cyril7:
Hi, pretty sure the Cisco modem is only DOCSIS3.0 not 3.1, so I would expect its replaced, but could well be wrong. The old Surboard is off to the bin, as with the T-box, the T-box will be replaced with the VTV that will use unicast traffic off the internet via the new internet connection (ie DOCSIS3.1)
Cyril
This is correct, a new cable modem (Technicolor TC4400) is supplied. The Ultra Hub is connected to this modem. The Asus router can be plugged into the Lan port of the Ultra Hub.
Instead of an Asus router, I've plugged my AirPort Extreme into the Ultra Hub, and turned off the wifi on the hub. Works just as before the upgrade, but much much faster :D