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Site Electrical Wiring Guidelines for Juniper Networks Devices
Distance Limitations for Signaling
Radio Frequency Interference
Electromagnetic Compatibility
Copyright © 2018, Juniper Networks, Inc.
Distance Limitations for Signaling on page 349
Radio Frequency Interference on page 349
Electromagnetic Compatibility on page 349
Improperly installed wires can emit radio interference. In addition, the potential for damage
from lightning strikes increases if wires exceed recommended distances or if wires pass
between buildings. The electromagnetic pulse (EMP) caused by lightning can damage
unshielded conductors and destroy electronic devices. If your site has previously
experienced such problems, you might want to consult experts in electrical surge
suppression and shielding.
You can reduce or eliminate the emission of radio frequency interference (RFI) from your
site wiring by using 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.
If your site is susceptible to problems with electromagnetic compatibility (EMC),
particularly from lightning or radio transmitters, you might want to seek expert advice.
Strong sources of electromagnetic interference (EMI) can destroy the signal drivers and
receivers in the network device and conduct power surges over the lines into the
equipment, resulting in an electrical hazard. It is particularly important to provide a properly
grounded and shielded environment and to use electrical surge-suppression devices.
CAUTION:
To comply with intrabuilding lightning and surge requirements,
intrabuilding wiring must be shielded, and the shield for the wiring must be
grounded at both ends.
WARNING:
The intrabuilding ports of the equipment or subassembly are
suitable for connection to intrabuilding or unexposed wiring or cabling only.
The intrabuilding ports of the equipment or subassembly MUST NOT be
metallically connected to interfaces that connect to the Outside Plant (OSP)
or its wiring. These interfaces are designed for use as intrabuilding interfaces
only (Type 2 or Type 4 ports as described in GR-1089-CORE, Issue 4) and
require isolation from the exposed OSP cabling. The addition of primary
protectors is not sufficient protection in order to connect these interfaces
metallically to OSP wiring.
Chapter 41: Electrical Safety Guidelines and Warnings
349
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