Lantronix TN-SFP-LXB Series 1000Base-BX BiDi Single-Fiber SFPs

A standard Gigabit fiber link uses two strands, one for each direction. The TN-SFP-LXB modules (also searched as TN-SFP-LXB BiDi or 1000Base-BX SFP) send and receive on different wavelengths over a single strand, so the same fiber plant carries twice as many links, and a single available strand between buildings or along a route can still carry Gigabit Ethernet. Because each end transmits on a different wavelength, modules are deployed in pairs: one end uses the odd-numbered part and the far end the matching even-numbered part.

The 10, 20 and 40 km models pair 1310 nm and 1550 nm, and the 80 km models pair 1510 nm and 1590 nm. Link budgets scale with reach, from 11.0 dB at 10 km to 24.0 dB at 80 km. All modules use a simplex LC connector, are hot-pluggable, comply with the SFP Multi-Source Agreement (MSA) and IEEE 802.3, and include DMI digital diagnostics for monitoring optical power and temperature from the host switch.

Each module draws 0.66 W at 3.3 V. Standard parts operate from 0 °C to 70 °C, and the T-suffix parts extend that to -40 °C to 85 °C for hardened switches and outdoor cabinets. Lantronix lists Gigabit Ethernet switches and routers, Fiber Channel switch infrastructure, xDSL and metro edge switching as typical applications.