M320 Dc Power Supply; Figure 17: Ac Power Supply - Juniper M320 Hardware Manual

M320 Router Hardware Guide
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M320 DC Power Supply

34
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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).
For AC power supply and power system electrical specifications, see "M320 AC Power
Electrical Specifications" on page 252 and "M320 AC Power Cord Specifications" on
page 253.

Figure 17: AC Power Supply

Connecting Power to an AC-Powered M320 Router on page 96
Grounding the M320 Router on page 95
M320 AC Power Electrical Specifications on page 252
M320 Power System Description on page 33
In the DC power configuration, the router contains either two or four DC power supplies
(see Figure 18 on page 35), located at the lower rear of the chassis in slots
PEM3 (top to bottom). You can upgrade your DC power supply from two to four power
supplies. The DC power supplies in slots
load-sharing and power to the FPCs in slots
in slots and , when both are installed, provide load-sharing and power to the
PEM1 PEM3
FPCs in slots through
FPC0
provide power to the fan trays.
When fully configured with four DC power supplies, the DC power supplies provide full
redundancy. The DC power supplies in slots
the router. Likewise, the DC power supplies in slots
power. The DC power supply in
slot , and the DC power supply in
PEM0
supply in slot .
PEM1
PEM0 and PEM2
FPC3 through
, SIBs, CBs, and Routing Engines. All DC power supplies
FPC2
and
PEM0
PEM2
serves as the backup to the DC power supply in
PEM2
serves as the backup to the DC power
PEM3
PEM0 through
, when both are installed, provide
FPC7 . The DC power supplies
can provide full power to
PEM1
and can also provide full
PEM3
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