Hi Joyce, You certainly can use your own personal router with the MTS equipment. It just needs to be configured to use DHCP and the PPPoE connection would be setup in the modem itself. The downside to doing this is your own router would not be supported by our technical support team.
I thought the currently VDSL/VDSL2 setups had moved away from PPPoE. Further, I thought the recommended configuration for a customer owned router is to configure it to use the DMZ Plus setting on the 2Wire gateway,