I have two BT lines here installed. One is connected to BT Total Broadband (Option 3 Unlimited) and the second line is connected with IDNET. The IDNET line is much faster for downloads than the BT Total Broadband line. 15MB vs. less than 9MB with BT. The only big difference in the line stats between the two lines is the reported Noise Margin Downstream.
Here are the stats for both lines
BT Total Broadband Line
Downstream: 8876 Kbps
Upstream 1191 Kbps
Line attenuation (Down/Up) 31.0 dB / 15.7 dB
Noise margin (Down/Up) 12.2 dB / 6.2 dB
Latency type: Interleaved
Downstream: 15226 Kbps
Upstream 1295 Kbps
Line attenuation (Down/Up) 33.0 dB / 17.3 dB
Noise margin (Down/Up) 6.2 dB / 6.9 dB
Latency type: Unknown (it's not reported by the router)
1. I've recently disconnected Sky HD Box (Saturday) and DECT phones (today) from the BT line to see if that might help. I'm not sure if the numbers would improve immediately or if I would have to wait a longer time? That's the only difference between the two lines in terms of connectivity.
2. Both routers (Home Hub 2.0 and a Netgear DGN3300) connect to the same 2 port BT wall socket. I've tested the same Netgear router on the BT Total Broadband line over a period of months but it doesn't make any difference to the speeds.
3. I've tried switching the filters and the cable that connects from BT wall socket between the routers to see if that might be causing a problem, but it makes no difference.
As far as I know, the BT line should be performing better than IDNET because the attenuation numbers are lower? I'm guessing the noise margin must be what's dragging the connection speeds back so dramatically. It's the only thing i can see that could be difference. But I'm not sure what I can do to improve it.
Anyone have an idea what might be going wrong here?
Thanks in advance!