Environmental Requirements And Specifications For Junos Space Appliances - Juniper Junos Space JA2500 Hardware Manual

JA2500 Junos Space Appliance Hardware Guide
Table 12: Site Electrical Wiring Guidelines
Site Wiring Factor
Signaling limitations
Radio frequency
interference
Electromagnetic
compatibility
Related
Documentation

Environmental Requirements and Specifications for Junos Space Appliances

22
Table 12 on page 22 describes the factors you must consider while planning the electrical
wiring at your site.
WARNING: It is particularly important to provide a properly grounded and
shielded environment and to use electrical surge-suppression devices.
Guidelines
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.
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.
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 as
follows:
Destruction of the signal drivers and receivers in the appliance.
Electrical hazards as a result of power surges conducted over the lines into the equipment.
Environmental Requirements and Specifications for Junos Space Appliances on page 22
General Electrical Safety Guidelines and Warnings on page 139
General Safety Guidelines and Warnings on page 113
General Site Guidelines for Junos Space Appliances on page 21
This topic applies to the following Junos Space Appliances: JA1500 and JA2500.
The appliance must be installed in a rack housed in a dry, clean, well-ventilated, and
temperature-controlled environment.
Ensure that the following environmental guidelines are followed:
Keep the site as dust-free as possible because dust can clog air intake vents and filters,
reducing the efficiency of the appliance cooling system.
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