My maximum speed

joeyjojo · 21 Sep 2006 at 22:46

Yes, another max speed thread...sorry

Stats before were margin twenty something and line attenuation 40 ish, at 1 meg.

Was connected this morning with UKFSN. They've slowed it down to 6816 kbps over the course of the day. Margin is at 2 and attenuation 39.

The signal:noise is stupidly low right? I live 2.56 km from the exchange (samknows), and the wiring in the house is a mess (I imagine). Using a dlink dsl-504T. What speeds can I expect, and what can I do to improve them?

The calc isn't working for me.

Edit: ooh its up to 3

dirtydog · 22 Sep 2006 at 08:02

The SNR margin is related to your sync speed; the higher you sync, the lower your SNR margin will be, and vice versa.

Yes 2-3 is very low and you're lucky if you can stay synced at that level.

I'd say that your sync speed is very good considering your distance from the exchange. However, it would be desirable to sync a bit lower in exchange for a higher SNR margin and greater stability.

The first thing you could try is to connect your router directly to the BT test socket, and see if your SNR margin improves.

If it doesn't improve, ask your ISP if they will get BT to raise the target SNR margin for your line.

The other solution would be to get a router which allows you to limit your sync speed at your end - I don't believe your router has that function unfortunately. But try the above first.

joeyjojo · 22 Sep 2006 at 16:56

Cheers dirtydog

When I know where the test socket is located I will have a go with that. Would installing a proper faceplate make any improvement? Also, theres an extension to upstairs which isn't doing anything, would removing that help?

Wierdly, It's now synced at 8096 kbps, snr between 3 and 5, attenuation 40. Think I'd better give them some time to sync properly. I haven't noticed it being "unstable". Speeds are slow, about 4 meg ish, but speed tests vary hugely.

Anyway, yeah I'll have a go with improving the wiring and such.

Just by-the-by, what should the mtu and mru be at in the router? According to tcpoptimizer:

"The largest possible non-fragmented packet is 1472 (1500 - 28 ICMP & IP headers).
You can set your MTU to 1500"

So both mtu and mru are at 1500 in the router. Thats right, right?

dirtydog · 23 Sep 2006 at 08:14

joeyjojo said:
Cheers dirtydog

When I know where the test socket is located I will have a go with that. Would installing a proper faceplate make any improvement? Also, theres an extension to upstairs which isn't doing anything, would removing that help?

If you get better stats with the test socket then a good faceplate could help. It won't give better results than the test socket though. Also the test socket will take your extensions out of the equation.

Here is a pic of the socket if you haven't found it yet: http://www.kitz.co.uk/adsl/troubleshooting.htm

Wierdly, It's now synced at 8096 kbps, snr between 3 and 5, attenuation 40. Think I'd better give them some time to sync properly. I haven't noticed it being "unstable". Speeds are slow, about 4 meg ish, but speed tests vary hugely.

Anyway, yeah I'll have a go with improving the wiring and such.

Just by-the-by, what should the mtu and mru be at in the router? According to tcpoptimizer:

"The largest possible non-fragmented packet is 1472 (1500 - 28 ICMP & IP headers).
You can set your MTU to 1500"

So both mtu and mru are at 1500 in the router. Thats right, right?

I would leave the MTU settings on default personally, unless you have a good reason to change them