Juniper Networks EX4200 - Manual (Page 56)

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 Topics Power Supply in EX3200 and EX4200 Switches on page 26 ■
■ Connecting AC Power to an EX3200 or EX4200 Switch on page 146
DC Power Supply LEDs in EX3200 and EX4200 Switches
The DC power supply in an EX3200 or EX4200 switch is on the rear panel. Table 14
on page 30 describes the LEDs on the DC power supplies in EX3200 and EX4200
switches.
Table 14: DC Power Supply LEDs in EX3200 and EX4200 Switches
Description Color LED Label
Inputs A and B are normal, but there is no output. Red LED A
Red LED B
Inputs A and B are normal; output is normal. Green LED A
Green LED 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 Red LED A
Green LED 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. Green LED A
Flash Red LED 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 Red LED A
Flash Red LED B
There is no input; there is no output. Off LED A
Off LED B
Related Topics Power Supply in EX3200 and EX4200 Switches on page 26 ■
■ Connecting DC Power to an EX3200 or EX4200 Switch on page 148
30 ■ DC Power Supply LEDs in EX3200 and EX4200 Switches
Complete Hardware Guide for EX3200 and EX4200 Ethernet Switches