Cisco 8140 Installing page 17

Installing Battery Backup Units
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
Discharge Conditions
Duration
Entry to discharge
Exit discharge
1
2
Charge Conditions
Table 2: Battery Backup Unit Charging Specifications
Charge Conditions
Power draw
Entry to charging limit
Exit charging
3
4
Description
4 hours minimum with a 10W power load
1
• 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)
2
• 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)
All conditions met.
Any condition met and system is detected.
Description
No more than 20 W when charging
3
• 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)
4
• 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)
All conditions met.
Any condition met and system is detected.
Router Power Path Selection
Installing Battery Backup Units
17