cancel
Showing results for 
Search instead for 
Did you mean: 
Gigabit
Contributor
370 Views
Message 11 of 62

Re: Woeful Broadband Performance

Go to solution

Before you contact BT, could you try connecting to the test socket if you have one?

 

original.jpg

 

0 Ratings
Distinguished Sage
Distinguished Sage
365 Views
Message 12 of 62

Re: Woeful Broadband Performance

Go to solution

The connection speed is fine, its just the DLM which has set the target SNR too low, its a very common problem.

0 Ratings
Gigabit
Contributor
360 Views
Message 13 of 62

Re: Woeful Broadband Performance

Go to solution

Yes, but the DLM sets the SNR margin to 3dB, not 1dB. So, if the margin is higher in the test socket it could indicate problems with the OP's wiring.

0 Ratings
George99
Aspiring Expert
346 Views
Message 14 of 62

Re: Woeful Broadband Performance

Go to solution

Hi Keith

 

Done that.

 

Regards

 

Mike

0 Ratings
George99
Aspiring Expert
343 Views
Message 15 of 62

Re: Woeful Broadband Performance

Go to solution

Keith

 

My earlier post was saying I've contacted the care team.

 

arobertson, I don't have a test socket. My outlet is an old double  socket.

 

Regards

 

Mike

0 Ratings
Gigabit
Contributor
336 Views
Message 16 of 62

Re: Woeful Broadband Performance

Go to solution

Does it say ADSL v 1.0 on it or does it say something else?

0 Ratings
Distinguished Sage
330 Views
Message 17 of 62

Re: Woeful Broadband Performance

Go to solution
@arobertson545 It is a low noise margin problem that requires the mods to reset to 6db nothing to do with sockets this has been an ongoing problem on many lines since the low noise margin trial started
0 Ratings
Highlighted
Gigabit
Contributor
327 Views
Message 18 of 62

Re: Woeful Broadband Performance

Go to solution

A 1dB noise margin trial? Yeah, right.

0 Ratings
Distinguished Sage
Distinguished Sage
321 Views
Message 19 of 62

Re: Woeful Broadband Performance

Go to solution

The trial was to reduce the target SNR from 6dB to 3db, and started last Autumn. Also the interleaving depth was increased.

 

The idea was to increase the connection speeds slightly on stable lines. It has however caused some problems on lines, when the level of radio interference causes this margin to drop too low in the evening.

 

This has resulted in an increase in uncorrected errors (CRC events), which are effectively reducing the download speeds.

 

The solution on these lines, is to set the target SNR back to 6db. This is under the control of the BT Care Team, and we can refer people to them, if we decide that its the best way forward.

 

 

0 Ratings
Gigabit
Contributor
307 Views
Message 20 of 62

Re: Woeful Broadband Performance

Go to solution

It's not a trial, it's part of 21CN DLM. It happens on ALL 21CN connections if the connection is stable enough.

 

The SNR should be 3dB in the day, not 2dB so that is why I suggested connecting to the test socket to see if the SNR was higher there.

0 Ratings