2-port 10GBASE-T module provides 2 dual-speed 1000BASE-T or 10GBASE-T RJ-45 ports; can also be used for low cost stacking. For use with HP 5120 EI, 5500 SI, 5500 EI, and 5500 HI switches. 100m over Cat 7 or Cat 6a. : Up to 100m distance using RJ-45 copper.*55m over Cat 6 / Cat 5e IRF stacking scalablility: work with HP IRF stacking cable to provide virtual chassis solution