Quiet Line Test Causes Drop Out!?

speechless — Sun, 13 Sep 2020 10:37:34 GMT

Since my 2nd BT engineer visit a couple of weeks ago my broadband connection has been stable with an average download speed of 40 Mbps. Drop outs occured whenever I mad or received a phone call. The cause was noise on the line. Then for no apparent reason last Friday (11 Sept) it dropped out and returned 30 second later with a greatly reduced speed. Here are the Smart Hub 6a technical log stats:

Data rate:6.70 / 25.33 Mbps
Max data rate 6891 / 30282
Noise margin 6.2 / 6.3 dB
Line attenuation 38.2 dB
Signal attenuation 33.5 / 38.2 dB

The next morning (12 Sept) I did a Quiet Line Test. I could hear an extremely feint hiss and doing the test caused a disconnection! About 5 minutes later I checked the Hub Manager Technical log and again it appears that I had been re-synced back to my normal speed:

Data rate 9.99 / 43.38 Mbps
Max rate 11187 / 51860
Noise 6.3 / 6.2 dB
Line attenuation 39.7 dB
Signal attenuation 25.6 / 39.7 dB

Today (13 Sept) there has been a repeat of yesterday. The stats showed that the hub had re-synced at approx 3:50am and I now had a greatly reduced speed again:

Data rate 6.37 / 24.89 Mbps
Max data rate 6712 / 29861
Noise margin 6.4 / 6.4 dB
Line attenuation 38.0 dB
Signal attenuation 33.5 / 38.0 dB

I did a Quiet Line Test and again I could hear an extremely feint hiss and doing the test caused a disconnection! Shortly afterwards I checked the Hub Manager Technical log again it appears that I had been re-synced back to my normal speed:

Data rate 9.99 / 42.66 Mbps
Max data rate 11165 / 50464
Noise margin 6.3 / 6.1 dB
Line attenuation 39.7 dB
Signal attenuation 25.5 / 39.7 dB

So what’s going on? Why should doing a Quiet Line Test apparently cause a drop out? And why if immediately after I check the hub stats does my connection show a return to a normal download speed?

Re: Quiet Line Test Causes Drop Out!?

Keith_Beddoe — Sun, 13 Sep 2020 11:12:10 GMT

You have a high resistance connection somewhere, and when you use your phone, the current flowing through the line, is breaking down the poor connection, and restoring your speed.

You need to check from the test socket, to prove whether the bad connection is on the external network.

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Quiet Line Test Causes Drop Out!?

Re: Quiet Line Test Causes Drop Out!?