This Fast Ethernet SFP transceiver enables the 100BASE-BX10-U connection of a 100BASE-BX link. For each 100BASE-BX10 link, one end must be terminated in 100BASE-BX10-D, and the other in 100BASE-BX10-U, for the link to work correctly.
This SFP can be used only in the 3Com Switch 5500-EI 28-Port FX, for its 100Mb connections.