HP J8177C X121 1Gb SFP RJ45 T Transceiver – Small Form-factor Pluggable (SFP) Gigabit transceiver using 1000BaseT technology – Has one RJ-45 1000BASE-T port – Requires Category 5 100-ohm UTP or STP cable or better

HP J8177C X121 Compatible 1000BASE-T SFP Copper RJ45 100m Transceiver (Copper, 100m, RJ45)