M320 Dc Power Supplies Description; Figure 22: Ac Power Supply - Juniper M320 Hardware Manual

M320 Multiservice Edge Router Hardware Guide
Related
Documentation

M320 DC Power Supplies Description

74
slots through
PEM0 PEM3
functional power supplies to operate.
To provide power redundancy, you can upgrade the number of AC power supplies from
two to three or from three to four. Each AC power supply provides power to all
components in the router.. Three AC power supplies provide full power redundancy. If
one power supply fails or is removed, the remaining power supplies instantly assume the
entire electrical load.
NOTE: In a router with two power supplies (no power supply redundancy),
if one power supply fails or is shut down, the other power supply goes into a
"check" state and does not operate even though it has not failed (this is
because the router requires two power supplies to operate).

Figure 22: AC Power Supply

M320 Power System Description on page 73
Connecting Power to an AC-Powered M320 Router on page 173
M320 AC Power Electrical Specifications on page 101
M320 AC Power Cord Specifications on page 102
In the DC power configuration, the router contains either two or four DC power supplies,
located at the lower rear of the chassis in slots
If only two DC power supplies are installed, the power supplies in either slots
or slots and
PEM1 PEM2 PEM3
DC power supply from two to four power supplies for full redundancy.
(top to bottom). The router requires a minimum of two fully
PEM0
can provide full power to the router. You can upgrade your
through (top to bottom).
PEM3
PEM0
Copyright © 2015, Juniper Networks, Inc.
and