CHAPTER 4
Power Supplies
•
AC Power Supply in an EX9208 Switch on page 43
•
AC Power Supply LEDs in an EX9208 Switch on page 45
•
DC Power Supply in an EX9208 Switch on page 46
•
DC Power Supply LEDs in an EX9208 Switch on page 48
AC Power Supply in an EX9208 Switch
An EX9208 switch is configurable with two, three, or four AC power supplies. The power
supplies connect to the midplane, which distributesthe different output voltages produced
by the power supplies to the switch components, depending on their voltage requirements.
Each power supply is cooled by its own internal cooling system.
CAUTION: EX9208 switches use either AC or DC power supplies. Do not mix
AC and DC powersupplies in a switch. The firsttype of power supplydetected
by the switch when initially powered on determines the type of power supply
allowed by the switch. All installed power supplies of the other type are
disabled by the switch. If you install a power supply of the other type while
the switch is operating, the switch disables the power supply and generates
an alarm.
This topic describes the AC power supplies in EX9208 switches:
•
AC Power Supply Description on page 43
•
AC Power Supply Configurations on page 44
AC Power Supply Description
The AC power supplies in EX9208 switches are hot-insertable and hot-removable
field-replaceable units (FRUs).
You can install up to four AC power supplies in an EX9208 switch. Power supplies are
installed in the rear of the chassis in slots PEM0 through PEM3 (left to right).
43Copyright © 2017, Juniper Networks, Inc.
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