The 1000BASE-BX-D SFP module operates at wavelengths of 1490 nm TX/1310 nm RX, and the 1000BASE-BX-U SFP module operates at wavelengths of 1310 nm TX/1490 nm RX. As networks continue to expand across campuses, access networks, and metro infrastructure, efficient use of fiber resources has become increasingly important. These two SFP modules are used together to permit a bidirectional GE (Gigabit Ethernet) connection using a single strand of SMF cable and LC connectors. It. BX-D and BX-U (BiDi) – These optical transceivers use one optical fiber instead of two for the standards which are mentioned above. Their main differences lie in transmission distance, wavelength. Media (fiber vs copper), wavelength, reach, connector, temperature grade, and even application domain (Ethernet, SONET/SDH, PON, Fibre Channel) all matter. Use the tables below to pick the exact 1G SFP you need—then sanity-check with the ordering checklist at the end.
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