Vertiv Avocent ACS 6004, SNMP, TACACS+, LDAP, LDAP/AD, Kerberos, NIS, RSA/SecurID, OTP, PAP/CHAP, 802.1x RADIUS, EAP, SSH, SSH-2, RS-232, Linux Kernel 2.6.12, 17.3 x 9.5 x 1.75" (438.2 x 241.3 x 44.5 mm) Vertiv Avocent ACS 6004. Management protocols: SNMP. Authentication method: TACACS+, LDAP, LDAP/AD, Kerberos, NIS, RSA/SecurID, OTP, PAP/CHAP, Security algorithms: 802.1x RADIUS, EAP, SSH, SSH-2. Console port: RS-232. Operating system installed: Linux Kernel 2.6.12. Dimensions (WxDxH): 17.3 x 9.5 x 1.75" (438.2 x 241.3 x 44.5 mm), Weight: 6.59 lbs (2.99 kg)