BT Problems

cheechm · 26 Jan 2010 at 21:35

Code:

ADSL line status
Connection information
Line state    Connected
Connection time    1 day, 1:03:43
Downstream    2,976 Kbps
Upstream    448 Kbps
ADSL settings
VPI/VCI    0/38
Type    PPPoA
Modulation    ITU-T G.992.1
Latency type    Interleaved
Noise margin (Down/Up)    12.9 dB / 17.0 dB
Line attenuation (Down/Up)    37.0 dB / 20.0 dB
Output power (Down/Up)    19.8 dBm / 12.1 dBm

Why?!?!?!

I should be receiving upto "20meg" according to BT. I live around 1.5 miles from the exchange, definitely not more than 2miles, and I used to be syncing at around 7000kbps. Why has it changed?! BT really annoy me most of the time.

Thanks for the help.

rz30 · 26 Jan 2010 at 21:45

Have you checked the BT status page?

http://btbusiness.custhelp.com/app/service_status

cheechm · 26 Jan 2010 at 22:04

If it was a problem, surely they would have fixed it after 2 weeks? And what is the "London Area"

Thanks anyways.

rippling · 26 Jan 2010 at 22:26

call them and get then to turn off interleaving on your line to , helps ping a lot!

Scottland · 27 Jan 2010 at 09:17

It looks like you'r profile is now set to a 12dB one, which explains the loss in sync speed.

cheechm · 27 Jan 2010 at 15:34

Scottland said:
It looks like you'r profile is now set to a 12dB one, which explains the loss in sync speed.

Excuse my ignorance, but could you explain what exactly that means? Like in terms of higher is better or something!?

TinkerBell · 27 Jan 2010 at 16:45

Have you actually been told that you will be receiving upto 20MB?

cheechm · 27 Jan 2010 at 17:26

TinkerBell said:
Have you actually been told that you will be receiving upto 20MB?

Yes. I got an email saying: "you should now be experienceing new upto 20meg BT Total Broadband". That is for BOTH of my connections.

Scottland · 27 Jan 2010 at 20:51

cheechm said:
Excuse my ignorance, but could you explain what exactly that means? Like in terms of higher is better or something!?

Think of the SNR as a buffer to increase stability, the higher the SNR target (in your case 12) the higher the stability of the line - in theory. The increase in the SNR causes a loss in speed however, which equates to *about* 500k for every dB IIRC.

That's a rough idea anyway...

The default target for a 'stable' line is 6dB, BT have a system on the DLSAM/MSAN in the exchange which will increase the target SNR if a line is unstable over a given period of time. It's not bulletproof however, and sometimes lines that are stable enough get set to a high SNR for no good reason, and vice versa.
(21CN can use apply a banded profile to keep it between say 2-4meg, but this is similar in principal).

In your case, for whatever reason, it looks as though your line is set to a 12dB target which explains the loss in speed. This is the most likely scenario IMO, the other thing might be that your router doesn't like ADSL2+ and is having a hissy fit.

Scottland · 27 Jan 2010 at 20:55

Oh, you should be able to log this as a fault with BT by the way. If your line was 7meg previously, your line should have a stable rate of ~5meg which it shouldn't fall below. BT should be able to report this to BT Wholesale, and they should look at the line and reset it back to a lower setting if the line looks ok.

In theory at least

cheechm · 27 Jan 2010 at 21:14

Will get on BT's case. Router is BtHomehub v2 (the new black ones)

Thanks