Product Description : 

FortiGate 7040E Chassis

The FortiGate 7040E is a 6U 19-inch rackmount 4 slot chassis with a 80Gbps fabric and 1Gbps base backplane designed by Fortinet. The fabric backplane provides network data communication and the base backplane provides management and synch communication among the chassis slots. Power is provided to the chassis using three hot swappable 2+1 redundant 100 240 VAC, 50-60 Hz power supply units (PSUs). You can also optionally add a fourth PSU. The FortiGate 7040E can also be equipped with three or four DC PSUs allowing you to connect the chassis to  48V DC power

FPM 7620E FPM modules
The FPM-7620E modules are hot swappable processor modules that provide FortiOS firewalling and security services. The FPM modules function as workers, processing sessions load balanced to them by the FIM  modules.FPM modules include multiple NP6 network processors and CP9 content processors to accelerate traffic.

FortiGate 7040E back panel
The FortiGate-7040E chassis back panel provides access to three hot swappable cooling fan trays and three hot swappable AC or DC PSUs. A fourth slot is available for including a fourth PSU for additional redundancy. At least two PSUs (PWR1 and PWR2) must be connected to power. PWR4 is a backup power supply