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
HP ProCurve Gigabit-SX-LC Mini-GBIC 1000Base J4858C