Cisco 2112 WLAN Controller. Management protocols: SNMP 1, RMON, Telnet, SNMP 3, SNMP 2c, HTTP, HTTPS, Supported network protocols: TCP/IP, UDP/IP, ICMP/IP, Data link protocols: Ethernet, Fast Ethernet. Authentication method: RADIUS, X.509. Dimensions (WxDxH): 200 x 175 x 45 mm, Weight: 1800 g. Power requirements: 120/230V, 50/60 Hz. Operating temperature range (T-T): 0 - 40 °C, Operating relative humidity range: 10 - 95 %