The Cisco Small Form-Factor Pluggable (SFP) and X2 devices for use on the Cisco MDS 9000 Family are hot-swappable transceivers that plug into ports on the Cisco MDS 9000 Family director switching modules and fabric switches. These transceivers give users the flexibility to choose different cabling types and distances on a port-by-port basis.The Cisco 4-Gbps Fiber Channel SFPs are designed to provide cost-effective Fiber Channel connectivity for the Cisco MDS 9000 Fiber Channel switching modules.