Axiom 1000BASE-BX20-D SFP Transceiver for MSA - S20-BXD53-AX (Downstream) - For Data Networking, Optical Network - 1 x LC 1000BASE-BX20-D Network - Optical Fiber - 1550 nm, 1310 nm Wavelength - Single-mode - Gigabit Ethernet - 1000Base-BX20-D, 1000Base-BX-D, 1000Base-BX-U, 1000BASE-BX10-U - 1 Gbit/s - 20 km Maximum Distance: