J4859C is a HP X121 1G SFP LC LX Transceiver. It’s a small form-factor pluggable (SFP) Gigabit LX transceiver that provides a full-duplex Gigabit solution up to 10 km (single-mode) or 550 m (multimode).
Intel 10GBASE-SR SFP+ Transceiver Extended Temp. This is a SFP+ (Small Form-factor Pluggable Plus) transceiver module that offers high-speed data transmission for networking applications.
Intel 10GBASE-SR SFP+ Transceiver. This is a small form-factor pluggable (SFP+) transceiver module from Intel. It is designed to provide high-speed connectivity for Ethernet and Fibre Channel applications.