I felt inclined to register an account and leave a comment on this thread, given that incorrect advice has been provided by the community moderator.   The original poster asked if a modem is required in addition to the NCD - it's not. The NCD is the modem. To answer the OP's question, in this scenario, an additional modem isn't required, all he'd need is a router.   I'm aware that i'm resurrecting a thread, but it was the first hit on Google, after searching for 'ASUS RT-AC86U FTTC' and I didn't want others to be mislead.  ... View more