1-port 10GBASE-BX20-D (Down-Stream) Bi-Directional (BiDi) Small Form-Factor Pluggable (SFP+) Optics Module, Single Mode Fiber (SMF), 20km, TX: 1270 nm, RX: 1330 nm, LC Connector, Digital Diagnostic Monitor (DDM), RoHS 6/6 Compliant, Temperature -40/85C