Dell PowerConnect J-8208 Hardware Guide - Page 75

Chapter 4: Site Preparation • 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 switch in a secure area, so that only authorized personnel can access the switch. Related Documentation • Prevention of Electrostatic Discharge Damage on J-EX Series Switches on page 236 • Clearance Requirements for Airflow and Hardware Maintenance for a J-EX8208 Switch on page 67 • Environmental Requirements and Specifications for J-EX Series Switches on page 60 Site Electrical Wiring Guidelines for J-EX Series Switches Table 28 on page 59 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 28: Site Electrical Wiring Guidelines Site Wiring Factor Signaling limitations Radio frequency interference 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 damages unshielded conductors and electronic devices. 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. 59