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===Diagnostics you can run from a computer:===
These are tests you can from your computer, some of them (eg the ping) will need you to use a command prompt or terminal to enter the commands. Do get in touch if you need help with how to do that.
# '''View the CQM graph'''
#* We plot loss/latency/traffic graphs and these can be seen on our Control Pages - viewing those is the first port of call, as loss and latency are easily spotted. Feel free to ask our support team to help explain them.
#* There are some example CQM graphs at the end of this page
#* Always worth running a test, even if LOS light is off - there could be a problem further upstream and Openreach may already be aware or we'll need to report a fault:▼
#'''Ping tests:''' <br> running ping tests from the 'command line' can help see if there is any strange loss or latency. <br> ''Expected results'': The ping results should show 0% loss and the latency should be below 20ms, any thing else would need further investigation.
## '''ping your router:''' <br> This will test your local connection. eg, if your router (gateway) is 192.168.0.1 then run this to send 100 pings: <syntaxhighlight>(on windows) ping -n 100 192.168.0.1</syntaxhighlight> <syntaxhighlight>(on Mac) ping -c 100 192.168.0.1</syntaxhighlight> and let us know the last few lines containing the results, which show any loss, the latency and jitter, eg:<syntaxhighlight>
## https://speedtest.aa.net.uk
## https://www.fast.com
# '''iperf''' <br> Ask us about testing with ''''iperf'''' - as this is generally better than http speed test websites. This can test single and multi-thread, upload and download. See: https://support.aa.net.uk/Windows_iperf3 Running an iperf for 10 or 20 minutes is a good idea, as this will then be seen on our CQM graphs, and that may show loss/latency etc, and also run upload and download tests along with single and multiple threads.
## <syntaxhighlight>iperf3 -R -P1 -t 600 -c speedtest.aa.net.uk # Download, singlethread, for 10 minutes</syntaxhighlight>
## <syntaxhighlight>iperf3 -P1 -t 600 -c speedtest.aa.net.uk # Upload, single-thread, for 10 minutes</syntaxhighlight>
## Search Youtube for a '4k test' video, and see if that streams smoothly - there are various nature/landscape videos that are high quality and should stream nicely
# ...'''get in touch'''.
▲Always worth running a test, even if LOS light is off - there could be a problem further upstream and Openreach may already be aware or we'll need to report a fault:
▲* '''Run a test:-'''
▲*# Our Control Page will allow you to run an 'End to End' test, this may if Openreach's systems detect a fault, in which case, do get in touch. eg: <tt>GTC_FTTP_SERVICE_1005 Possible fault in the Openreach network.</tt>
=More advanced topics and areas of investigation=
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