7-15
Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter7 Environmental Moni toring and Power Management
Power Management
Power Summary Maximum
(in Watts) Used Available
---------------------- ---- ---------
System Power (12V) 140 1360
Inline Power (-50V) 0 1850
Backplane Power (3.3V) 0 40
---------------------- ---- ---------
Total 140 (not to exceed Total Maximum Available = 2100)
Switch# show power
•
As with other power supplies, the two power supplies must be of the same type (4200 W AC or 1400 W
DC). Otherwise, the right power supply will be put in err-disable state and the left one will be selected.
In addition, all the inputs to the chassis must be at the same voltage. In redundant mode, the inputs to
the left and right power supplies must be identical. If the left and right power supplies are powered in
redundant mode, the power values will be based on the weaker of the two power supplies.
Note When the system is powered with a 4200 W power supply either in 1 10V or 220V combined mode
operation, the available power is determined by the configuration of the system (t he type of line cards,
the number of line cards, number of ports consuming inline power etc.) and does no t reflect the absolute
maximum power.
Note In a matched redundant power supply configuration, if a power supply sub-module fails, the other (good)
power supply will provide power to its full capability.
Table 7 -4 illustrates how power supply is evaluated in redundant mode.
In combined mode, all the inputs to the chassis must be at the same voltage.
Table 7 -5 illustrates how power supply is evaluated in combined mode.
Table7-4 Power Output in Redundant Mode
Power Supply 12 V 3.3 V -50 V Total
110 V 660 40 700 1050
110 V+110 V
or 220 V
1360 40 1850 2100
220 V+220 V 1360 40 3700 4200
Table7-5 Power Output in Combined Mode
Power Supply 12 V 3.3 V -50 V Total
Both sides (bays) at 110 V 1200 40 1200 1873
One-side 110 V+110 V,
other side 110 V
1360 40 2000 2728
Both sides at 110 V+110 V 1360 40 3100 3782
Both sides at 220 V 1360 40 3100 37 82