21R9931-AO - AddOn - SFP (mini-GBIC) transceiver module (equivalent to: IBM 21R9931)

4Gb Fibre Channel (LW) - Fibre Channel - LC single-mode - up to 10 km - 1310 nm - for Brocade 300, 5100, 5300, DCX Backbone, Encryption SAN Switch, FR4; SilkWorm 7500, 7600