Extreme Networks BlackDiamond 8810, Руководство по установке оборудования

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Safety Information
Extreme Networks Consolidated XOS Hardware Installation Guide
152
Uninterruptible Power Supply Requirements
An uninterruptible power supply (UPS) 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.
UPS Features
A UPS traditionally can perform the following functions:
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Absorb relatively small power surges.
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Smooth out noisy power sources.
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Continue to provide power to equipment during line sags.
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Provide power for some time after a blackout has occurred.
In addition, some UPS or UPS plus software combinations provide the following functions:
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Automatically shut down equipment during long power outages.
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Monitor and log power supply status.
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Display the voltage (current draw) of the equipment.
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Restart equipment after a long power outage.
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Display the voltage currently on the line.
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Provide alarms on certain error conditions.
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Provide short circuit protection.
Calculating Amperage Requirements
To determine the size of UPS that you need, use the following procedure:
1 To find Volt-Amps (VA), locate the voltage and amperage requirements for each piece of equipment.
These numbers are usually located on a sticker on the back or bottom of your equipment. Then
multiply the numbers together to get VA:
VA = Volts x Amperes
2 Add the VA from each piece of equipment together to find the total VA requirement.
To determine the minimum amperage requirements for your UPS, we recommend that you add 30%
to the total.
UPS Transition Time
Transition time is the time that is necessary for the UPS to transfer from utility power to full-load
battery power. For Extreme Networks products, a transition time of less than 20 milliseconds is required
for optimum performance.