The AC-825IP is a state-of-the-art 4-door networked access controller and is the backbone of a medium-scale to high-scale security system. The controller comes with one onboard expansion slot and can be further expanded by connecting up to 16 expansion boards via OSDP. Using only D-805 door expansion boards, a single AC-825IP can handle up to 72 doors and 300,000 users. Driven by AxTraxNG™ – Rosslare’s powerful, flexible, and easy-to-use software – the system provides an ideal modular and expandable solution for commercial and institutional needs.