Cisco 1000BASE-BX-20U SFP (mini-GBIC) Transceiver easy-to-install module that provide a simple way to add fiber connectivity or to add an extra Gigabit Ethernet port to your Cisco Small Business or Cisco Small Business Pro Series switches. The transceiver available for single-mode fiber-optic cabling and can support distance up to 40 kilometers.
1000Base-BX-20U SFP (mini-GBIC) Transceiver
