Installation ManualH3C S5100-SI/EI Series Ethernet Switches Chapter 1 Product Overview1-35Item ModelXFP-SX-MM850XFP-LX-SM1310XFP modulesXFP-LH40-SM1550-F1XENPAK-SX-MM850XENPAK-LX-SM1310XENPAK optical modulesXENPAK-LH40-SM1550Note:z You are recommended to use H3C's optical modules for the S5100-SI/EI seriesEthernet switches.z Only the S5100-26C-EI, S5100-50C-EI, S5100-26C-PWR-EI, andS5100-50C-PWR-EI switches support XFP optical modules, but these switches donot support the XFP modules that require -5.2 V power supply.z Only the S5100-26C-EI, S5100-50C-EI, S5100-26C-PWR-EI, andS5100-50C-PWR-EI switches support XENPAK optical modules.z BIDI modules must be used in pair. For example, if an SFP-GE-LX-SM1310-BIDI isused at one end, an SFP-GE-LX-SM1490-BIDI module must be used at the otherend. 100 M BIDI modules must also be used in pair.z For detailed SFP module specifications, see H3C Low-End Series EthernetSwitches Pluggable Module Manual.1.7 Ordering 10 G Stack Interface ModulesTable 1-16 Ordering information for 10 G stack interface modulesModel No. DescriptionLS5M1XS1PA Single-port 10 G Ethernet stack interface board (STACK)Note:Only the S5100-26C-EI, S5100-50C-EI, S5100-26C-PWR-EI, and S5100-50C-PWR-EIswitches support 10 G stack modules.