DES-3550 Layer 2 Fast Ethernet Switch User’s Guide
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Safety Cautions
To reduce the risk of bodily injury, electrical shock, fire, and damage to the equipment,
observe the following precautions.
Observe and follow service markings. Do not service any product except as explained in your
system documentation. Opening or removing covers that are marked with the triangular
symbol with a lightning bolt may expose you to an electrical shock. Only a trained service
technician should service components inside these compartments.
If any of the following conditions occur, unplug the product from the electrical outlet and
replace the part or contact your trained service provider:
– The power cable, extension cable, or plug is damaged.
– An object has fallen into the product.
– The product has been exposed to water.
– The product has been dropped or damaged.
– The product does not operate correctly, when you follow the operating instructions.
• Keep your system away from radiators and heat sources. Also, do not block cooling
vents.
• Do not spill food or liquids on your system components, and never operate the product
in a wet environment. If the system gets wet, see the appropriate section in your
troubleshooting guide or contact your trained service provider.
• Do not push any objects into the openings of your system. Doing so can cause a fire or
an electric shock by shorting out interior components.
• Use the product only with approved equipment.
•
Allow the product to cool before removing covers or touching internal components.
• Operate the product only from the type of external power source indicated on the
electrical ratings label. If you are not sure of the type of power source required, consult
your service provider or local power company.
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To help avoid damaging your system, be sure the voltage selection switch (if
provided) on the power supply is set to match the power available at your location:
– 115 volts (V)/60 hertz (Hz) in most of North and South America and some Far
Eastern countries such as South Korea and Taiwan
– 100 V/50 Hz in eastern Japan and 100 V/60 Hz in western Japan
– 230 V/50 Hz in most of Europe, the Middle East, and the Far East
• Also, be sure that attached devices are electrically rated to operate with the power
available in your location.
• Use only approved power cable(s). If you have not been provided with a power cable
for your system or for any AC-powered option intended for your system, purchase a
power cable that is approved for use in your country. The power cable must be rated
for the product and for the voltage and current marked on the product's electrical
ratings label. The voltage and current rating of the cable should be greater than the
ratings marked on the product.
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To help prevent an electric shock, plug the system and peripheral power cables into
properly grounded electrical outlets. These cables are equipped with three-prong plugs
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