Cisco Catalyst 6840 Series Hardware Installation Manual page 66

Power Supply Overview
Figure 26: Cisco Catalyst 6840-X DC Input Power Supply
The switch chassis has two slots in which you can install power supplies using any of the following
combinations:
• Two AC-input power supplies
• Two DC-input power supplies
• One AC-input power supply and one DC-input power supply
• One AC-input power supply (leaving the blank cover on the other slot)
• One DC-input power supply (leaving the blank cover on the other slot)
Note
If you leave any power supply slots empty, you must ensure that the blank cover is installed in that slot to
maintain the designed airflow.
This table lists the power supply models.
Part Number
C6840-X-750W-AC=
C6840-X-750W-DC=
C6840-X-1100W-AC=
C6840-X-1100W-DC=
The power supplies can work together in Redundant Mode, in which each power supply operates at
approximately 50 percent of its capacity, no greater than 60 percent and no less than 40 percent. If one power
supply fails, the other power supply can provide power for the entire system on its own. This is the default
and recommended mode for production.
Catalyst 6840-X Switch Series Hardware Installation Guide
54
Installing and Removing Power Supplies
Description
Cisco Catalyst 6840-X power supply AC-750W
Cisco Catalyst 6840-X power supply DC-750W
Cisco Catalyst 6840-X power supply AC-1100W
Cisco Catalyst 6840-X power supply DC-1100W