M120 Dc Power Supply Description; M120 Ac Power Supply Description; Figure 20: M120 Dc Power Supply - Juniper M120 Hardware Manual

M120 Multiservice Edge Router Hardware Guide

M120 DC Power Supply Description

Related
Documentation

M120 AC Power Supply Description

72
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
(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

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
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
(left to right). Each AC power supply provides power to all components in the router.
PEM1
and
PEM0 PEM1
through
PEM0
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