Arris tg1682g MOCA

I'm trying to set up a MOCA to span wired connection across the house. My router, the Arris tg1682g, says it has built in MOCA, does that mean I only need one adapter for the other end of the house or do I still need two adapters, one for the other end and one for the router? It seems I only need one, but was hoping to get some assurance before I start a new project and want to run into as little frustration as possible.