westell router

Hello everyone..
i have a westell versa Link router. it has 4 Ethernet ports and one DSL port for the uplink. But i have a wimax internet and its wireless … RJ-45 connector is coming from the device of the service providers. but the port of dsl which is in the router is Rj-11 small port. i want to use this router with my wimax internet of RJ-45 connector.. what can i do?
thanks