The J4858CST product is a compatible fiber transceiver form with J4858C HP, designed, scheduled and tested to operate with HP® brand switch and router. It offers a reliable 1 GBE connectivity via fiber cable for networks compatible with 1000base-SX, at a maximum distance of 550 m. Technical specifications: wavelength: 850 nm Maximum data transfer speed: 1.25 Gbps Type: Multi-edeal Fiber type of connection: Lk connector maximum transfer distance: 550 m MTBF: 3.381,761 Energy consumption: less than 1.3 Watt function DDM (Digital diagnostics monitoring): yes equipped with hot-summer function, this form for fiber SFP allows Perform updates and replacements without problems, minimizing network interruptions to a minimum.  Startech.com SFP transceiver all SFP and SFP+ Startech.com transceiver modules are covered by a guarantee and free technical support for life. Startech.com offers a wide range of SFP modules and SFP cables with direct connection that ensure reliable network performance with the utmost trust and practicality.