There are multiple "universal data" (UNI-D) ports available (4 in total) which can consist of different internet services from different providers. You could have one for business and one for home, or potentially use it if you were swapping from one ISP to another (although I doubt this is a model which is used often).
Might even be able to get creative with a primary internet service and then a pay as you go or pause-able service on the second port in case your RSP goes Optus at an inconvenient time
