Add-ons transceivers are built to meet or exceed the OEMs specifications, and comply with MSA (Multi-Source Agreement) standards. All products are 100% functionally tested. Add-ons industry-standard SFP is a hot-swappable input/output device that plugs into a Gigabit Ethernet slot, linking the port with the fiber-optic network. Add-ons transceivers (GBIC, SFP, XFP and XENPAK) are 100% compliant for all of Add-on networking product lines. Add-on transceivers are factory loaded with OEM specific configuration data required for networking compliance. These transceivers initialize and perform identically to the OEM transceivers and can be mixed and deployed with other OEM or 3rd party transceivers, for seamless network performance. J4859B-AO is an HP compatible SFP module with the following features: 1000BASE-LX, 1310nm Wavelength, LC Connector, Single-Mode Fiber (SMF), up to 10km reach.