Four power supplies provide full redundancy. If a DC power supply in a redundant
configuration is removed or fails, its redundant power supply takes over without
interruption. The DC power supply in PEM2 serves as redundant to the DC power supply
in slot PEM0, and the DC power supply in PEM3 serves as redundant to the DC power
supply in slot PEM1. If only two DC power supplies are installed, they must be installed
in slots PEM0 and PEM1 or in slots PEM2 and PEM3.
Table 21 on page 48 shows the components that are powered by each DC power supply
slot. It applies to existing and high-capacity power supplies.
Table 21: Power Supply Redundancy and Power Distribution
Components That Are Supplied Power
DC Power Supply
Slot
Fan tray, line card slots 0 and 1, and SF slots 0 and 1PEM0
Fan tray and line card slots 2 through 5PEM1
Fan tray, line card slots 0 and 1, and SF slots 0 and 1PEM2
Fan tray and line card slots 2 through 5PEM3
Related
Documentation
DC Power Supply Specifications for EX9208 Switches on page 96•
• DC Power Supply LEDs in an EX9208 Switch on page 48
• Power Requirements for EX9200 Switch Components on page 91
• Installing a DC Power Supply in an EX9208 Switch on page 218
• Removing a DC Power Supply from an EX9208 Switch on page 220
DC Power Supply LEDs in an EX9208 Switch
A DC power supply has three LEDs on its faceplate: POWER OK, BRKR ON, and INPUT OK
LEDs. The power supply status is also reflected in two LEDs on the craft interface. In
addition, a power supply failure triggers the major alarm LED on the craft interface.
NOTE: A host subsystem must be present for the POWER OK LED to be on.
Table 22 on page 49 describes the LEDs on a DC power supply in EX9208 switches.
Copyright © 2017, Juniper Networks, Inc.48
EX9208 Switch Hardware Guide
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