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 specifications.
•
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, we recommend that you plug your system into a
surge suppressor.
For detailed power specifications for your equipment, see "Technical Specifications."
Requirements for Power Cords
Most ExtremeSwitching switches do not ship with power cords. Visit
for information on selecting and purchasing the correct power cords for use with
specific Extreme Networks equipment. The web page provides specifications for power cords in each
country so that you can purchase cords locally.
AC power cords must meet the requirements listed in
Power Cord Requirements for AC-Powered
Switches and AC Power Supplies
on page 475.
UPS (Uninterruptible Power Supply) Requirements
A UPS (uninterruptible power supply) is a device that sits between a power supply (such as a wall
outlet) and a device (such as a switch) to prevent outages, sags, surges, and bad harmonics from
adversely affecting the performance of the device.
Meeting Power Requirements
Site Preparation
176
ExtremeSwitching Hardware Installation Guide
