internet unstable

faseman7 · 12 Sep 2011 at 11:14

Hi, i have a Netgear DGN2000 router with BT isp and ADSL. I normally have 7mb download and 0.34mb upload. It is unstable most of the time. Can someone please check my stats to see if my noise margin is what it should be as i have heard that snr can cause this problem. Thanks Lee ( not einstein with computers )

ADSL Link Downstream Upstream
Connection Speed 8128 kbps 448 kbps
Line Attenuation 6.0 db 4.0 db
Noise Margin 12.8 db 27.0 db

Port....Status..............TxPkts........RxPkts....Collisions.....Tx B/s....Rx B/s
WAN....PPPoA...............80022.......105294.......0............3571......23561
LAN.....10M/100M..........5780............0............0.............337..........0
WLAN...11M/54M/270M..114153......88488.........0............24270.....4334

schnoodles · 12 Sep 2011 at 14:30

Attenuation and SNR are excellent. You shouldn't have any problems with those stats.

What do you mean by "unstable"? Is the router actually losing sync? Silly question, but do you have filters on all your phone points?

faseman7 · 12 Sep 2011 at 18:06

one day 7mb and then just drops to 2-3mb and stays there for hours, netgear have checked router and is ok, bt engineers have been out and everything checked ok. I have filter on the phone point yes.

Tealc · 12 Sep 2011 at 19:44

Run Routerstats and monitor your connection speed and SNT for fluctuations.

You should be getting a rock solid 8mbit with that sort of attenuation and 20mbit or over with LLU/ADSL2+.

Any noise on the voice line when the speed or SNR drops? That was my indication of a dodgy line.

schnoodles · 13 Sep 2011 at 11:18

faseman7 said:
one day 7mb and then just drops to 2-3mb and stays there for hours, netgear have checked router and is ok, bt engineers have been out and everything checked ok. I have filter on the phone point yes.

Do you have more than one phone point though? If you have phones plugged into any secondary phone points, they need to be filtered too.

Having said that, unfiltered extensions could cause sync to drop, but not a drop in sync speed.

Is the attenuation and SNR the same when the sync speed is poor?

faseman7 · 13 Sep 2011 at 12:04

i have only one phone plugged in with a filter and no extention. The snr and attenuation stay the same.

Tealc · 13 Sep 2011 at 15:21

If the SNR and attenuation are constant (and therefore connection speed remains at 8mbit) then the problem is your ISP throttling your connection. If the connection speed and SNR (and I don't mean a speedtest) is dropping then you have line instability.

You may be 'connecting' at 8mbit but BT can control the amount of data you can transfer so that you don't take too much bandwidth that could be used by other BT customers. That's my guess anyway.

Might be worth checking to see if you can go LLU with your broadband to get some unthrottled 20mbit goodness.

PiKe · 13 Sep 2011 at 15:27

I will wager BT throttling you, otherwise 3mbit sync is grounds for a low threshold breach fault.