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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
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Amazon.com: HEWLETT PACKARD COMPUTER J4858C Discontinued by Manufacturer, 1G SFP LC SX TRANSCEIVER - SMA, X121, Network TRANSCEIVER : Electronics
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