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[snadge]

...notify the DLM that it was dropped by customer turning off the router by switching off, reboot from within WAN interface or just pure drop?...or can it not tell?

the reason i ask is Iam having issues with my speed and the 2nd engineer installed an NTE5C without informing me which I loath as I had a bad experience on my last one has too did many others...

I bought a NTE5A to put back in but could not get the connection up n running no matter what I tried so Im back to the 5C, it must be a dud, it was keep trying to connect but wouldnt, so im guessing the wires where crimped in proper....or it would attempt a load up


the whole point is..if the DLM knows it was a customer turning off the device then it should NOT add a marker to "dropouts"....but if the connection just drops that is marked as a "dropout"

do Routers and DLM's pass each this information?

thanks in advance as always

[kitz]

Dying Gasp is the term you probably mean and most modern modems do support it.

However...   Openreach's DLM takes no notice of any dying gasp messages and uses a different method to detect "Unforced Retrains"
See ~ Detection of sync events

[snadge]

thanks for that Kitz
the plethora of info on this site is unmatched!

[burakkucat]

Interestingly, to pass the MCT a modem (or modem/router) has to send a dying-gasp message.

[ejs]

BT SIN 498 states that dying gasp is not a mandatory requirement.

[Chrysalis]

Interestingly, to pass the MCT a modem (or modem/router) has to send a dying-gasp message.

I expect MCT team is different to another team that manages DLM

[sevenlayermuddle]

From a quick browse at the document I believe to be BT SIN 498 issue 7.5, dying gasp is a ‘should support’ rather than a ‘shall support’.   The distinction matters.

[kitz]

From here

† Note on Dying Gasp - Whilst DLM may not make use of the dying gasp message, nor is it mandatory for MCT; modem manufacturers are encouraged to implement it's use for Openreach's Test and Diagnostic systems. 
This allows ISPs to check EUs have performed a power cycle of the modem prior to a potential engineer visit.  See SIN 498 Section 3.2.5 R.OAM.4.

[sevenlayermuddle]

From here

Perfect summary, and what a useful resource this website is.  If only we could all remember to refer to it.