Here's a strange happening that has me baffled..............
I have recently been remotely monitoring a poor 2000m+ VDSL2 connection.
These are the resyncs since we started monitoring:-
29/01/2014 12:26 - RESYNC detected (DS 4695 Kbps, US 295 Kbps), AS = 40, Retrain Reason: 1
29/01/2014 16:50 - RESYNC detected (DS 4695 Kbps, US 304 Kbps), AS = 52, Retrain Reason: 1
30/01/2014 04:51 - RESYNC detected (DS 928 Kbps, US 416 Kbps), AS = 12, Retrain Reason: 1
30/01/2014 05:10 - RESYNC detected (DS 4695 Kbps, US 314 Kbps), AS = 51, Retrain Reason: 1
31/01/2014 04:48 - RESYNC detected (DS 6397 Kbps, US 314 Kbps), AS = 49, Retrain Reason: 1
The 04:51 resync of 30th January was at very low speed indeed.
Looking at the resync logs, it appears it was so low because it had actually resynced in G.DMT ADSL mode.
It only lasted until 05:10 though before reverting to VDSL2 mode.
I have attached a snapshot montage for the G.DMT period and another from 06:00 30th January when it was back in VDSL2 mode.
Do any of you have any ideas why/how that could have happened?
Just fiddling about, I have previously attempted to force my own VDSL2 connection into the various ADSL modes without any success.
EDIT:
The connection also exhibits symptoms of bridged tap(s) in the Hlog graphs, hardly noticed at ADSL frequencies.