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CQM Graphs: Difference between revisions
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The FireBrick 6000 routers we use provide us with Continuous Quality Monitoring of every broadband circuit. This allows us to track the quality of each and every connection in great detail. The router itself produces the graphs in real time, and can also provide csv files with accurate data for each graph.
|Purple on the graph is off line, and this can be short blips if a line loses sync or longer. Notes (pins) are often added to graphs to explain why a line is off line if we know, especially when we are investigating a fault. The notes on this graph told when the BT engineer arrived and left.
|[[File:Cqm-heating-small.png]]
|'''Regular drops repeating every day''' e.g. Central Heating causing drops. [
|}
[[File:CQM-evening-drops.png|none|200px|Evening Drops]]
===Faulty Card in a TalkTalk LTS===
[[File:Cqm-faulty-lts-card.png|none|800px|Card in a TalkTalk LTS ]]
Here we have three days of graphs, you can see packet loss starting at around 2:50AM, which then gets worse two days later and is then fixed.
This was a faulty line card in a TalkTalk LTS - Only a small number of circuits were affected with packetloss due to this though.
The time ties in with logs from TalkTalk's LTS:
<syntaxHighlight>
8 alarms currently active
Alarm time Class Description
2023-06-29 02:57:46 BST Minor FPC 9 Minor Errors
2023-06-29 02:52:29 BST Minor FPC 1 Minor Errors
2023-06-29 02:52:25 BST Minor FPC 10 Minor Errors
2023-06-29 02:52:23 BST Minor FPC 8 Minor Errors
2023-06-29 02:52:22 BST Minor FPC 11 Minor Errors
2023-06-29 02:52:22 BST Minor FPC 0 Minor Errors
2023-06-29 02:52:22 BST Minor FPC 3 Minor Errors
2023-06-29 02:52:02 BST Major FPC 10 Major Errors
</syntaxHighlight>
From 9AM on day 3, the interface that we have with TalkTalk started reporting input discards.
[[File:Discards.jpg|none|400px|Interface discards ]]
The faulty line card was taken out of service, and the packet loss was no longer.
The incident was: https://aastatus.net/42546
=Other Information=
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