything you guys can think of will be appreciated.

benftl · 2 Aug 2010 at 15:21

Downstream transmit power is pretty low by the looks of it. In your situation I'd try logging the SNR values over a period of 24 hours, if you have a spare modem try that also.

Doug · 8 Aug 2010 at 20:57

I don't have any way to automatically log the SNR Margin, but I've not noticed it drop below 13db. (If anyone knows of an OS X app to do that...)

Would I be far off base assuming that they've (BTW or my ISP?) set my SNR target up from the usual 6db? Don't they usually only do that if a connection is really unstable?

Well, on the off chance that my microfilter is being daft, I've ordered a filtered faceplate for my BT socket.

And, on the off chance that my (correction) 2 year old WAG200G is the one playing up, I've just bought a DG834GT for a tenner.

Hopefully they'll both have arrived before my day off on friday, so I'll be able to have a play about and try to get to the bottom of this

Oh, and second hand info from tech support: "but their line is showing a LTB issue." Can anyone put that into English for me?

Doug · 13 Aug 2010 at 17:36

Well, the filtered faceplate hasn't even been posted yet, but the DG834GT arrived yesterday.

After flashing it with DGTeam's latest firmware, and setting the SNR target down as low as it will go, I'm connected at ~7000k with a 9db margin.

I think that pretty much shows that they've adjusted my target SNR (to 15db ffs!), but it doesn't answer the question of why?

Rainmaker · 13 Aug 2010 at 17:40

With a downstream attenuation of 7dB you'd see pretty much the full 24Mbps on an ADSL2+ service, so you should easily be syncing at the full 8 megs all other things being well. A line fault perhaps? Then again BT/ipstream aren't exactly awesome - have you no LLU providers at your exchange? Who is your current ISP?