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Planning for Power Requirements
Step 4
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 that are calculated for the
available power in Step 2. This power mode does not provide power redundancy, so no extra power supplies are
needed.
• n+1 redundancy—Add one power supply (reserve power supply) that can output as much power as the most powerful
power supply that is used for active power. This form of power redundancy provides a reserve power supply that
can replace any active power supply that goes offline.
• n+n redundancy—Add enough power supplies (reserve power supplies) to at least equal the total output of the active
power supplies (the number of power supplies that are calculated in Step 2). Typically, you double the number of
power supplies. 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).
Step 5
Be sure that the power source circuits are dedicated to the switch and not to other electrical equipment.
For combined mode or n+1 redundancy mode, you need only one dedicated circuit. For n+n redundancy, you must have
two dedicated power circuits, with each circuit powering half of the 3-kW power supplies. The requirements for each
circuit are listed in the following table.
Power Supply
3-kW AC power supply (N9K-PAC-3000W-B)
3-kW Universal AC/DC power supply
(N9K-PUV-3000W-B and N9K-PUV2-3000W-B)
3-kW DC power supply (N9K-PDC-3000W-B)
Step 6
Plan the placement of the input power receptacles within reach of the power cables that are used for each power supply,
see the following table for the maximum distances.
Typically, power receptacles are placed on the rack with the switch.
Power Supply
3-kW AC power supplies
3-kW Universal AC/DC power supplies
3-kW DC power supplies
Cisco Nexus 9516 NX-OS Mode Switch Hardware Installation Guide
12
Number of Circuits
1 (combined mode or n+1 redundancy
mode)
2 (n+n redundancy mode)
1 (combined mode or n+1 redundancy
mode)
2 (n+n redundancy mode)
1 (combined mode or n+1 redundancy
mode)
2 (n+n redundancy mode)
Maximum Distance Between Receptacle and Power Supply
8 to 12 feet (2.5 to 3.5 m)
14 feet (4.27 m)
You provide four 6-gauge wires (recommended) and cuts that wire to
the required length. We provide four 6-gauge lugs to connect those
wires to the DC power supply.
Preparing the Site
Requirement for Each
Circuit
16 A at 200 to 240 VAC
AC power: 200 to 277 VAC
DC power: 240 to 380 VDC
45A at -40 to -75 VDC
(-48 VDC nominal US)
(-60 VDC nominal
international)
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