Juniper QFX3000-G QFabric, Deployment Manual, Page: 117 / 652

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Environmental Requirements and Specifications for QFX3600 and QFX3600-I Devices
on page 95
Site Electrical Wiring Guidelines
Supported Platforms EX Series , QFabric System , QFX Series standalone switches
This topic applies to hardware devices in the EX Series product family, which includes
switches, the EX Series Redundant Power System (RPS), and the XRE200 External
Routing Engine.
This topic also applies to hardware devices in the QFX Series.
Table 19 on page 91 describes the factors you must consider while planning the electrical
wiring at your site.
WARNING: It is particularly important to provide a properly grounded and
shielded environment and to use electrical surge-suppression devices.
Table 19: Site Electrical Wiring Guidelines
Guidelines Site 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 damage unshielded conductors and
electronic devices.
Signaling limitations
To reduce or eliminate radio frequency interference (RFI) from your site wiring, do the following:
•
Use a 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
•
•
General Electrical Safety Guidelines and Warnings
•
Prevention of Electrostatic Discharge Damage
91 Copyright © 2015, Juniper Networks, Inc.
Chapter 6: Before You Begin