Juniper QFabric QFX3000-G Hardware Documentation page 235

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Field-Replaceable Units in EX4200 Switches
Copyright © 2018, Juniper Networks, Inc.
PoE was first defined in the IEEE 802.3af standard. Starting with Junos OS Release 11.1,
EX4200 switches support enhanced PoE, a Juniper Networks extension to the IEEE
302.3af PoE standard that increases the amount of power per PoE port. A later standard,
IEEE 802.3at, defined PoE+. An IEEE 802.3af powered device operates normally when
connected to an IEEE 802.3at (PoE+) power sourcing equipment.
EX4200 switches with an AC power supply installed have options of full (all 24 or 48
ports) PoE/PoE+ capability or partial (8 ports) PoE capability. EX4200 switches with a
DC power supply installed do not provide PoE. For more information, see EX4200 Switch
Models.
Full PoE/PoE+ models are primarily used in IP telephony environments. Partial PoE
models are used in environments where, for example, only a few ports for wireless access
points or security cameras are required.
EX4200 Switch Models
Field-Replaceable Units in EX4200 Switches on page 185
Site Preparation Checklist for EX4200 Switches on page 216
Understanding PoE on EX Series Switches
Field-replaceable units (FRUs) are components that you can replace at your site. The
FRUs in the switch are:
Power supply
Fan tray
Uplink module
Transceivers
NOTE: Uplink modules are not part of the standard package and must be
ordered separately.
The fan tray, uplink module, and transceivers are hot-removable and hot-insertable: You
can remove and replace them without powering off the switch or disrupting switch
functions.
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/support/tools/updateinstallbase/
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.
Chapter 8: EX4200 Overview
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