Table 22: Site Electrical Wiring Guidelines (continued)
GuidelinesSite Wiring Factor
To reduce or eliminate 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 device
•
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 239•
• General Electrical Safety Guidelines and Warnings on page 261
• Prevention of Electrostatic Discharge Damage on page 263
Environmental Requirements and Specifications for a QFX5100 Device
The switch must be installed in a rack or cabinet. It must be housed in a dry, clean,
well-ventilated, and temperature-controlled environment.
Follow these environmental guidelines:
•
The site must be as dust-free as possible, because dust can clog air intake vents and
filters, reducing the efficiency of the switch cooling system.
•
Maintain ambient airflow for normal switch operation. If the airflow is blocked or
restricted, or if the intake air is too warm, the switch might overheat, leading to the
switch temperature monitor shutting down the device to protect the hardware
components.
Table 23 on page 70 provides the required environmental conditions for normal switch
operation.
Table 23: QFX5100 Switch Environmental Tolerances
ToleranceDescription
No performance degradation to 6,562 feet (2000 meters)Altitude
Copyright © 2016, Juniper Networks, Inc.70
QFX5100 Switch Hardware Guide
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