There is a lot of potential for noise from all of that. How far from te master sockets are the two modems?

I always recommend that the modem is located as close as possible to where the line enters the house to minimise any problems from noise or wiring issues. I know you have a combined modem/router but that can be overcome.


A quick look at your stats does not show anything significant - the downstream SNR margins are different but that may be because the DLM has intervened.

Edited by MHC (Tue 18-Nov-14 17:00:33)

In reply to a post by RobertoS:

Interestingly the new line is now on ADSL2 (G.992.3). Both were previously on ADSL (G.992.1).

Sorry, my copy and pasting error, I've corrected it now!!!

In reply to a post by MHC:

I always recommend that the modem is located as close as possible to where the line enters the house to minimise any problems from noise or wiring issues. I know you have a combined modem/router but that can be overcome.

This is potentially an issue, though I have plugged the router/modem directly into the BT test socket and it connected at the same speed. But maybe I would need to leave it for a few days to allow the DLM to adjust? Would any useful information be gained by plugging it into the test socket and checking the stats?

The old line's BT box is in my daughter's bedroom and our small hard-wired system does not include that room (because it used to be a workshop/store room) so we may have problems if we need to move the router/modem. And it also doesn't explain why it's OK and usable for long stretches (though it's always a little slower than the new line).

Thanks,
Jos

In reply to a post by RobertoS:

Interestingly the new line is now on ADSL2 (G.992.3). Both were previously on ADSL (G.992.1).

Given that the new line is on ADSL2 (G.992.3) and the old line is on ADSL (G.992.1), could this be the cause of the speed difference?

Thanks,
Jos

In terms of leads

This lead on Amazon would fit the bill, the twisted pair is the key bit. No need for fancy gold or oxygen free stuff.

In reply to a post by Jos390:

Given that the new line is on ADSL2 (G.992.3) and the old line is on ADSL (G.992.1), could this be the cause of the speed difference?

That and the old line is 3dB longer in attenuation.

They are both underperforming by about 1 Meg.

Is it possible that old line is on a legacy 'Up to 8 Meg' product?

In reply to a post by XRaySpeX:

Is it possible that old line is on a legacy 'Up to 8 Meg' product?

Going by the upstreams it shouldn't be as the upstream should be fixed to 448 on legacy?

Another thought. Are they exactly the same make and model of router? If the new line has a different router then that may affect the performance of the connection.

I still think the fact the old line seems to have a 3dB higher target SNR will be affecting the speed by a reasonable chunk.

Might also be worth posting another set of stats now that they have been on for a while just to see that the error numbers are not wildly different for the 2 lines.

In reply to a post by XRaySpeX:

That and the old line is 3dB longer in attenuation.

I would say the lines are not much different in length - look at the UPstream attenuations 31.1 to 31.5 This is a better comparison of line length - assuming same wire gauge and type. The loss of tones due to distance and attenuation only affects downstream. The difference in downstream could well be due to measurement techniques used and across the tones in use or available.

In reply to a post by ian72:

Going by the upstreams it shouldn't be as the upstream should be fixed to 448 on legacy?

You are thinking BT 20CN ADSL Max. This is LLU. LLU ops used to offer 8 Meg capped products with the upstream uncapped. AOL LLU did so until recently and years ago I had such from Orange LLU. Tho' admittedly they were usually run on ADSL2+. It was just a thought to explain the diff ADSL Modes.