Juniper EX4100, Hardware Manual

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Table 28: Site Electrical Wiring Guidelines
Site Wiring
Factor Guidelines
Signaling
limitations 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.
Radio
frequency
interference 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.
Electromagnet
ic
compatibility If your site is susceptible to problems with electromagnetic compatibility (EMC), particularly
from lightning or radio transmitters, seek expert advice.
Strong sources of electromagnetic interference (EMI) can cause:
•
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.
Rack Requirements
You can mount the device on two-post racks or four-post racks.
Rack requirements consist of:
• Rack type.
• Mounting bracket hole spacing.
• Rack size and strength.
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