M320 Router Redundant Power Supplies - Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Network Operation Manual

JUNOS Internet Software Network Operations Guide: Hardware

M320 Router Redundant Power Supplies

Figure 206: M320 Router Redundant Power Supplies
M320 router rear
Power supply
PEM0
Power supply
PEM1
Power supply
PEM2
Power supply
PEM3
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Understanding Redundant Power Supplies
The M320 router uses either AC or DC power. Figure 206 shows the M320 router
power supplies and where they are installed in the chassis.
The M320 router supports four power supplies. The AC power supplies are fully
redundant. If one power supply fails or is removed, the remaining power supplies
instantly assume the entire electrical load. Three power supplies can provide full
power for as long as the router is operational.
In the M320 router DC power supply configuration, the router has four DC power
supplies, located at the lower rear of the chassis in slots PEM0 through PEM3 (top to
bottom). The DC power supplies in slots PEM0 and PEM2 are load-sharing and
provide power to the Flexible PIC Concentrators (FPCs) in slots FPC3 through FPC7 .
The DC power supplies in slots PEM1 and PEM3 are load-sharing and provide power
to the FPCs in slots FPC0 through FPC2 , Switch Interface Boards (SIBs), Control
Boards, and Routing Engines. All DC power supplies provide power to the fan trays.
NOTE: The DC power supplies in slots PEM0 and PEM1 must be powered by
dedicated power feeds derived from feed A, and the DC power supplies in slots
and PEM3 must be powered by dedicated power feeds derived from feed B.
PEM2
This configuration provides the commonly deployed A/B feed redundancy for the
system.
AC power supply
DC power supply