Juniper M120 - DC Power Requirements and Specifications; M120 DC Power, Connection, and Cable Specifications

CHAPTER 7
Power System Components and
Descriptions
•
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
M120 Power Supplies Description
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: MixingACandDC 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.
Related
Documentation
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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