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This is the support site for Andrews & Arnold Ltd, a UK Internet provider. Information on these pages is generally for our customers but may be useful to others, enjoy!

Slow ADSL CQM: Difference between revisions

Slow ADSL CQM (view source)

Revision as of 11:24, 10 March 2015

58 bytes removed ,  10 March 2015
m
→‎Packet loss on the line
Packet loss is shown as dripping red from the top on the graph. Here are some examples:
 
[[File:CQM-heavyloss.png|Heavy packetloss.]]
[[File:Cqm-VPcongestionOrfault.png|none|frame|Packet loss when a downloading but not filling the line]]
 
Packet loss on an idle line is always bad news...
This is a rather strange one. There is packetloss when downloading, however the download is not filling the link, but there is still loss, this is unusual. This turned out to be congestion on the Virtual Path within BT, or it may have been miss-configured. It took our escalation staff 3 months to convince BT that the fault was within their network.
 
[[File:CQM-lowloss.png|border|An FTTC line with 1-3% loss]]
In this case, talk to Support.
 
...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#Heavy_Packetloss]] - Our general page about graphs with Packet Loss examples
 
[[Category:Slow ADSL|3]]
AA-Andrew
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