JUNOS Internet Software Network Operations Guide: Hardware
508 ! Understanding Redundant Power Supplies
Understanding Redundant Power Supplies
Purpose Inspect redundant power supplies to ensure that they distribute power to the other
router components according to their voltage requirements.
What Are Redundant
Power Supplies
With redundant power supplies, two power supplies are installed in a router and
perform load sharing during normal operation. When one power supply fails or is
switched off, the other power supply immediately and automatically assumes the
entire electrical load. Table 112 lists some router characteristics for each M-series
router platform type.
The power supplies are internally connected to the midplane, which delivers the
power input from the circuit breaker box and distributes the different output
voltages produced by the power supplies to the router’s components, depending on
their voltage requirements.
Table 112: Router Power Supply Characteristics Per Routing Platform
M5/M10 Router Redundant Power Supplies
Two load-sharing, isolated power supplies are located at the bottom rear of the M5
and M10 router chassis. The routers use either AC or DC power. Figure 199 shows
the M5 and M10 router power supplies and where they are installed in the chassis.
Figure 199: M5 and M10 Router Redundant Power Supplies
Power Supply
Characteristic
M5/
M10
M7i/
M10i
M20 M40 M40e M160 M320 T320 T640
Number. of power
supplies
22/4 22 2 2 4 2 2
Watts per AC/DC
power supply
434 W AC
293 W DC
DC 293 W
750 W 1500 W AC 2900 W
DC 3000 W
DC original
2600 W
DC
enhanced
3200 W
AC 1750 W
DC 2000 W
3200 W
DC
enhanced
3200 W
6500W
DC
enhanced
3200 W
Supports both AC
and DC power
supplies
Yes Yes Yes Yes Yes No; original
or
enhanced
DC only
Yes No
DC only
No
DC only
AC power supplyM5 and M10 router rear DC power supply
Power supply BPower supply A
1694
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