Axiom 1000Base-BX-U SFP Transceiver for Calix - 100-01668 (Upstream) - For Optical Network, Data Networking - 1 x LC Simplex 1000Base-BX-U Network - Optical Fiber - 1310 nm, 1490 nm - Single-mode - Gigabit Ethernet - 1000Base-BX-U - 1 Gbit/s - 32808.40 ft Maximum Distance: