ASA5540-MEM-2GB= 2 GB Memory Upgrade for Cisco ASA 5540
ASA 5585 Rail kit Part Number:ASA5585-RAILS=
ASA 5585-X Spare AC Power Supply Part Number:ASA5585-PWR-AC=
ASA 5585-X Chassis with SSP40,6GE,4SFP+,2GE Mgt,1 AC,DES Part Number:ASA5585-S40-K8
2 GB Memory Upgrade for Cisco ASA 5520 Part Number:ASA5520-MEM-2GB=
ASA 5585-X Chassis with SSP10, 8GE, 2GE Mgt, 1 AC, DES Part Number:ASA5585-S10-K8
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