I'm not sure it confirms what you might hope, though?
Huh? i don't hope anything.
You asked how it worked between DSLAM vendors and I linked you to kitz page that explains it in detail.
The DSLAMs data collector reports its data to an Element Manager using the SNMP protocol.
It includes things like
Line Data
Line Rate - Sync Speed & other bit rate related information
Line Condition - ie Attenuation, SNR Margin, Power.
Fault Finding Info - ie QLN, Hlog
Event Counters
Line Level - ie Initialisations and failed initialisations
xTU Level - Alarm state errors such as LOS, ES, SES, UAS.
Channel Level - Coding violations such as CRC & HEC and corrected blocks (FEC)
Various configuration Parameters
ie Interleaving, INP, Target SNR, SNR Margin, QoS Profiles, Max Line Rate, Min Line Rate.
Those are all xDSL statistics reported by modem/DSLAM, nothing beyond the DSLAM.
I don't really care what you quote me from an article that's years old and that covers huge chunks of the ADSL DLM.
A retrain event is detected by "a RADIUS transaction having occurred" - ie a new authentication event has been recorded on to the BTw network, which is part of the handshake process of synchronisation.
This
must be referring to ADSL.
That's not how NGA DLM works.
You asked about NGA profiles, and I'm telling you how the NGA DLM works.
Like I said previously
A good example is if I have my modem connected in bridge mode, synced to the DSLAM, with no router connected so no PPP.
DLM can and will still act on my line. It's only interested in the xDSL link.
I'll happily restart my router dozens of times without DLM being aware of it.
ADSL is unbundled with multiple DSLAM's operated by multiple providers over multiple DLM systems.
Kits DLM page refers to the BT Wholesale DLM and BT Wholesale control their DSLAM's, the DLM, the BRAS/RADIUS etc.
The NGA DLM can't use PPP/Authentication as the NGA DLM controls every ISP on the DSLAM.
OpenReach don't have control over this info from every ISP in the same way BT Wholesale can control the BRAS for their ADSL DSLAM's.
The NGA system just would not work the way you think it does.