Juniper EX3300 Series User Manual

WARNING: It is particularly important to provide a properly grounded and
shielded environment and to use electrical surge-suppression devices.
Table 20: Site Electrical Wiring Guidelines
GuidelinesSite Wiring Factor
If your site experiences any of the following problems, consult experts in electrical surge
suppression and shielding:
•
Improperly installed wires cause radio frequency interference (RFI).
•
Damage from lightning strikes occurs when wires exceed recommended distances or pass
between buildings.
•
Electromagnetic pulses (EMPs) caused by lightning damages unshielded conductors and
electronic devices.
Signaling limitations
To reduce or eliminate radio frequency interference (RFI) from your site wiring, do the following:
•
Use twisted-pair cable with a good distribution of grounding conductors.
•
If you must exceed the recommended distances, use a high-quality twisted-pair cable with
one ground conductor for each data signal when applicable.
Radio frequency
interference
If your site is susceptible to problems with electromagnetic compatibility (EMC), particularly from
lightning or radio transmitters, seek expert advice.
Some of the problems caused by strong sources of electromagnetic interference (EMI) are:
•
Destruction of the signal drivers and receivers in the switch
•
Electrical hazards as a result of power surges conducted over the lines into the equipment
Electromagnetic
compatibility
Related
Documentation
General Safety Guidelines and Warnings on page 133•
• General Electrical Safety Guidelines and Warnings on page 157
• Prevention of Electrostatic Discharge Damage on page 158
• Power Supply in EX2200 Switches
• Power Supply in EX3200 Switches
• Power Supply in EX3300 Switches on page 21
• Power Supply in EX4200 Switches
• AC Power Supply in EX4500 Switches
• DC Power Supply in EX4500 Switches
• AC Power Supply in an EX6200 Switch
• DC Power Supply in an EX6200 Switch
• AC Power Supply in an EX8200 Switch
• DC Power Supply in an EX8200 Switch
• AC Power Supply in a QFX3500 Switch
Copyright © 2011, Juniper Networks, Inc.44
Complete Hardware Guide for EX3300 Ethernet Switches

Juniper EX3300 Series Specifications

General

Layer Support	Layer 2 and Layer 3
JUNOS OS	Yes
Ports	24 or 48 x 10/100/1000BASE-T ports
Uplink Ports	4 x 1GbE/10GbE SFP/SFP+ ports
Power Supply	AC or DC options
Stacking	Yes, up to 10 units
MAC Address Table Size	32, 000
Operating Humidity	10% to 90% non-condensing
PoE Support	Available on PoE models
Virtual Chassis	Yes, up to 10 units
Operating Temperature	32° to 104° F (0° to 40° C)