Cisco SFP-25G-BXU20-I Compatible 25GBase-BX SFP28 Transceiver (SMF, Tx: 1270nm Rx: 1330nm, 20km, LC Duplex, DDM, I-Temp) - Guaranteed Compatible: In System tested in over 90 OEM switches, routers and servers. - 99.98% Reliability Rate: Functionally, optically and environmentally tested to exact specifications. - Industry Leading Lifetime Warranty: For more information by product line, visit our Warranty page. - 98% On-Time Delivery Rate: Extensive inventory guarantees same day shipping. - Full Service Technical Support: Call, chat, email or meet for expert optical connectivity support.