Cisco Firepower 8140, Installing

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Router Power Path Selection
During normal operation, the router is powered by the integrated AC power supply. The BBU enters discharge
mode and begins providing power to the router when the AC power is interrupted outside a range of 85V to
250V for more than 20 ms. The BBU charges or discharges only; it does not support both simultaneously.
Discharge Conditions
Table 1: Battery Backup Unit—Discharging Specifications
Description Discharge Conditions
4 hours minimum with a 10W power load Duration
• AC power (range of 85V to 250V) not detected for more than 20 ms
• Remaining BBU capacity >5%
• External ambient temperature is within -40 to 122°F (-40 to 50°C)
Entry to discharge
1
• AC power restored in the range of 85V to 250V for more than 20 ms.
• Remaining BBU capacity <5%
• External ambient temperature is outside the range of -40 to 122°F (-40 to
50°C)
Exit discharge
2
1
All conditions met.
2
Any condition met and system is detected.
Charge Conditions
Table 2: Battery Backup Unit—Charging Specifications
Description Charge Conditions
No more than 20 W when charging Power draw
• State of Charge (SOC) <85%
• AC power detected in the range of 85V to 250V for more than 20 ms.
• External ambient temperature is within -4 to 104°F (-20 to 40°C)
Entry to charging limit
3
• AC power (range of 85V to 250V) not detected for more than 20 ms.
• External ambient temperature is outside the range of -4 to 104°F (-20 to
40°C)
Exit charging
4
3
All conditions met.
4
Any condition met and system is detected.
Installing Battery Backup Units
17
Installing Battery Backup Units
Router Power Path Selection