Juniper Networks EX8208 ユーザーズマニュアル
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Site Electrical Wiring Guidelines for EX Series Switches
Table 37 on page 94 describes the factors you must consider while planning the electrical
wiring at your site.
wiring at your site.
WARNING: It is particularly important to provide a properly grounded and shielded
environment and to use electrical surge-suppression devices.
environment and to use electrical surge-suppression devices.
Table 37: 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:
experts in electrical surge suppression and shielding:
•
Improperly installed wires cause radio frequency interference
(RFI).
(RFI).
•
Damage from lightning strikes occurs when wires exceed
recommended distances or pass between buildings.
recommended distances or pass between buildings.
•
Electromagnetic pulses (EMPs) caused by lightning
damages unshielded conductors and electronic devices.
damages unshielded conductors and electronic devices.
Signaling limitations
To reduce or eliminate radio frequency interference (RFI) from
your site wiring, do the following:
your site wiring, do the following:
•
Use twisted-pair cable with a good distribution of grounding
conductors.
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.
high-quality twisted-pair cable with one ground conductor
for each data signal when applicable.
Radio frequency interference
Copyright © 2010, Juniper Networks, Inc.
94
Complete Hardware Guide for EX8208 Ethernet Switches