Unfortunately they only have instructions for VDSL...
From Vodafone's web site - http://help.vodafone.co.nz/app/answers/detail/a_id/5239
(Check the other drop downs if you were a Paradise or Clear customer - I don't know if this is still relevant)
Login your username (the first part of your Vodafone email address eg. firstname.lastname@example.org)
Password your password (lower case) [not sure why it says lower case, a password should be a password]
PPP: PPP over ATM (RFC2364)
VCMUX: encapsulation enabled
Preferred DNS 18.104.22.168
Secondary DNS 22.214.171.124
It would suggest you DO need a username and password - maybe follow the link for resetting the password if you don't know it. If you believe the CSR is correct (I have no idea, however past experience would suggest they aren't always correct) put _something_ in these fields even if it's user for username and password for password
Obviously you'd pick ADSL not VDSL if you're looking at the PBTech site
You may not have to fill DNS entries - the "Internet connection type" will be PPPoA (PPP over ATM)
What issues were you actually having with your connection? Is it just speed? WiFi performance?
janeybick: Issue was speed and inability to connect to internet, even sat next to modem! Tried that Vodafone help setup and get the spinning wheel of death and no internet connection, although Vodafone still adamant that no login should be needed trying customer number as username and normal password. They claim they're not trained in third party routers and can't help!
I guess you can't expect them to support every modem that ever existed but they must have access to settings like VCI 0, VPI 100, PPPoATM VCMUX, Annex A, MTU 1492 etc etc
It's concerning their own help pages offer different advice to their CSRs on the settings
ADSL should look like below, it is the most simple to configure compared to VDSL and Fibre as it can all be done in the "Basic" configuration screen and you do not need to go into "Advanced".
To be perfectly honest the Ultrahub should actually be better than your TP-Link. If you're on ADSL the likely reason is you're simply maxing out your connection.
Without posting your address - around where are you based? There are likely solutions to get better speeds. I'm happy to look into some options if you flick me a private message with your address also.