Reduce SNR from 6db to 3db

[#1]

Hello, 

I've had an EE ADSL line running at 3db for the last year or so with no issues at all.

I've had a second line activated today (on Plusnet) which is running at 6db so it's a bit slower than the EE line, I was just wondering if this could be lowered at all to match the existing EE line?

Many thanks,

Ben

[#2]

DLM should do it automatically once the initial line training period is over.

[#3]

Thanks for that,

I've just noticed, there seems to be a lot of errors being generated, does anyone know why this could be, also the attenuation looks to be slightly higher than the existing line. 

I've attached a screenshot (Plusnet line is WAN2)

[#4]

No two lines are identical, even to the same property as they could be routed differently. That said a 1dB difference is neither here nor there. In fact the firmware differences could be the culprit.

WAN2 rather looks as though there was noise on the line when it synch'd up. Do a quiet line test from time to time.

[#5]

Cheers for that,

Bare in mind the errors have steadily increased overnight too, attached another screenshot...

Ben

[#6]

I've also bought a cheap wired phone to do a quiet line test with, both lines are absolutely silent.

[#7]

I would suspect that either the RX CRC error counter is broken if it always says zero after a few days uptime, or perhaps one line has FEC+interleaving which is correcting any corrupted data, and the other line doesn't.

DSL technology is designed to work at a certain error rate, so a certain level of errors is normal and to be expected.