This is where i read it

1. Check for Wide Area Events

Each day, the DLM Management Device receives sets of data from the DSLAM's element manager. First it will analyse the event data from all lines to check for events such as thunderstorms which may have caused multiple lines to resync and/or generate lots of errors.

If a pre-determined percentage of lines experience retrains and errors in the the same time frame then any events occurring in that time frame will be classed as a Wide Area Event.

Documentation would suggest that the percentage values for wide area events are: >20% of users with uptime experienced a resync OR >50% of users with uptime experiencing errors && >10% of users with uptime experienced a resync.

So attempting to put it in simple terms, if data in the binary file in any of the 15 min bins at the same time frame meets any one of the following two criteria:

> 20% of bins are [1,1,1] OR [1,1,0]
> 50% of bins are [1,0,1] AND >10% of bins are [1,1,1]||[1,1,0]

then a wide area event is declared for that period. Data from any bin within the corresponding time frame is discarded and not used for the DLM calculation.

https://kitz.co.uk/adsl/DLM.htm

OK thanks for this info, so it doesn't specifically detect lighting, just looking for a mass of line re-syncs and/or a mass of line errors in a 15 minute window that meet pre-determined thresholds.

Edited by PCJM40 (Mon 02-Oct-23 22:40:33)

Yea, although lightning and powercuts are the most likely culprits

Even if it’s always been on 16to1 when I had lower speeds 40 10. Since they upped them to 70 20, the only time I’ve ever seen it at 8to1 was the implementation of the service, and it’s just really bad luck that the power went twice in quick succession.

In reply to a post by JAMSROO777:

Even if it’s always been on 16to1 when I had lower speeds 40 10. Since they upped them to 70 20, the only time I’ve ever seen it at 8to1 was the implementation of the service

The line may already have been on the tipping point, If the line is clean enough it will revert, if not it won't

Thanks, I’ve noticed the sky Q box is causing packet loss, would this have any bearing on the stability of the line?