Juniper Networks EX8208 - Manual (Page 74)

DC Power Supply in an EX8200 Switch
The DC power supplies in EX8200 switches are hot-removable and hot-insertable
field-replaceable units (FRUs).
NOTE: EX8208 switches support 2000 W DC power supplies.
EX8216 switches support 3000 W DC power supplies.
You can install up to six DC power supplies in an EX8200 switch. Power supplies are
installed at the bottom of the chassis in slots labeled PSU 0 through PSU 5 (left to right).
See “Slot Numbering for an EX8208 Switch” on page 13 and Slot Numbering for an
EX8216 Switch. All power supplies are accessible from the front of the chassis.
WARNING: The switch is pluggable type A equipment installed in a restricted-access
location. It has a separate protective earthing terminal provided on the chassis. This
separate protective earthing terminal must be permanently connected to earth ground.
NOTE: EX8216 switches have two protective earthing terminals provided on the chassis,
one on the left side of the chassis and the other on the rear of the chassis. Only one of
these protective earthing terminals needs to be permanently connected to earth ground.
See Chassis Physical Specifications of an EX8216 Switch for the location of the
protective earthing terminals.
NOTE: DC power supplies are shipped only in the redundant configuration of EX8200
switches.
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.
Each DC power supply weighs approximately 7 lb (3.2 kg) and has two independent pairs
of DC input lugs (A: –48V A: RTN and B: – 48V B: RTN ) on the front of the power supply.
Each power supply also has an
Enable switch, a fan, and four LEDs on the faceplate that
indicate the status of the power supply. See Figure 28 on page 49.
Copyright © 2010, Juniper Networks, Inc. 48
Complete Hardware Guide for EX8208 Ethernet Switches