Power Over Ethernet Ports; Ex4100 And Ex4100-F Cooling System; Ex4100 And Ex4100-F Power System - Juniper EX4100 Hardware Manual

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Power over Ethernet Ports

EX4100 and EX4100-F switches are available with or without Power over Ethernet (PoE) or Power over
Ethernet Plus (PoE+/PoE++) capability. Models that support PoE, PoE+, or PoE++ provide that support
on all of their RJ-45 downlink ports. The switch models provide perpetual and fast PoE functionality.
PoE, PoE+, and PoE++ ports provide electrical current to devices—such as IP phones, wireless access
points, and security cameras—through network cables. Because the network cables provide electrical
current, you do not need separate power cords for those devices.
1. The EX4100-24P and EX4100-48P switch models support PoE+ (30 W) by default.
2. The EX4100-F-24P and EX4100-F-48P switch models support PoE+ (30 W) by default.
3. The EX4100-24MP and EX4100-48MP switch models support PoE++ (90W) by default.
For more information about PoE support on EX series switches, see Understanding PoE on EX Series
Switches.
NOTE: IEEE 802.3at class 4 powered devices require category 5 or higher Ethernet cables.

EX4100 and EX4100-F Cooling System

The cooling system in EX4100 and EX4100-F switches consists of fan modules and built-in fans in the
power supplies. The airflow direction depends on the fan modules and power supplies installed in the
switch. You can order an EX4100 switch that supports front-to-back airflow or back-to-front airflow, as
follows:
• Front-to-back airflow: Air enters through the front of the switch.
• Back-to-front airflow: Air enters through the back of the switch.
The fan modules are hot-removable and hot-insertable field-replaceable units (FRUs) installed in the rear
panel of the switch. You can remove and replace the FRUs without powering off the switch or disrupting
switch functions.
EX4100-F-24P, EX4100-F-24T, EX4100-F-48P, and EX4100-F-48T switch models have built-in fans.

EX4100 and EX4100-F Power System

The following list presents the EX4100 and EX4100-F switch models with their compatible power
systems:
• EX4100-48P and EX4100-24P use the 920W AC AFO (Airflow Out) PSU (Power Supply Unit) FRUs.