Cisco Nexus 7706 Hardware Installation Manual page 18

Planning for Power Requirements
Table 1: Power Requirements for the Cisco Nexus 7706 Switch Modules
Component
Supervisor Modules
Supervisor 2 Enhanced (N77-SUP2E)
F2 I/O Modules
48-port 1- and 10-Gigabit Ethernet I/O module (N77-F248XP-23E)
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)
Fabric Modules (N77-C7706-FAB-2)
Fan Trays (N77-C7706-FAN)
For example, if you are installing a switch with two Supervisor 2 modules (2 x 265 W), four 48-port 10-Gigabit Ethernet
I/O modules (4 x 500 W), six fabric modules (6 x 150 W) and three fan trays (3 x 600 W), the power requirements for
this switch would be 5230 W.
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.
For example, if you are installing a switch with 3-kW power supplies and have a consumption of 5230 W, you need two
power supplies (5230 W / 3000 W = 1.74 or 2 power supplies) to operate the switch and all of its modules.
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.
For example, if you calculate that you need two 3-kW power supplies for 6 kW of available power, you need another
two 3-kW power supplies for 6 kW of reserve power (for a total of four 3-kW power supplies used for available
and reserve power).
Cisco Nexus 7706 Hardware Installation Guide
8
Preparing the Site
Quantity Maximum Typical
1 or 2 — —
(same
type if
265 137
using 2)
1 to 4 — —
(can mix
types)
500 451
— —
480 450
740 650
730 640
3 to 6 150 122
3 600 30
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