Power Supplies - Juniper JUNOS OS 10.3 - SOFTWARE Manual

Power Supplies

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Copyright © 2010, Juniper Networks, Inc.
However, only the top fan tray cools the SF modules installed in the rear of the chassis.
See Cooling System and Airflow in an EX8216 Switch.
Power supplies for the EX8216 switch are fully redundant, load-sharing, and hot-insertable
and hot-removable field-replaceable units (FRUs). Each EX8216 switch chassis can hold
up to six 2000 W AC, six 3000 W AC, or six 3000 W DC power supplies.
The 2000 W AC power supplies support both low-voltage line (100–120 VAC) and
high-voltage line (200–240 VAC) AC power configurations on an EX8216 switch.
Each 3000 W AC power supply delivers 3000 W of power at high-voltage line (200–240
VAC) to the EX8216 chassis. Low-voltage line input is not supported for the 3000 W AC
power supplies on the EX8216 switch. Each DC power supply delivers 3000 W of power
to the chassis when the input voltage is in the range –40 VDC through –72 VDC.
The redundant AC configuration ships with six AC power supplies to provide the capacity
to power the system using N+1 or N+N power redundancy. The redundant DC configuration
ships with four DC power supplies. The dual inputs of the DC supplies provide direct
support for N+N power redundancy. The redundant configuration also provides sufficient
capacity for N+1 redundancy in most configurations; if necessary, up to two additional
DC supplies can be added to the system. See AC Power Supply in an EX8200 Switch,
DC Power Supply in an EX8200 Switch, and EX8216 Switch Configurations.
CAUTION: Mixing different types of power supplies in the same chassis is
not a supported configuration.
Field-Replaceable Units in an EX8216 Switch
Slot Numbering for an EX8216 Switch
Connecting and Configuring an EX Series Switch (CLI Procedure) on page 187
Connecting and Configuring an EX Series Switch (J-Web Procedure) on page 189
Chapter 2: Supported Hardware
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