- Expansion module
- RS-232/449/530/V.35/X.21 x 16
- for Integrated Services Router 4321
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.