Hearing you loud and clear.

Cancelled BT Engineer visit for 10th Feb. Noise on the phone has become somewhat insignificant when listening. A test two days ago with a corded handset using the BT Test Socket did not reveal any noise.

My link has been up for 1 day and 4 hours which compared to a week ago is amazing.
Consistently seeing upload of 800+ Kbps but the download remains at around 5.25 Mbps.
Waiting to see if the link stays up longer and my line profile speed gets automatically adjusted.

I need to understand the Attenuation level and CRC & HEC errors in my Router's stats.
Should I start a new thread?

No. You've already posted line stats here.

I am trying to understand why my Down link Attenuation is much higher than that for the Up link.

Also, I am getting a large number of CRC & HEC errors. Both are much larger for the Down link.
I have read that a large number of CRC & HEC errors are associated with noise.

Can you please advise.

Down more than high (and usually double the figure)

Because attenuation is higher the higher the frequency. Upstream on ADSL2+ runs in the block under 100KHz and download runs in the next block all the way to 2200 KHz. (Fixed typo that showed wrong units)

This explains the big difference.

The downstream being larger is more prone to noise, and also has to compete with all the AM radio stations.

Edited by MrSaffron (Thu 06-Feb-14 11:30:59)

Thank you for your explanation, it enhances my understanding. Was not aware of the different frequencies involved which explains a lot.

In reply to a post by MrSaffron:

download runs in the next block all the way to 2200 MHz.

2200 kHz?

In reply to a post by kasg:

In reply to a post by MrSaffron:

download runs in the next block all the way to 2200 MHz.

2200 kHz?

The typo is due refers to the frequency with which his fingers hit the keyboard.

Did the noise appear after heavy rain? With the amount of rain we've all had, you should be able to correlate those two occurrences.

I have tried to correlate such as the wind and the rain to the noise but it is nigh on impossible as we have had so much. Other than the driving the rain, the high winds are not relevant as the telephone cable does not go to a telegraph pole. Except for no more than 12" (3" inside and 12" outside) the cable is underground. It must go to a cabinet which is above ground.

After the link being up for more than 37 hours, I lost my Internet connection and on checking my Router, the link had gone down and than re-established. The Down S/N was around 6db but the Up S/N was going up and down anywhere between 3 and 9db. It settled at the higher end. Subsequently, the 800+ Kbps I had enjoyed for a day and a half, went to 570 Kbps. Several hours after the event, I decided to do a Router restart from the GUI. The Up S/N was then around 6db (just checked again and it is 5.7db). The Up speed is now back to 800+ Kbps.

During the day (earlier), I could not discern any noise when snooping' the line or during telephone conversations. In the past few hours I have heard some very faint noise.