Cisco Nexus 7702 Hardware Installation Manual page 16

Planning for Power Requirements
You must also ensure that the circuit used for the switch is dedicated to the switch to minimize the possibility
of circuit failure.
When you know the amount of power that is required for operations (available power) and redundancy (reserve
power), you can plan for the required number of input power receptacles with reach of the switch location.
Step 1 Determine the power requirement for the switch by summing the maximum wattage for each installed module (see the
following table).
Component
Supervisor Modules
Supervisor 2 Enhanced (N77-SUP2E)
F3 I/O Modules
48-port 1- and 10-Gigabit Ethernet I/O module (N77-F348XP-23)
24-port 40-Gigabit Ethernet I/O module (N77-F324FQ-25)
12-port 100-Gigabit Ethernet I/O module (N77-F312CK-26)
M3 I/O Modules
48-port 1- and 10-Gigabit Ethernet I/O module (N77-M348XP-23L)
24-port 40-Gigabit Ethernet I/O module (N77-M324FQ-25L)
12-port 100-Gigabit Ethernet I/O module (N77-M312CQ-26L)
Fan Tray (N77-C7702-FAN)
Step 2 Determine the number of power supplies needed for the available power requirement by dividing the power requirement
amount (see Step 1) by the output wattage of the power supplies installed in the switch.
Step 3 Select one of the following power modes to determine the number of additional power supplies required for reserve
power:
• Combined power—Do not add any power supplies to the number of power supplies calculated for the available
power in Step 2. This power mode does not provide power redundancy, so no extra power supplies are needed.
• Power supply redundancy (n+1 redundancy)—Add one power supply (reserve power supply). This form of power
redundancy provides a reserve power supply that can replace any active power supply that goes offline.
• Input source redundancy (grid redundancy)—Add enough power supplies (reserve power supplies) to at least equal
the total output of the active power supplies (number of power supplies calculated in Step 2). Typically, you would
double the number of power supplies. You must plan for a second power source for the reserve power supplies.
Cisco Nexus 7702 Hardware Installation Guide
6
Preparing the Site
Quantity Maximum Typical
Power Power
1 — —
265 W 137 W
1 — —
480 W 450 W
740 W 650 W
730 W 640 W
— —
560 W 500 W
750 W 700 W
1095 W 800 W
1 300 W 50 W