Cisco Nexus 9508 Hardware Installation Manual page 18

Planning for Power Requirements
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 within 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).
Table 1: Power Requirements for the Cisco Nexus 9508 Switch Modules
Component
Supervisor Modules
– Supervisor (N9K-SUP-A)
System Controller Modules
– System Controller (N9K-SC-A)
I/O Modules
– 48-port 1-/10-Gigabit BASE-T plus 4-port QSFP+ I/O module
(N9K-X9564TX)
– 48-port 1-/10-Gigabit SFP+ plus 4-port QSFP+ I/O module (N9K-X9564PX)
– 36-port 40-Gigabit QSFP+ aggregation I/O module (N9K-X9636PQ)
Fabric Modules (N9K-C9508-FM)
Fan Trays (N9K-C9508-FAN)
To determine the maximum amount of power that can be consumed by this switch when fully loaded with components,
add the maximum power consumed by two supervisors (2 x 80 W = 160 W), two system controllers (2 x 25 W = 50 W),
eight 48-port 1- and 10-Gigabit BASE-T I/O modules (8 x 550 W = 4400 W), six fabric modules (6 x 250 W = 1500
W), and three fan trays (3 x 250 W = 750 W). The total is 6860 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 3-kW power supplies, round up a fractional result to the nearest ones digit to determine the number of power supplies
needed.
For example, if you are installing a switch with 3-kW power supplies and have a maximum consumption of 6960 W,
you need three power supplies (6960 W / 3000 W = 2.32 [rounded up to 3 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:
Cisco Nexus 9508 Switch Site Preparation and Hardware Installation Guide
8
Preparing the Site
Quantity Maximum Typical
1 or 2 — —
80 W 69 W
2 — —
25 W 13 W
1 to 8 (can — —
mix types)
550 W 450 W
430 W 300 W
400 W 260 W
3 or 6 250 W 176 W
3 250 W 176 W
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