Cisco SM-X-6X1G, Interface 6 x RJ-45 10/100/1000Base-TX Network LAN, Twisted Pair, Optical Fiber, Network 10/100/1000Base-TX, 1000Base-X, Data Transfer Rate 1 Gbit/s, Expansion Slots-6, Compatibility Cisco 4000 Series Integrated Services Router. The Cisco Gigabit Ethernet WAN Modules bring high-density Small Form-Factor Pluggable (SFP) and copper (RJ-45) 1 Gigabit and 10 Gigabit Ethernet (GE) connectivity to the Cisco 4000 Series Integrated Services Routers (ISRs).