Cisco Part Number: FPR2K-NM-8X1G is a Cisco Firepower 8-port SFP Network Module
Cisco 2120 Firepower Security Appliance:
Cisco 2130 Firepower Security Appliance:
Cisco 2140 Firepower Security Appliance:
Network Modules
The Firepower 2130 and 2140 contain one network module slot that provides optical or electrical network interfaces. Network modules are optional, removable I/O modules that provide either additional ports or different interface types. The Firepower network module plugs into the chassis on the front panel.
You can fit four copper SFPs in either the top row of ports or the bottom row of ports. Both rows cannot be populated at the same time, because of the port row spacing.