StarTech Gigabit Fiber SFP Transceiver Module, HP J4858C Compatible, MM LC with DDM, 1804 ft (J4858CST)100% HP Compatible. Guaranteed. The J4858CST is an HP J4858C compatible fiber transceiver module that has been designed, programmed and tested to work with HP brand compatible switches and routers. It delivers dependable 1 GbE connectivity over fiber cable, for 1000BASE SX compliant networks, with a maximum distance of up to 550 m (1804 ft). This SFP module is hot swappable making upgrades and replacements seamless by minimizing network disruptions.