Juniper QFX5100, Hardware Manual

Page: 64 / 256

Table 13: 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 on page 113
•
•
General Electrical Safety Guidelines and Warnings on page 141
•
Prevention of Electrostatic Discharge Damage on page 142
•
Power Supply in EX2200 Switches
•
Power Supply in EX3200 Switches
•
Power Supply in EX3300 Switches
•
Power Supply in EX4200 Switches
•
AC Power Supply in EX4300 Switches
•
DC Power Supply in EX4300 Switches
•
AC Power Supply in EX4500 Switches
•
DC Power Supply in EX4500 Switches
•
AC Power Supply in EX4550 Switches
•
DC Power Supply in EX4550 Switches
•
AC Power Supplies in an EX6200 Switch
•
DC Power Supply in an EX6200 Switch
Copyright © 2014, Juniper Networks, Inc. 46
QFX5100 Switch Hardware Guide