I don't see any nexxt accesspoints on their website. Only routers. If you have on of those judging from a quick view on the specs. It would be a no. You would need a more advanced router. I know some draytek routers provide the option. You need a dual wan router with load balancing support.
By the way. The wireless radio operates at 54Mb. But because if half duplex it can either send or receive at a given time. Cutting the speed in half. Wireless protocols and packet loss also reduce the speed. So you'll practically get about 20Mb out of the 54Mb specified.