Power Supply LEDs
AC Power Supply works when the AC input voltage is greater than 85 V. For normal operation, the INPUT
LED on AC Power Supply should be solid green. If the INPUT LED on AC Power Supply is blinking green
or off, check the AC power supply status. For more information, refer Troubleshooting an AC-Input Power
Supply, on page 132
DC power supply works when DC input voltage is greater than 40 V. For normal operation, the INPUT LED
on DC Power Supply should be solid green. If the INPUT LED on DC Power Supply is blinking green or off,
check the DC power supply status. For more information, refer Troubleshooting a DC-Input Power Supply,
on page 133
Note
Table 24: Cisco Catalyst 9400 Series Power Supply LEDs
MeaningLED ColourLED type
AC input voltage is 70 V minimum.
DC input voltage is -40 V minimum.
Green
INPUT
AC input voltage is less than 70 V.
DC input voltage is less than -40 V.
Off
AC input voltage is between 70 V and 85 V.
DC input voltage is between -37 V and -41 V.
Blinking Green
55 VDC power supply output and power supply
modules are operating within regulation limits.
Green
OUTPUT
Standby mode or sleep mode.
Blinks on for 0.5 seconds and off for 0.5 seconds.
Blinking Green
DC output voltages have not exceeded the alarm
threshold ranges.
Off
FAIL
An output voltage is out of the specified range, or the
power supply module's fan has failed (as sensed by
lack of fan rotation), or the power supply module is
turned off after input power is applied.
Illuminates for 2-3 seconds after input is applied or
disconnected through the front panel On/ Off rocker
switch (for AC-input power supplies) or On/ Off
power button (for DC-input power supplies) or a
circuit breaker.
Red
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
162
LEDs
Power Supply LEDs
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