Power System Components And Descriptions; M120 Power Supplies Description - Juniper M120 Hardware Manual

CHAPTER 7
Power System Components and
Descriptions

M120 Power Supplies Description

Related
Documentation
Copyright © 2018, Juniper Networks, Inc.
M120 Power Supplies Description on page 71
M120 DC Power Supply Description on page 72
M120 AC Power Supply Description on page 72
M120 Power Supply LEDs on page 73
The M120 router is configurable with either one or two AC or DC power supplies. The
power supplies connect to the midplane, which distributes the different output voltages
produced by the power supplies to the router components, depending on their voltage
requirements.
All power supplies are hot-removable and hot-insertable.
NOTE: To maintain proper cooling and prevent thermal shutdown of the
operating power supply unit, each power supply slot must contain either a
power supply or a blank panel. If you remove a power supply, you must install
a replacement power supply or a blank panel shortly after the removal.
CAUTION: Mixing AC and DC power supplies is not supported. The first power
supply powered on will electrically disable the second power supply without
damaging any components in the system.
M120 AC Power Supply Description on page 72
M120 DC Power Supply Description on page 72
Connecting Power to an AC-Powered M120 Router on page 167
Connecting Power to a DC-Powered M120 Router on page 169
Maintaining the M120 Power Supplies on page 277
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