xStack
®
DES-3528/DES-3552 Series Layer 2 Managed Stackable Fast Ethernet Switch Hardware Installation Guide
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To help prevent electric shock, plug the system and peripheral power cables into properly grounded electrical
outlets. These cable s are equipped wi th three-p rong pl ugs to help ensu re p roper gro unding. Do not use
adapter plugs or remove the grou nding prong from a cabl e. If you must use an extens ion cable, use a 3-wire
cable with properly grounded plugs.
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Observe extensi on ca ble and powe r strip ratin gs. Make sure that the total ampere ratin g of all product s
plugged into the extension cable or power strip does not exceed 80 percent of the ampere ratings limit for the
extension cable or power strip.
•
To help protect your system from sudden, transient increases and decreases in electrical power, use a surge
suppressor, line conditioner, or uninterruptible power supply (UPS).
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Position system cables and power cables carefully; route cables so that they cannot be stepped on or tripped
over. Be sure that nothing rests on any cables.
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Do n ot modi fy power cables or pl ugs. Co nsult a licensed el ectrician or your po wer company for site
modifications. Always follow your local/national wiring rules.
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When con necting or di sconnecting po wer to hot-pl uggable po wer su pplies, if offered with your syste
m,
observe the following guidelines:
Install the power supply before connecting the power cable to the power supply.
Unplug the power cable before removing the power supply.
If the system has multiple sources of power, disconnect power from the system by unplugging all power
cables from the power supplies.
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Move products with care; ensure that all caste rs and/or stabilizers are firmly connected to the system. Avoid
sudden stops and uneven surfaces.
General Precautions for Rack-Mountable Products
Observe the following preca utions for rack stabilit y and safe ty. Also, refer to the rack installation do
cumentation
accompanying the system and the rack for specific caution statements and procedures.
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Systems are considered to be components in a rack. Thus, "component" refers to any sy stem as well as to
various peripherals or supporting hardware.
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Before working on the rack, make sure that the stabilizers are secured to the rack, extended to the floor, and
that the full weight of the rack re sts o n the floor. In stall front a nd side sta bilizers on a si ngle ra ck or front
stabilizers for joined multiple racks before working on the rack.
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Always load the rack from the bottom up, and load the heaviest item in the rack first.
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Make sure that the rack is level and stable before extending a component from the rack.
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Use caution when pressing the component rail release latches and sliding a component into or out of a rack;
the slide rails can pinch your fingers.
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After a component is inserted into the rack, ca refully extend the rail into a lo cking position, and then slide the
component into the rack.
•
Do not overload the AC su pply branch circuit that provides power to the rack. The total rack load should not
exceed 80 percent of the branch circuit rating.
•
Ensure that proper airflow is provided to components in the rack.
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Do not step on or stand on any component when servicing other components in a rack.
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