The SFP-10GB-BX-U-20-ST is a MSA Compliant upstream fiber SFP transceiver which pairs with StarTech.com's SFP-10GB-BX-D-20-ST. They are designed, programmed and tested to work with 10GBase-BX compatible MSA switches and routers. The SFP+ transceiver module supports a maximum distance of up to 20 km (12.4 mi) and delivers dependable 10 GbE connectivity over fiber cabling. Technical Specifications: Wavelength: 1270nmTx/1330nmRx Maximum Data Transfer Rate: 10Gbps Type: Single Mode Fiber Connection Type: LC Connector Maximum Transfer Distance: 20 km (12.4 mi) Power Consumption: Low power consumption DDM: Yes This SFP+ fiber module is hot-swappable, making upgrades and replacements seamless by minimizing network disruptions. StarTech.com SFPs All StarTech.com SFP & SFP+ transceiver modules are backed by a lifetime warranty and free lifetime multilingual technical support. StarTech.com offers a wide variety of SFP+ modules and direct-attach SFP+ Cables, providing the convenience and reliability you need to ensure dependable network performance.