SFP Optical Transceiver Modules, Single Mode, CWDM-SFP-1490-40, 40KM 1000BASE-CWDM, 1490nm LC Connector, 1.25G, Cisco CompatibleComparable to Cisco's CWDM SFP 1490 40 and compatible with Cisco switches. Description 1. 25G Fiber Channel SFP Optical Transceiver Modules, CWDM SFP 1490 40, 1000BASE CWDM, 1490nm SMF, up to 40 Kilometers, LC, Cisco Compatible A CWDM SFP is a hot swappable input output device that plugs into an SFP port or slot of a switch or router, linking the port with the fiber optic network. The CWDM SFPs are multirate parts that support both Gigabit Ethernet