Juniper EX Series Complete Hardware Guide

Figure 22: Fan Tray Used in an EX 4200 Switch
Figure 23: Airflow Through the EX 4200 Switch Chassis
The fan tray used in an EX 4200 switch comes with load-sharing redundancy that
can tolerate a single fan failure at room temperature (below 45° C/113° F) to still
provide sufficient cooling.
Temperature sensors in the chassis monitor the temperature within the chassis. The
system raises an alarm if the fan fails or if the temperature inside the chassis rises
above permitted levels. If the temperature inside the chassis rises above the threshold,
the system shuts down automatically and the temperature shutdown LED on the
rear panel is lit. You can see the status of fans and the temperature from the
Environment Status menu on the LCD panel.
Related Topics ■ Field-Replaceable Units in EX-series Switches on page 99
■ EX 4200 Switch—Rear-Panel Description on page 12
■ Installing a Fan Tray in an EX-series Switch on page 110
Cooling System in an EX 4200 Switch ■ 33
Chapter 1: Switch Overview

Juniper EX Series Specifications

General

Series	EX Series
Category	Switch
Layer	Layer 2/3
Operating System	Junos OS
Managed	Yes
ACLs	Yes
Port Density	Varies by model
Power over Ethernet (PoE)	Available on some models
Virtual Chassis	Supported on some models
Form Factor	Fixed configuration, Modular
Switching Capacity	Varies by model
Forwarding Rate	Varies by model
Power Supply	Varies by model (AC or DC, redundant options available)
Management	CLI, Web UI, SNMP
Redundancy	Power supply, fan, Virtual Chassis
Latency	Varies by model
Jumbo Frames	Supported
VLAN Support	Yes
MAC Address Table Size	Varies by model
QoS	Yes
Energy Efficiency	EEE (802.3az)
Dimensions	Varies by model
Weight	Varies by model
Operating Temperature	0° to 45° C
Storage Temperature	-40° to 70° C
Humidity	5% to 90% non-condensing
MTBF	Varies by model
Warranty	Limited Lifetime