Juniper XRE200 -, Hardware Manual

Page: 55 / 188

Site Electrical Wiring Guidelines
Table 20 on page 55 describes the factors you must consider while planning the electrical wiring at your
site.
WARNING: You must provide a properly grounded and shielded environment and use
electrical surge-suppression devices.
Avertissement Vous devez établir un environnement protégé et convenablement mis
à la terre et utiliser des dispositifs de parasurtension.
Table 20: 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 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
Rack Requirements
You can mount the device on two-post racks or four-post racks.
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