SM-X-4X1G-1X10G= - Cisco 4-Port High-Density Gigabit or 1-Port 10 Gigabit Ethernet WAN Service Module

Expansion module - enhanced service module (SM-X) - combo Gigabit SFP x 4 + 10 Gigabit SFP+ x 1 - for Cisco 4451-X; Integrated Services Router 4331, 4351