HP J4858C ProCurve X121 Gigabit-SX-LC Mini-GBIC SFP Module

A small form-factor pluggable (SFP) Gigabit SX transceiver that provides a full-duplex Gigabit solution up to 550 m on multimode fiber.

• Ports: 1 LC 1000BASE-SX port (IEEE 802.3z Type 1000BASE-LX); Duplex: full only
• Connector type: LC
• Wavelength: 550 nm
• Form Factor: SFP

Further details can be found in this link.