Cisco WAN Network Interface Module - Serial adapter - RS-232/449/530/V.35/X.21 x 4 - for Cisco 4451-X

Cisco Gigabit Ethernet WAN Modules bring high-density Ethernet connectivity to the Cisco 4000 Series Integrated Services Routers (ISRs). Providing maximum flexibility, the modules accelerate applications such as Ethernet WAN access, inter-VLAN routing, and high-speed connectivity to LAN switches and servers.