Revision as of 11:53, 3 July 2023 (view source) AA-Andrew (talk \| contribs) mNo edit summary ← Older edit		Latest revision as of 13:23, 31 July 2024 (view source) Roadhog863 (talk \| contribs) m (Fix dead link)
\|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. [~~http~~[:~~//wiki.aa.org.uk/~~File:Cqm-heating.png \|View a week of these graphs]] Here there is interference as the central heating goes on, the drops are regular - twice a day, at the time the heating goes on. This actually highlighted a fault in the central heating for this customer as the graphs showed no drops for 2 days running! \|}

CQM Graphs (view source)