This topic

Speed drop (high SNR) after being offline and fault ticket processed that I didn't initiate

wer111d — Tue, 10 Nov 2020 12:41:06 GMT

I have noticed a marked speed drop in my FTTC connection. Download speed from roughly 65mbps down to 40mbps.

My router failed and as a result I disconnected my Openreach modem (because it served no purpose while I waited for the replacement).

I've noticed that my speeds have dropped significantly, and after checking the stats on my router I can see that the SNR is 17dB (I believe the max possible is 18dB?)

I checked for problems in my area and found a fixed problem that I did not report. The 'problem' was around the same time I was offline.

It is my suspicion that my intentional disconnection was seen as an outage, a ticket generated, and my SNR cranked up to solve the line problems... I'm now online, so I guess BT/Openreach consider it's fixed.

It's been a few weeks and the SNR has not been reduce, so I guess that unless there isn't a manual intervention it's not going to improve.

Re: Speed drop (high SNR) after being offline and fault ticket processed that I didn't initiate

imjolly — Tue, 10 Nov 2020 12:45:11 GMT

your noise margin can go higher 18db not max

are you able to post stats from the modem?

is there any line noise dial 17070 option 2 should be silent and best with corded phone

Re: Speed drop (high SNR) after being offline and fault ticket processed that I didn't initiate

wer111d — Tue, 10 Nov 2020 13:00:29 GMT

Screenshots

Re: Speed drop (high SNR) after being offline and fault ticket processed that I didn't initiate

wer111d — Tue, 10 Nov 2020 13:08:00 GMT

I tried the silent line test and it is clear

Re: Speed drop (high SNR) after being offline and fault ticket processed that I didn't initiate

wer111d — Tue, 10 Nov 2020 13:15:07 GMT

Here are all the stats:

Status: Showtime

Retrain Reason: 2

Last initialization procedure status: 0

Max: Upstream rate = 26025 Kbps, Downstream rate = 54332 Kbps

Bearer: 0, Upstream rate = 17000 Kbps, Downstream rate = 43998 Kbps

Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps

Discovery Phase (Initial) Band Plan

US: (7,32) (871,1205) (1972,2782)

DS: (33,859) (1216,1961) (2793,3959)

Medley Phase (Final) Band Plan

US: (7,32) (871,1205) (1972,2782)

DS: (33,859) (1216,1961) (2793,3959)

VDSL Port Details Upstream Downstream

Attainable Net Data Rate: 26025 kbps 54332 kbps

Actual Aggregate Tx Power: 7.1 dBm 13.4 dBm

====================================================================================

VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3

Line Attenuation(dB): 6.3 23.6 34.3 N/A N/A 11.9 28.1 43.1

Signal Attenuation(dB): 6.3 22.6 33.3 N/A N/A 15.9 27.9 43.1

SNR Margin(dB): 12.4 12.2 12.2 N/A N/A 9.2 9.1 9.2

TX Power(dBm): -1.2 -19.3 6.4 N/A N/A 10.4 7.8 6.9

Re: Speed drop (high SNR) after being offline and fault ticket processed that I didn't initiate

imjolly — Tue, 10 Nov 2020 14:14:50 GMT

the stats show and attainable of only 54mb so not going to reach 65mb as you say you had previously

I think you are in a banded profile due to the problems with your connection and the resets trying to improve it

have you tried using the test socket with a filter to see if that helps by eliminating your master socket faceplate and also any internal wiring

can you enter your phone number and post results remember delete number but leave exchange and cab

https://www.broadbandchecker.btwholesale.com/#/ADSL

Re: Speed drop (high SNR) after being offline and fault ticket processed that I didn't initiate

wer111d — Tue, 10 Nov 2020 14:47:05 GMT

Unfortunately I don't have historical data for speed tests on a computer, but I checked back in previous speed checks on my mobile app and had a speed of 59 early this year.

Does the data help?

I have tried the tests you suggest and I did actually increase the speed marginally with a new filter and high quality modem cable.

Re: Speed drop (high SNR) after being offline and fault ticket processed that I didn't initiate

imjolly — Tue, 10 Nov 2020 14:57:48 GMT

the checker results show expected range of connection speed is 77/56 so you are below that on attainable

are you able to connect to test socket with a filter and repost stats your connection speed will not improve due to banding but hoping attainable will move in expected range

Re: Speed drop (high SNR) after being offline and fault ticket processed that I didn't initiate

wer111d — Tue, 10 Nov 2020 15:14:19 GMT

It's already connected to the test socket.

Re: Speed drop (high SNR) after being offline and fault ticket processed that I didn't initiate

imjolly — Tue, 10 Nov 2020 15:20:04 GMT

if the last set of stats were from the test socket connection then although connection speed is low due to banding the attainable is below your expected range so I would phone 150 and get engineer visit

Re: Speed drop (high SNR) after being offline and fault ticket processed that I didn't initiate

wer111d — Tue, 10 Nov 2020 15:21:04 GMT

I don't know if it's significant, but this was 'fault'

Reported Fault

Problem

Broadband - UpfrontTest

Other products affected

You may also experience problems with other services such as your Landline whilst we fix your fault.

Fault fixed

Your Broadband problem has now been resolved and no further action is required. However, if you believe this not the case, please get in touch.

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