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Planning for Power Requirements
• Power mode to use and the number of extra power supplies required for that mode.
Ensure that the circuit that is used for the switch is dedicated to the switch to minimize the possibility of circuit
failure. Also, ensure that the switch uses either AC or DC power sources, not a mix of AC and DC power
sources.
Calculate the power that is required for operations (available power) and redundancy (reserve power), then
you can plan for the required number of input power receptacles. The power receptacles will be within reach
of the switch location.
Step 1
Determine the power requirement for the modules in the switch by summing the maximum wattage for each installed
module, see the following table.
Component
Supervisor modules
–
Supervisor A (N9K-SUP-A)
–
Supervisor A+ (N9K-SUP-A+)
–
Supervisor B (N9K-SUP-B)
–
Supervisor B+ (N9K-SUP-B+)
System Controller Module
– System Controller (N9K-SC-A)
Line cards that are supported by N9K-C9516-FM fabric modules
–
36-port 40-Gigabit QSFP+ line card (N9K-X9736PQ)
Line cards that are supported by N9K-C9516-FM-E2 fabric modules
–
32-port 100-Gigabit Ethernet QSFP28 line card (N9K-X9732C-EX)
–
36-port 100-Gigabit Ethernet QSFP28 line card (N9K-X9736C-FX)
–
36-port 40-Gigabit Ethernet QSFP28 line card (N9K-X9736Q-FX)
Fan Trays (N9K-C9516-FAN)
For example, to determine the maximum amount of power that your fully loaded switch consumes, add the maximum
power consumption of two supervisor A modules (2 x 80 W = 160 W), two system controllers (2 x 25 W = 50 W), 10
36-port 40-Gigabit line cards (10 x 211 W = 2110 W), six fabric modules (6 x 504 W = 3024 W), and three fan trays (3
x 451 W = 1353 W). The total is 6697 W.
Step 2
Determine the number of power supplies required to power the modules that are installed in the switch by dividing the
module power requirement amount (see Step 1) by the output wattage (3000 W) of the power supplies installed in the
switch. Round up the fractional result to the nearest ones digit.
For example, if you are installing a switch with maximum consumption of 6694 W, you need three power supplies (6694
W / 3000 W = 2.23 [rounded up to three power supplies]) to operate the switch and its modules.
Cisco Nexus 9516 ACI-Mode Switch Hardware Installation Guide
10
Preparing the Site
Typical
Maximum
—
—
69 W
80 W
69 W
80 W
75 W
90 W
75 W
80 W
—
—
14 W
25 W
330 W
504 W
211 W
197 W
439 W
900 W
430 W
720 W
607 W
720 W
571 W
684 W
330 W
600 W
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