The 10056-ST is an Extreme Networks 10056 compatible downstream fiber SFP transceiver which pairs with Star Tech.com's 10057-ST. They are designed, programmed & tested to work with 1000 Base-BX-D compatible Extreme Networks switches & routers. The SFP transceiver module supports a maximum distance of up to 10 km (6.2 mi) & delivers dependable 1 Gb E connectivity over fiber cabling. This SFP fiber module is hot-swappable, making upgrades & replacements seamless by minimizing network disruptions. Star Tech.com offers a wide variety of SFP modules & direct-attach SFP Cables, providing the convenience & reliability you need to ensure dependable network performance.