I understand that all ISP using a custom firmware and TR69 will have their own way of doing it and I can only say what I see.
I do not now have a PN Hub 1 to check but the Zyxel 3925, probably supplied by John Lewis, following a reboot deletes all user information and returns it to "new out of the box" condition.
I connect it to a computer but not to a x-dsl line and login using the default user & password.
Under the broadband setup page there are three interface options, adsl, vdsl & ethwan.
All three have the same setups of user name of kctr69 and a password and as previously said it will not connect when plugged into the line.
This in it's self is not surprising or of a great problem to me although I was hoping for a firmware update. ( the object of the exercise )
A fail here leads to trying the quick start option and for clarity I repeat the options here.
1 time zone
indicates on that page it's currently set to PPPoA (?)
2 username & password
3 fixed or dynamic ip address
4 Enable wireless.
I connect the line and enter the information in the 4 places and it will still not connect.
I checked the three interfaces setups and "my choices" were only entered in the Adsl section and the tr69 settings remained in the other 2 (?)
However it is expected to work, it's clear that the router firsts intended/needed to "auto discover" which of the three interfaces was active, which it clearly did not do although it appears to work now in all other aspects.
OR..........
IF some "indication" from the Dslam indicating " active" was not forth coming. ( contentious thought )
I should also add that I have never attempted a TR69 function connection with my Hub 1 preferring a manual setup.
(?) But, if auto discover had worked, it might have set default to PPPoE in quick start, put "my choices" in Vdsl and it would have connected, if it could resolve the vlan settings correctly, ( which were disabled and blank ) or it may have added another question.
I'll reword my original question, slightly...............
When using a rebooted, to new supplied condition, router with Adsl/Vdsl combined interface and set-up with a TR69 auto login function what information, other than user/password, is passed back to the router ?
ejs comments..........
"because they load different firmware for VDSL2 and ADSL. If other modems need to reset bits of themselves internally while preparing for one or other mode, then they don't make it so obvious."
As my Zyxel had not auto discovered it was connected to a Vdsl line what, it anything, might it be missing and possibly affecting it's performance ?.