HP J4858C SFP 1Gb Gigabit 1000BASE-SX 850nm MMF Transceiver Module
Amazon.com: HP J4858C X121 1Gb SFP SX Transceiver - Small Form-factor Pluggable (SFP) Gigabit SX transceiver that provides a full-duplex Gigabit solution up to 550m (1804ft) on multimode fiber - Has one