The mystery of the constantly decreasing Down Rate since start of Covid-19 period

[nelster]

Hi. Is this a common occurrence for all users ?

Is it possible that it is at the cabinet level and Openreach are "stealing" bandwidth to make room for more connections ?

The decrease seems to correlate with the increase in the noise margin ?

Thanks.

12:05:53 27 Sep. DSL Link Up: Down Rate=35000Kbps Up Rate=7680Kbps; SNR Margin Down=11.0dB
08:39:58 07 Aug. DSL Link Up: Down Rate=35000Kbps Up Rate=7645Kbps; SNR Margin Down=10.9dB
03:08:18 30 Jul. DSL Link Up: Down Rate=35000Kbps Up Rate=7691Kbps; SNR Margin Down=10.6dB
00:35:21 19 Jul. DSL Link Up: Down Rate=35000Kbps Up Rate=7645Kbps; SNR Margin Down=10.4dB
02:59:44 16 Jul. DSL Link Up: Down Rate=39999Kbps Up Rate=7991Kbps; SNR Margin Down=9.8dB
22:47:53 03 Jul. DSL Link Up: Down Rate=39999Kbps Up Rate=7768Kbps; SNR Margin Down=8.9dB
00:44:20 30 Jun. DSL Link Up: Down Rate=39999Kbps Up Rate=7803Kbps; SNR Margin Down=9.0dB
09:03:42 27 May. DSL Link Up: Down Rate=39999Kbps Up Rate=7761Kbps; SNR Margin Down=9.1dB
10:28:10 29 Apr. DSL Link Up: Down Rate=39999Kbps Up Rate=7799Kbps; SNR Margin Down=9.5dB
12:12:02 26 Apr. DSL Link Up: Down Rate=39999Kbps Up Rate=7902Kbps; SNR Margin Down=9.3dB
02:55:02 19 Apr. DSL Link Up: Down Rate=39999Kbps Up Rate=7722Kbps; SNR Margin Down=9.3dB
02:33:07 12 Apr. DSL Link Up: Down Rate=43998Kbps Up Rate=7814Kbps; SNR Margin Down=7.1dB
00:39:28 02 Apr. DSL Link Up: Down Rate=56124Kbps Up Rate=8877Kbps; SNR
07:03:55 05 Mar. DSL Link Up: Down Rate=48526Kbps Up Rate=8266Kbps; SNR Margin Down=5.3dB

[iniltous]

1.No
2.No, bandwidth and sync speed are not the same thing.
3.Not really a question, but noise margin and sync rate are linked , to provide optimum speed/stability, if your speed drifts downwards you may have a line fault and DLM is reducing speed because of it, you need to eliminate any internal issues and check for a noisy line , from the master socket test port dial 17070 and take the quiet line option, if the line isn’t quiet it could indicate a line fault , connect your router into the test port if the speed improves your internal wiring may have issues

[nelster]

Calvin from BT complaints has just stated to me that they are not interested in the clear and proved drop in down rate as there is no line fault and the speed is still above minimum guarantee.

It was also stated that the loss of bandwidth will be due to the cabinet being overloaded and them taking bandwidth off folk for more ports.

There was no reply to me informing him that I have a 2nd broadband line off the same master line with a different firm thats had no loss

Not really sure what to do now.

[imjolly]

What you were told by BT complaints was rubbish

you have a line problem causing the drops in connection resulting in higher noise margin and lower speed as DLM tries to stabilise your line 

did you do quiet line test?

have you tried using test socket with a filter to see if that stabilises your connection?

[nelster]

Thanks for the reply. I will endeavour to do those steps but the BT guy wasnt for budging and claimed ‘the engineers would refuse to accept the job as theres no obvious problem’

Probably be next midweek before time will permit me to take stuff apart and get into the master socket.

[imjolly]

What about the basic test of checking for dial tone and line noise?

[nelster]

I will get it done and appreciate the reply its just a bit awkward where it is and i do not usually plug a phone in there. I do appreciate the reply will check when i can.

[nelster]

Latest on this.

After much complaining and cancelling of complaints I got some form of escalation and the representative manually booked openreach to assist.

Engineer has been out all internal wiring checked out perfect, nothing wrong within the house.

I have been moved port within the cabinet and old port marked as faulty. Discussions with BT on various aspects of the reset took 45 minutes for the engineer he said it would normally take 10, not got a precise background on that. New router also being sent.

So far line profile still sitting sub 40000, noise back down at 6db but I will leave it to auto adjust back up hopefully. Response times on all devices / smart tv back to normal.

16:26:08, 31 Dec.	PPP LCP Send Configuration Request
16:25:43, 31 Dec.	DSL Link Up: Down Rate=39698Kbps, Up Rate=7803Kbps; SNR Margin Down=5.9dB, Up=6.0dB