The AX-320C is a 32 door/sub add-on style exchange unit from Aiphone which is capable of delivering high quality operation within any application it is used for. The AX-320C 32 door sub add-on is capable of being easily used with the AX-248C and the AX-084C, and is also able to be connected to the CEU using the RJ-45 port. This add-on sub is user friendly, easy to install, and comes easy to operate to save time.