NOTE: If the AC OK LED and the DC OK LED are unlit, either the AC power
cord is not installed properly or the power supply fuse has failed. If the AC
OK LED is lit and the DC OK LED is unlit, the AC power supply is not installed
properly or the power supply has an internal failure.
Related
Documentation
Power Supply in EX4200 Switches on page 33•
• Connecting AC Power to an EX4200 Switch on page 177
DC Power Supply LEDs in EX4200 Switches
The DC power supply is installed on the rear panel of the switch. Table 14 on page 38
describes the LEDs on the DC power supplies.
Table 14: DC Power Supply LEDs
DescriptionColorLED Label
Inputs A and B are normal, but there is no output.RedLED A
RedLED B
Inputs A and B are normal; output is normal.GreenLED A
GreenLED B
Input A has failed because the power supply fuse has failed,
input voltage is low, or there is a loose connection; output is
normal.
Flash RedLED A
GreenLED B
Input B has failed because the power supply fuse has failed,
input voltage is low, or there is a loose connection; output is
normal.
GreenLED A
Flash RedLED B
Both inputs have failed because the power supply fuse has
failed, input voltage is low, or there is a loose connection;
output is normal.
Flash RedLED A
Flash RedLED B
There is no input; there is no output.OffLED A
OffLED B
Related
Documentation
• Power Supply in EX4200 Switches on page 33
• Connecting DC Power to an EX4200 Switch on page 179
Copyright © 2015, Juniper Networks, Inc.38
EX4200 Switch Hardware Guide
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