The 1000BASE-BX-D 40km TX1490nm/RX1310nm Simplex LC/UPC BiDi SFP Optical Transceiver Module is a high-performance, cost-effective SFP transceiver designed for Gigabit Ethernet single-fiber bidirectional transmission. It transmits data at 1490 nm and receives at 1310 nm, enabling full-duplex communication over a single strand of singlemode fiber (SMF) for distances up to 40 kilometers.