Cisco DS-SFP-FC4G-SW= network transceiver module Fiber optic 4000 Mbit/s 850 nm

The Cisco® Small Form-Factor Pluggable (SFP), Enhanced Small Form-Factor Pluggable (SFP+), and 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 and fabric switches. These transceivers give users the flexibility to choose different cabling types and 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), and 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.