Juniper EX Series Complete Hardware Guide

■ Removing a Fan Tray from an EX-series Switch on page 112
■ Preventing Electrostatic Discharge Damage on page 138
DC Power Supply LEDs in EX 3200 and EX 4200 Switches
The DC power supply in an EX 3200 or EX 4200 switch is a hot-removable and
hot-insertable field-replaceable unit (FRU) located on the rear panel. Table 19 on page
32 describes the LEDs on the DC power supplies in EX 3200 and EX 4200 switches.
Table 19: DC Power Supply LEDs in EX 3200 and EX 4200 Switches
DescriptionColorLED Label
Inputs A and B are normal, but there is no output.RedLED A
RedLED B
Inputs A and B are normal; output is normal.GreenLED A
GreenLED B
Input A has failed because the power supply fuse has failed,
input voltage is low, or there is a loose connection; output is
normal.
Flash RedLED A
GreenLED B
Input B has failed because the power supply fuse has failed,
input voltage is low, or there is a loose connection; output is
normal.
GreenLED A
Flash RedLED B
Both inputs have failed because the power supply fuse has
failed, input voltage is low, or there is a loose connection;
output is normal.
Flash RedLED A
Flash RedLED B
There is no input; there is no output.OffLED A
OffLED B
Related Topics Power Supply in EX 3200 and EX 4200 Switches on page 27■
■ Connecting AC Power to an EX 3200 or EX 4200 Switch on page 79
■ Connecting DC Power to an EX 3200 or EX 4200 Switch on page 81
Cooling System in an EX 4200 Switch
The cooling system in an EX 4200 switch consists of a field-replaceable unit (FRU)
fan tray with three fans (see Figure 22 on page 33). The fan tray is located at the
rear of the chassis and provides side-to-rear chassis cooling (see Figure 23 on page 33).
32 ■ DC Power Supply LEDs in EX 3200 and EX 4200 Switches
Complete Hardware Guide for EX 3200 and EX 4200 Switches

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