It may not be significant (at the moment, i'm expecting a drop when the 2nd line on this dropwire gets activated with FTTC!) but it is very perculiar indeed and goes against all expectations

Misconception or not the fact that modem/router stats refer to it as SNR means it's easier to refer to it as SNR for whatever purposes they have in quoting the figures.

Additionally a drop in the SNR value on the linestats along with a lowering of max attainable speed indicates it has indeed worsened

the previous drop it turns out was aluminium

There has never been aluminium dropwire.

Line attenuation actually went down, which generally indicates improvement as well. So it's not all bad

Just wondering, are you very close to your cabinet, because the power levels can and do get attenuated if its not required to get a good signal and not to create crosstalk to other lines.

Because -9.2 dB is rather low, so I would home the noise level is lower than that.

A friend of mine who has VM told me that he had to have attenuators installed to his connection to reduce his power levels due to his line was causing issues to other customers on his cabinet.

So maybe that's what's happening here.

Paul

Yes, about 100m away (I think 0.4mm copper, so equivalent to 150m of 0.5mm copper) - and it's the "upstream power backoff" principle I mentioned earlier that performs this "attenuation". Modems on short lines agree on a lower power level to transmit at.

My QLN shows that U1 is pretty quiet, but has no data for U2. The downstream bands are noisy.

My bitloading puts 9 bits in U0, 6-7 bits in U2, but only 3 bits in U1 - showing it is really holding back in U1. I don't know if it truly is down in the nano-watts, but it is low!

the new drop is a 4 pair solid copper wire. (apparently BT don't do 2 pair drops anymore, only single pair and if somebody needs more they use a 4 pair...at least according to my engineer).

The engineer is right . Was ment to save on copper but most guys just use the 4pr all the time now ! Well you can only carry so much stuff.

Was maent to save on copper but most guys just use the 4pr all the time now ! Well you can only carry so much stuff.

I have been told you can get a 10 pointer for using CAD55 when only Drop11 was required.

And you would be right .

Kinda daft really, all that time spent developing new racking in vans, and yet forgot the simplest part, a decent bit of space to store all the other random gear we have to carry ...... And thus making engineers just carry CAD55, risk an audit failure, because their can has not enough room.

BS is what it is.