Lenovo RackSwitch G8332 Installation Manual page 27

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Two power supply modules are required for redundancy. Each power supply can be
connected to a separate circuit to mitigate the risk of down-time during a localized
power failure. When used in a redundant configuration, the dual power supplies
have a load-sharing capability that enables each power supply to operate at
approximately 50 percent of full load.
Using redundant power can minimize the power disruption during a power supply
failure and extend the expected lifetime of each power supply by operating normally
in a conservative power mode.
For proper airflow when operating the switch with only one power supply module,
the empty power supply bay must be protected by a blank cover module.
There is no power switch on the G8332 power modules; the switch powers up when
power is supplied through the power cord to one or both power supplies.
Power LEDs
On the front of the switch, the Power LED on the management panel indicates the
general status of the power supplies. The LED flashes when only one power cord is
connected, and is steady when both power cords are connected (see
Status LEDs" on page 22).
Additional LED indicators are located on the rear panel of the switch, on the
individual power supply modules. The following table describes the power supply
module LED behavior.
Table 7. Power supply module status LED behavior
LED State
Service ( ! ) Amber
Off
DC Green
Off
AC Green
Off
Functional Meaning
Power supply failure.
Power supply is operational.
DC output power is present.
DC output power is OK.
AC power is OK.
No power. Output is disabled, or input
power is outside operating range.
"System
Chapter 2: Switch Components
27