| Part | FG 51E | 
		
			| Firewall Throughput | 2.5 Gbps | 
		
			| (1518 / 512 / 64 byte UDP packets) |  | 
		
			| Firewall Latency (64 byte UDP packets) | 180 μs | 
		
			| Firewall Throughput (Packets Per Second) | 375 Kpps | 
		
			| Concurrent Sessions (TCP) | 1.800.000 | 
		
			| New Sessions/Second (TCP) | 21000 | 
		
			| Firewall Policies | 5000 | 
		
			| IPsec VPN Throughput (512 byte) | 90 Mbps | 
		
			| Gateway-to-Gateway IPsec VPN Tunnels | 200 | 
		
			| Client-to-Gateway IPsec VPN Tunnels | 250 | 
		
			| SSL-VPN Throughput | 100 Mbps | 
		
			| Concurrent SSL-VPN Users | 200 | 
		
			| (Recommended Maximum, Tunnel Mode) |  | 
		
			| SSL Inspection Throughput (IPS, avg. HTTPS) | 150 Mbps | 
		
			| SSL Inspection CPS (IPS, avg. HTTPS) | 140 | 
		
			| SSL Inspection Concurrent Session | 75000 | 
		
			| (IPS, avg. HTTPS) |  | 
		
			| Application Control Throughput (HTTP 64K) | 450 Mbps | 
		
			| CAPWAP Throughput (HTTP 64K) | 1.2 Gbps | 
		
			| Virtual Domains (Default / Maximum) | (5/5) | 
		
			| Maximum Number of FortiSwitches Supported | 8 | 
		
			| Maximum Number of FortiAPs | (10/5) | 
		
			| (Total / Tunnel Mode) |  | 
		
			| Maximum Number of FortiTokens | 500 | 
		
			| High Availability Configurations | Active/Active, Active/Passive, Clustering | 
		
			| System Performance — Enterprise Traffic Mix |  | 
		
			| IPS Throughput | 350 Mbps | 
		
			| NGFW Throughput | 220 Mbps | 
		
			| Threat Protection Throughput | 160 Mbps | 
		
			| Interfaces and Modules |  | 
		
			| GE RJ45 Ports | 5 x GE Switch Port | 
		
			|  | 2 x GE WAN Port | 
		
			| GE SFP Slots |  | 
		
			| Management/HA /DMZ Ports |  | 
		
			| USB Ports | 1 | 
		
			| Console Port | 1 | 
		
			| Storage | 1 x 32 GB SSD | 
		
			| Dimensions and Power |  | 
		
			| Height x Width x Length (inches) | 1.44 x 8.52 x 5.5 | 
		
			| Height x Width x Length (mm) | 36.5 x 216 x 140 | 
		
			| Weight | 2.04 lbs (0.925 kg) | 
		
			| Form Factor | Desktop | 
		
			| AC Power Supply | Powered by External DC | 
		
			|  | Power Adapter, 100–240V AC, 50–60 Hz | 
		
			| Power Consumption (Average / Maximum) | 16 / 20 W | 
		
			| Current (Maximum) | 16 / 20 W | 
		
			| Heat Dissipation | 67 BTU/h | 
		
			| Redundant Power Supplies |  | 
		
			| Operating Environment and Certifications |  | 
		
			| Operating Temperature | 32–104°F (0–40°C) | 
		
			| Storage Temperature | -31–158°F (-35–70°C) | 
		
			| Operating Altitude | Up to 7,400 ft (2,250 m) | 
		
			| Humidity | 10–90% non-condensing | 
		
			| Noise Level | Fanless 0 dBA | 
		
			| Compliance | FCC, ICES, CE, RCM, | 
		
			|  | VCCI, BSMI, UL/cUL, CB | 
		
			| Certifications | ICSA Labs: Firewall, IPsec, | 
		
			|  | IPS, Antivirus, SSL-VPN |