Dc Power Supply Load Sharing And Fault Tolerance; M320 Power Supply Leds; Table 51: Power Supply Led - Juniper M320 Hardware Manual

M320 Multiservice Edge Router Hardware Guide

DC Power Supply Load Sharing and Fault Tolerance

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Documentation

M320 Power Supply LEDs

Table 51: Power Supply LED

Label Color
Blue
OUTPUT OK
76
When the router is fully configured with four DC power supplies:
The DC power supplies provide full redundancy
The DC power supply in
.
PEM0
DC power supply in
PEM3
Load sharing occurs between the DC power supplies installed in slots
Load sharing occurs between the DC power supplies in slots
NOTE: Isolated DC power supplies share current over the full input operating
voltage range. The current sharing between nonisolated power supplies relies
on equal voltages at the power supply input terminals.
M320 Power System Description on page 73
Connecting Power to a DC-Powered M320 Router on page 174
Maintaining the M320 Power Supplies on page 278
Replacing an M320 DC Power Supply on page 250
M320 DC Power Electrical Specifications on page 105
The LED on each power supply faceplate indicates the status of the power
OUTPUT OK
supply (see Table 51 on page 76
power supply status is also reflected in two LEDs on the craft interface (see
Interface Power Supply LEDs" on page
the red alarm LED on the craft interface.
State Description
Off No power applied to power supply.
Blinking Power supply blinks for 5 seconds after initial power on.
Power supply is installed, but not powered on, and is receiving bias power from
a powered on power supply.
Input voltage is invalid.
Power supply has failed.
On steadily Power supply is functioning normally.
serves as the backup to the DC power supply in slot
PEM2
serves as the backup to the DC power supply in slot
, which applies to the AC and DC power supply). The
19). In addition, a power supply failure triggers
PEM1
and
PEM0
PEM1 and PEM3
"M320 Craft
Copyright © 2015, Juniper Networks, Inc.
PEM2