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Figure 28: DC Power Supply
NOTE: A 2000 W DC power supply requires a dedicated 60 A circuit breaker for each
input DC feed.
A 3000 W DC power supply requires a dedicated 100 A circuit breaker for each input
DC feed.
Each DC power supply connects to the backplane in an EX8208 switch and to the
midplane in an EX8216 switch. The backplane in an EX8208 switch and the midplane in
anEX8216switchdistributetheoutputpowerproducedbythepowersuppliestodifferent
switch components. Each DC power supply provides powerto all the components in the
switch.
The output of each 2000 W DC power supply is 52 VDC. The output power is 2000 W.
The output of each 3000 W DC power supply is 52 VDC. The output power is 3000 W.
A DC power supply works with only one input DC feed connected. It is able to deliver the
full output power to all chassis components with only one DC feed connected.
Each DC power supply has its own fan and is cooled by its own internal cooling system.
The airflow is from the front of the power supply to the back. Hot air exhausts from the
rear of the chassis.
The minimum power configuration required by an EX8200 switch is an N+1 power
configuration. In an N+1 power configuration, if one power supply fails or is removed, the
remaining power supplies continue to supply power for the system without interruption.
The configuration type of the switch and the input voltage determine the number of
power supplies needed (N) for a switch. You must install an additional power supply to
meet the required N+1 power redundancy configuration. The DC power supplies each
provideindependentAandBpowerfeeds,sothatdualpowerfeedredundancyisavailable
even in an N+1 configuration. See “EX8208 Switch Configurations” on page 6 for details
about different EX8208 switch configurations. See EX8216 Switch Configurations for
details about different EX8216 switch configurations.
49Copyright©2010,Juniper Networks,Inc.
Chapter2:ComponentDescriptions