The Cisco Small Form-Factor Pluggable (SFP), Enhanced Small Form-Factor Pluggable (SFP+), & X2 devices for use on the Cisco MDS 9000 family of products are hot-swappable transceivers that plug into ports on the Cisco MDS 9000 family director switching modules & fabric switches. These transceivers give users the flexibility to choose different cabling types & distances on a port-by-port basis. Cisco 4-Gbps Fibre Channel SFPs The Cisco 4-Gbps Fibre Channel SFPs are designed to provide cost-effective Fibre Channel connectivity for the 1/2/4-Gbps ports on the Cisco MDS 9000 family platform. There are three types of Cisco 4-Gbps Fibre Channel SFP: the Cisco Fibre Channel Shortwave SFP (part number DS-SFP-FC4G-SW), the Cisco 4-km Fibre Channel Longwave SFP (part number DS-SFP-FC4G-MR), & the Cisco 10-km Fibre Channel Longwave SFP (part number DS-SFP-FC4G-LW). Each product offers 1/2/4-Gbps autosensing Fibre Channel connectivity.