
2-24 Extreme Networks Consolidated Hardware Guide
Site Preparation
UPS Features
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 some time after a blackout has occurred.
In addition, some UPS or UPS plus software combinations provide the following
functions:
• Automatic shutdown of equipment during long power outages.
• Monitoring and logging of 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.
Selecting a UPS
To determine UPS requirements for your switch, ask 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 your installation will allow?
Extreme Networks recommends that you use a UPS that provides online
protection.
Calculating Amperage Requirements
To determine the size of UPS that you need, use the following procedure:
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