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Slow ADSL CQM: Difference between revisions
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You can take a look at your graph and compare it to the examples below to see if there is a match.
{{CPbox|#Click on the line you want to view
#Clicking on the graph again will show a 7 day's worth of graphs with options there to view 30 and 60 days}}
=Examples=
Below are a few examples of slow lines and their graphs.
==Lots of traffic on the line==
[[File:CQM-FTTC-upload.png|none|frame|Lots of upload in the morning - a backup without any traffic shaping on the client end. This will make the line slow, but is not a fault]]
This line is doing a large backup from just before 6am. The dark red horizontal line shows the traffic, during this time there is lots of packet loss (red) and the light blue at the bottom is showing high latency. So, whilst the backup is happening the line has about 50% packet loss and around 300ms of latency. Using the line for things like web browsing at this time will be slow and sluggish. However, this is not a fault per-se. It is normal for a line to appear slow when it's being filled with traffic.
However, this traffic may be unknown, it may not be a backup, but could be a virus or peer-to-peer traffic, or almost anything!
===Dealing with Lots of traffic===
#Try to identify what the traffic is: You can do a [[Traffic Capture]]
#If it's upload traffic, try unplugging devices on the network until the traffic stops
#Contact Support for further help
==Packet loss on the line==
[[File:CQM-heavyloss.png|none|frame|Heavy packetloss. Packet loss on an idle line is always bad news...]]
[[File:CQM-lowloss.png|none|frame|...even if only 1% (one red dot at the top is 1%).
If you suspect you have packet loss, also see:
*[[Packet Loss]] - a page with more (slightly technical) details about packet loss
*[[CQM Graphs#
===Dealing with Packetloss===
[[File:CongestionTT.png|none|Frame|Congestion in the evenings, latency occurs in the evenings, during the day is fine]]
===Dealing with Congestion===
==What Next==▼
#Contact Support
==Line dropped and speed changed==
[[File:CQM-speed-change.png|none|frame|line dropped and came back slower and with higher latency]]
This line dropped at 01:50, and came back within a minute or two, however, the speed has dropped (horizontal black line at the top) and also the latency (blue at bottom) has increased. There could be a fault here, but in this case we can clearly see that something has happened. If your line has changed in speed and is shown on the graphs, then diagnostics may find a fault, and the Support Team can help.
▲==What Next?==
Go to the next step on [[:Category:Slow ADSL|Slow ADSL Page]].
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