Cisco GLC-BX120-U Compatible 1000BASE-BX SFP Transceiver Module (SMF, 1490nm-TX/1550nm-RX, 120km, LC, DOM) compatible with Cisco Nexus 9300 Series (Switch/Module : N9K-C9396PX; Uplink Module : N9K-M12PQ ), Cisco ASR 9000 Series (Modular Line Card : A9K-MPA-20X1GE), etc.