Cisco Nexus 7702 Hardware Installation Manual page 79

Installing or Replacing Modules, Fan Trays, and Power Supplies
of the power supplies to one AC power source or you connect half of the power supplies to one AC power
source and the other half to another AC power source:
• For combined power mode (no power redundancy), you need enough power supplies to power all switch
• For power supply redundancy mode (n+1 redundancy mode), you need enough power supplies to power
• For input source redundancy (grid redundancy) mode or full redundancy mode, you need twice the
Before You Begin
Before you connect power supplies to one or two power sources, ensure all of the following:
• You have receptacles for one or two AC power sources within reach of the power supply cables. The
• The AC power sources are rated as follows:
• The power supply is already installed in the chassis.
• The chassis is connected to an earth ground.
Step 1 Ensure that the power supply switch located on the front of the power supply is set at standby (labeled as 0).
Step 2 Plug the AC power cable into the power supply. The built-in latch secures the power cable to the power supply. You can
disconnect the power cable from the power supply by pressing the release button on the power cable.
Step 3 Plug or connect the other end of the power cable into a AC power source supplied by the data center.
Note If you are using the combined power mode or power supply redundancy, you connect the power cables to the
same 20-A circuit. If you are using the input source redundancy mode or full redundancy mode, you connect
half of the power cables to one AC power source and the other half to another AC power source.
Warning Take care when connecting units to the supply circuit so that wiring is not overloaded.
operations and connect all of the power supplies to the same AC power source. You can install the power
supplies in any open power supply slot in the chassis.
all switch operations and one extra power supply that can replace a failing power supply. You connect
all power supplies to the same AC power source. You can install the power supplies in any open power
supply slot in the chassis.
number of power supplies needed to power the switch operations. You connect half of the power supplies
to one power source for active power and the other half to another power source for redundant power.
You must ensure that the power supplies on the left side of the chassis are connected to one grid and
that the power supplies on the right side of the chassis are connected to the other grid.
number of power sources depends on the power mode to be used for the switch.
◦Combined power (no power redundancy)—One AC power source
◦Power supply redundancy (n+1 redundancy)—One AC power source
◦Input source redundancy (power-grid redundancy)—Two AC power sources
◦Full redundancy—Two AC power sources
◦For North American installations—20A with 110V or 220V circuits.
◦For international installations—size the circuits by local and national standards.
Connecting a 3.5-kW HVAC/HVDC Power Supply to AC Power Sources
Cisco Nexus 7702 Hardware Installation Guide
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