Understanding Redundant Power Supplies; M5/M10 Router Redundant Power Supplies - Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Network Operation Manual

JUNOS Internet Software Network Operations Guide: Hardware

Understanding Redundant Power Supplies

Purpose
What Are Redundant
Power Supplies
Table 112: Router Power Supply Characteristics Per Routing Platform
Power Supply M5/
Characteristic M10
Number. of power 2
supplies
Watts per AC/DC 434 W
power supply
Supports both AC Yes
and DC power
supplies

M5/M10 Router Redundant Power Supplies

Figure 199: M5 and M10 Router Redundant Power Supplies
M5 and M10 router rear
Power supply A Power supply B
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Understanding Redundant Power Supplies
Inspect redundant power supplies to ensure that they distribute power to the other
router components according to their voltage requirements.
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.
M7i/
M10i M20 M40
2/4 2 2
AC 750 W 1500 W AC 2900 W
293 W DC
DC 293 W
Yes Yes Yes
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.
AC power supply
M40e M160 M320
2 2 4
DC original AC 1750 W
2600 W
DC 3000 W DC 2000 W
DC
enhanced
3200 W
Yes No; original Yes
or
enhanced
DC only
T320 T640
2 2
3200 W 6500W
DC DC
enhanced enhanced
3200 W 3200 W
No No
DC only DC only
DC power supply