The AX-16SW is a master add-on selector designed to expand the AX Series intercom system, enabling control of up to 16 additional doors or sub stations. This versatile expansion module mounts directly to the AX Master Station or other AX-16SW units using included brackets, creating a seamless wiring hub via CAT-5e cabling. Supporting up to 7 units for a total of 112 additional doors or subs, it centralizes system control through 4 RJ45 master station ports. Ideal for large installations, the AX-16SW ensures scalable and efficient communication management within the AX telephony system.