purchasing the correct power cords for use with specic Extreme Networks equipment.
The web page provides specications 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 110.
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.
A UPS traditionally can perform the following functions:
• Absorb relatively small power surges.
• Smooth out noisy power sources.
• Continue to provide power to equipment during line sags.
• Provide power for a period of time after a blackout has occurred.
In addition, some UPS devices or UPS-plus-software combinations provide the
following functions:
• Automatically shut down equipment during long power outages.
• Monitor and log power supply status.
• Display the voltage (current draw) of the equipment.
• Restart equipment after a long power outage.
• Display the voltage currently on the line.
• Provide alarms on certain error conditions.
• Provide short-circuit protection.
Select a UPS
To determine UPS requirements for your switch, answer these questions:
• What are the amperage requirements?
• What is the longest potential time period that the UPS would be required to supply
backup power?
• Where will the UPS be installed?
• What is the maximum transition time that the installation will allow? (See Provide a
Suitable UPS Transition Time on page 54.)
Note
Use a UPS that provides online protection.
Site Preparation UPS (Uninterruptible Power Supply) Requirements
ExtremeSwitching 5420 Series Hardware Installation Guide 53
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