StarTech.com Gigabit Ethernet Fiber Media Converter with Open SFP Slot - Supports 10-100-1000 Networks Dell 5330 2 B-Key onboard sockets that

2 B-Key onboard sockets that support SATA III transfer speeds up to 6Gbps

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it allows you to connect a serial device where connection space is limited

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StarTech.com Gigabit Ethernet Fiber Media Converter with Open SFP Slot - Supports 10-100-1000 Networks Dell 5330 2 B-Key onboard sockets thatThis fiber media converter offers an easy, cost effective way to extend your network over fiber, using the SFP of your choice. It converts a copper RJ45 Ethernet connection to Gigabit fiber to extend your network over longer distances or connect workstations to switches. The converter provides a powerful networking solution for campuses, businesses, government facilities, stadiums, or other areas requiring network access. A cost effective extension