The AC5200 is a smaller version of Vanderbilt’ high-performance IP-based advanced central controller models (AC5100 and AC5102). It can manage up to 40‚000 cardholders. The ACC-Lite has been specially designed to provide a low-cost alternative for smaller or branch installations. It provides one field level network (FLN) channel which is capable of hosting up to 8 doors for access control, monitoring input devices or controlling output devices. Firmware can be easily downloaded or updated via TCP/IP connection without having to visit the controller cabinets. Communication with the host system occurs via a two-port Ethernet switch which provides 10/100Mb LAN connection. This makes it possible to “daisy chain” controllers. TCP/IP communication ensures the fastest possible transaction times between the host system and the field panels. In case of power failure the database on the ACC-Lite is protected in battery-backed memory. This maintains the integrity of the access control data and ensures that the ACC-Lite is back online as soon as power is restored.