Switching the protocol from PPPoA to PPPoE or vice versa should have no effect on your BellSouth gateway router. In the past, it was not uncommon for the gateway router to become "stuck" in PPPOE mode. When that would happen, it was necessary for BellSouth to physically "reset" the router before it would recognize a switch to PPPoA. This problem was addressed in an update to the gateway router's firmware. Although the update apparently did not completely eliminate the problem, it is now extremely rare.