I currently have Fios internet only (75 mbps) coax connected from old Tellabs 612 to G1100. Because it's old and I just happen to have latest I-211M-L, I was thinking about replacing it for possible speed upgrade down the road. In fact, it's been already setup (ethernet instead of coax) that only thing I need to do is disconnect fiber cable and connect to new ONT. Is this self ONT replacement feasible?