Rack And Cabinet Requirements - Cisco Nexus 7706 Hardware Installation Manual

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Preparing the Site

• Full redundancy (n+1 and grid redundancy)—Add enough power supplies (reserve power supplies) to at least equal

the output of the active power supplies (number of power supplies calculated in Step 2). For power supply (n+1)

redundancy, ensure that you have at least one extra power supply. For input-source (grid) redundancy, you will

probably double the number of power supplies. You must plan for a second power source with at least the same

amount of input power for the reserve power supplies. For example, if you calculate that you need two 3-kW power

supplies for 6 kW of active power, then 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 active and reserve power). Either one of the reserve power supplies

can replace any of the active power supplies.

Step 4

Be sure that the power source circuits are dedicated to the switch and not to other electrical equipment.

For combined power mode (no power redundancy) or power supply (n+1) redundancy, you need only one dedicated

circuit. The requirements for each circuit are listed in the following table.

Table 2: Circuit Requirements for 3-kW Power Supplies

Power Supply

AC Power Supplies

3-kW power supply

DC Power Supplies

3-kW power supply

Step 5

Plan the placement of the input power receptacles within reach of the power cables used for each power supply (see the

following table for the maximum distances).

Typically, power receptacles are placed on the rack with the switch. If the DC power source is further than allowed by

the DC power cables, you can install a power interface unit (PIU) in the rack with the switch and connect that to the

power source with other cabling.

Power Supply

All AC power supplies

DC 3-kW power supplies