Juniper JUNOS - NETWORK OPERATION GUIDE REV1 User Manual

JUNOS Internet Software Network Operations Guide: Hardware
220 ! Understanding Power Supplies
When the power supplies are installed and operational, they automatically share the
electrical load. If a power supply stops functioning for any reason, the remaining
power supply instantly begins providing all the power the router needs for normal
functioning and can provide full power indefinitely.
M7i Router Power Supplies
Two load-sharing, isolated power supplies are located at the bottom rear of the M7i
router chassis. The router uses either AC or DC power. Figure 86 shows the M7i
router power supplies and where they are installed in the chassis.
When the power supplies are installed and operational, they automatically share the
electrical load.
For full redundancy, two power supplies are required. If a power supply stops
functioning for any reason, the second power supply instantly begins providing all
the power the router needs for normal functioning. The second power supply can
provide full power indefinitely.
Figure 86: M7i Router Power Supplies
NOTE: Mixing AC and DC power supplies is not supported. The two power supplies
must be either both AC or both DC.
When two power supplies are installed, at least one Routing Engine and one FPC
must also be installed for both power supplies to power on. In the absence of this
minimum load, only one power supply starts. (The router powers on and operates
correctly with one power supply, but without the redundancy benefit of having a
second power supply installed.)
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NOTE: When two power supplies are installed, at least one Routing Engine and one
FPC must also be installed for both power supplies to power on. In the absence of
this minimum load, only one power supply starts. (The router powers on and
operates correctly with one power supply, but without the redundancy benefit of
having a second power supply installed.)

Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Specifications

General

Brand	Juniper
Model	JUNOS - NETWORK OPERATION GUIDE REV1
Category	Software
Language	English