Nortel Secure Router 3120 4 Port T1/E1 Medium Module (MM) with integrated CSU. Routing protocols: OSPF, Data link protocols: ACL, NAT, GRE Tunneling, IP-IP for GRE. VPN support: -IPSec VPN, NAT-Traversal -Site-to-site and remote access support -DES, 3DES, AES, SHA1, MD5. Certification: Safety: UL/cUL 60950 2000; IEC 60950; EN 60950. Maximum data transfer rate: 0 Gbit/s, Connectivity technology: Wired