The A0315 and the AB-318 are interchangeable. Depending on your setup, the existing dock (or the new one) may only play in a particular zone if connected as a local source, or it may be connected as a main source which would play in all zones. You would have to check how the unit is connected to your system to be sure. You can use the AB-318 in place of the A0315 or AB315 iPod docks, they will not require any different wiring. They both use Cat5 and are powered over that Cat5 with a 24VDC power connection from the source hub/matrix. Be on the lookout for the source hub, usually either a P-1014, P-1044, or an AB-203 plugged into an AB-404. These are where the keypads get their power and usually where the dock would be plugged in with Cat5 if being used as a main source. Click on any of these product numbers to view them on our website.