Functionality; Power Supply - Juniper EX4600 Series Hardware Manual

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Understanding Redundancy of EX4600 Switch Components and Functionality
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Documentation
Copyright © 2014, Juniper Networks, Inc.
NOTE: If you have a Juniper J-Care service contract, register any addition,
change, or upgrade of hardware components at
https://www.juniper.net/customers/csc/management/updateinstallbase.jsp
Failure to do so can result in significant delays if you need replacement parts.
This note does not apply if you replace existing components with the same
type of component.
Installing and Removing EX4600 Switch Hardware Components on page 167
The following hardware components provide redundancy on a EX4600 switch:
Power supplies—The EX4600 switch has one or two power supplies. Each power
supply provides power to all components in the switch. If two power supplies are
installed, the two power supplies provide full power redundancy to the device. If one
power supply fails or is removed, the second power supply balances the electrical load
without interruption.
To provide power redundancy to the system both power supplies must be installed.
Connect power source feed A to one power supply and power source feed B to the
second power supply.
CAUTION: Do not connect feed A and feed B to the same power supply
input terminal.
Cooling system—The EX4600-40F switch has five fan modules. If a fan module fails
and is unable to keep the EX4600 switch within the desired temperature thresholds,
chassis alarms occur and the EX4600 switch can shut down.
AC Power Supply in an EX4600 Switch on page 23
DC Power Supply in an EX4600 Switch on page 25
Cooling System and Airflow in an EX4600 Switch on page 13
Chapter 1: EX4600 Overview
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