Dell PowerConnect J-EX4500, Hardware Manual

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•
Follow the prescribed ESD prevention procedures to avoid damaging the equipment.
Static discharge can cause components to fail completely or intermittently over time.
• Install the device in a secure area to which only authorized personnel have access.
Related
Documentation
Prevention of Electrostatic Discharge Damage on J-EX Series Switches on page 186
•
•
Clearance Requirements for Airflow and Hardware Maintenance for J-EX4500 Switches
on page 60
•
Environmental Requirements and Specifications for J-EX Series Switches on page 56
Site Electrical Wiring Guidelines for J-EX Series Switches
Table 22 on page 55 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.
Table 22: 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 damages unshielded conductors
and electronic devices.
Signaling limitations
To reduce or eliminate radio frequency interference (RFI) from your site wiring, do the
following:
•
Use 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 switch
• Electrical hazards as a result of power surges conducted over the lines into the
equipment
Electromagnetic compatibility
Related
Documentation
General Safety Guidelines and Warnings for J-EX Series Switches on page 159
•
•
General Electrical Safety Guidelines and Warnings for J-EX Series Switches on page 185
55
Chapter 4: Site Preparation