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M120 Power Supply LEDs
Copyright © 2018, Juniper Networks, Inc.
When two power supplies are present, they share power almost equally within a fully
populated system.
Two AC power supplies provide full power redundancy. If one power supply fails or is
removed, the remaining power supply instantly assumes the entire electrical load without
interruption. One power supply provides the maximum configuration with full power for
as long as the router is operational.
Each AC power supply has two AC appliance inlets. Each requires a dedicated AC power
feed. For 100-120 VAC, both inlets are used and the bottom inlet cover must be removed
prior to installation. For 200-240 VAC, only the top inlet is used.
Figure 21: M120 AC Power Supply
M120 Power Supply LEDs on page 73
M120 Router Power Requirements on page 88
Connecting Power to an AC-Powered M120 Router on page 167
Maintaining the M120 Power Supplies on page 277
Replacing an M120 AC Power Supply on page 239
M120 AC Power, Connection, and Power Cord Specifications on page 93
The LED on each power supply faceplate indicates the status of the power supply (see
Table 44 on page
74, which applies to the AC and DC power supply). The power supply
status is also reflected in two LEDs on the craft interface (see
the M120 Craft Interface" on page
alarm LED on the craft interface.
Chapter 7: Power System Components and Descriptions
15). In addition, a power supply failure triggers the red
"Power Supply LEDs on
73
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