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AC Power Cord Requirements
Should you use your own, make sure that the power cord you use is certified for the country
of end use and suitable for the device. Check your local electrical codes and regulatory
agencies for power cable requirements.
The power cord has to meet the requirements listed in
page 109.
When using multiple power supplies, make sure that each AC power
Note:
supply attaches to an independent power source.
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.
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:
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.
•
Selecting 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 your installation will allow?
•
40 |
Chapter 4. Site Preparation
8800 Series Chassis Switch Hardware Installation Guide
Selecting Power Supply Cords
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