ZYXEL 91-010-203001B Zyxel SFP-LX-10-D 1G SFP LC LX Single-Mode Transceiver 1310nm, 10km range

ZyXEL's Small Form-factor Pluggable (SFP) transceiver family provides performance and flexibility with full duplex Gigabit speeds and hot-pluggable into Gigabit Ethernet port.
ZyXEL's SFP transceiver's compact design provides high port density. ZyXEL's SFP transceiver family is compliant with IEEE 802.3z and SFP MSA allowing easy interoperability with all standard compliance devices from different vendors.