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Catalyst 4500 E-Series Switches Installation Guide
OL-13972-02
Chapter 2 Preparing for Installation
Site Requirements
Note
To predict and remedy strong EMI, you may also need to consult experts in radio frequency interference
(RFI).
If you use twisted-pair cable in your plant wiring with a good distribution of grounding conductors, the
plant wiring is unlikely to emit radio interference. If you exceed the recommended distances, use a
high-quality twisted-pair cable with one ground conductor for each data signal when applicable.
Caution
Category 5e, Category 6, and Category 6a cables can store large levels of static electricity because of the
dielectric properties of the materials used in their construction. Always ground the cables (especially in
new cable runs) to a suitable and safe earth ground before connecting them to the module.
If the wires exceed the recommended distances, or if wires pass between buildings, give special
consideration to the effect of a lightning strike in your vicinity. The electromagnetic pulse caused by
lightning or other high-energy phenomena can easily couple enough energy into unshielded conductors
to destroy electronic devices. If you have had problems of this sort in the past, you may want to consult
experts in electrical surge suppression and shielding.
Shock and Vibration
Catalyst 4500 E-series switches have been shock- and vibration-tested for operating ranges, handling,
and earthquake standards to NEBS (Zone 4 per GR-63-Core). These tests have been conducted in
earthquake environment and criteria, office vibration and criteria, transportation vibration and criteria,
and packaged equipment shock.
Power Source Interruptions
Systems are especially sensitive to variations in voltage supplied by the AC power source. Overvoltage,
undervoltage, and transients (or spikes) can erase data from memory or even cause components to fail.
To protect against these types of problems, power cables should always be properly grounded. Also,
place the system on a dedicated power circuit (rather than sharing a circuit with other heavy electrical
equipment). In general, do not allow the system to share a circuit with any of the following:
•
Copy machines
•
Air conditioners
•
Vacuum cleaners
•
Space heaters
•
Power tools
•
Teletype machines
•
Laser printers
•
Facsimile machines
•
Any other motorized equipment
