Understanding Power Supplies ! 227
Chapter 18: Monitoring Power Supplies
M320 Router Power Supplies
The M320 router uses either AC or DC power. Figure 92 shows the M320 router
power supplies and where they are installed in the chassis.
Figure 92: M320 Router Power Supplies
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.
A
M
A
S
T
E
R
F
A
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L
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K
A
B
B
M
A
S
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E
R
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A
C
TIV
E
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I
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A
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TIV
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FA
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A
C
TIV
E
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A
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Power supply
PEM0
M320 router rear
AC power supply
DC power supply
Power supply
PEM1
Power supply
PEM2
Power supply
PEM3
g002105
C
B
0
R
E
0
R
E
1
C
B
1
S
IB
0
S
IB
1
S
IB
2
S
IB
3
CB-M
CB-M
S
IB
-M
S
IB
-M
S
IB
-M
S
IB
-M
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
PEM2 and PEM3 must be powered by dedicated power feeds derived from feed B.
This configuration provides the commonly deployed
A/B feed redundancy for the
system.
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