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The type of third party device that will work with the NBN HFC service is a VDSL modem/router.
You need to make sure that the VLAN ID can be set up to '2', then the connection type should be PPPoE and the authentication method should be 'PAP'. Make sure that the correct TPG username and password is used to configure the device.
That's basically it to configure a third party device.
Let us know if you need further assistance.