M120 DC Power Supply Description
In the DC power configuration, the router contains two DC power supplies (see
Figure 20 on page 72), located in the right rear of the chassis in slots PEM0 and PEM1
(left to right). A single DC power supply provides sufficient power for a fully configured
router.
Two DC power supplies share power almost equally within a fully populated system. If
either power supply fails, the remaining power supply takes over without interruption.
Each DC power supply has a single DC input (–48 VDC and return) that requires a
dedicated 60 A (–48 VDC) circuit breaker for the maximum router hardware configuration.
.
Figure 20: M120 DC Power Supply
Related
Documentation
M120 Power Supply LEDs on page 73•
• M120 Router Power Requirements on page 88
• Connecting Power to a DC-Powered M120 Router on page 169
• Maintaining the M120 Power Supplies on page 277
• Replacing an M120 DC Power Supply on page 245
• M120 DC Power, Connection, and Cable Specifications on page 97
M120 AC Power Supply Description
In the AC power configuration, the router contains two AC power supplies (see
Figure 21 on page 73), located vertically at the rear of the chassis in slots PEM0 through
PEM1 (left to right). Each AC power supply provides power to all components in the router.
Copyright © 2018, Juniper Networks, Inc.72
M120 Multiservice Edge Router Hardware Guide
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