To prevent RF interference, avoid the following situations:
• Attaching UTP cable to AC power cables
• Routing UTP cable near antennas, such as a ham radio antenna
• Routing UTP cable near equipment that could exhibit RF interference, such as ARC
welding equipment
• Routing UTP cable near electrical motors that contain coils
• Routing UTP cable near air conditioner units
• Routing UTP cable near electrical transformers
In areas or applications where these situations cannot be avoided, use ber optic
cabling or shielded twisted pair cabling.
Meeting Power Requirements
Observe the following requirements and precautions for powering your hardware.
Requirements for PoE Devices
When connecting PoE devices to a PoE switch, all connections between the PoE device
and the switch must remain within the same building and use a low-voltage power
distribution system per IEEE 802.3af.
Power Supply Requirements
Follow these recommendations when you plan power supply connections for your
equipment:
• Place the equipment in an area that accommodates the power consumption and
component heat dissipation specications.
• Be sure that your power supply meets the site DC power or AC power requirements
of the network equipment.
• When you connect power to installed equipment, do not make this connection
through an extension cord or power strip.
• If your switch includes more than one power supply, connect each power supply to a
different, independent power source.
If a power source fails, it will affect only the switch power supply to which it is
connected. If all switch power supplies are connected to a single power source, the
entire switch is vulnerable to a power source failure.
• In regions that are susceptible to electrical storms, plug your system into a surge
suppressor.
For detailed power specications for your equipment, see "Technical Specications."
Requirements for Power Cords
Most ExtremeSwitching switches do not ship with power cords. Visit
www.extremenetworks.com/product/powercords/ for information on selecting and
Meeting Power Requirements Site Preparation
52 ExtremeSwitching 5420 Series Hardware Installation Guide
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