•
For systems connected to DC power, turn off power to the chassis by de-energizing the circuit that
feeds the power supply.
This is usually accomplished by turning off a circuit breaker.
Selecting and Purchasing Power Cords
Extreme Networks equipment does not ship with power cords. Visit
www.extremenetworks.com/
product/powercords/
for information on selecting and purchasing the correct power cords for use with
specific Extreme Networks equipment. Specifications for power cords in each country are provided so
that you can purchase cords locally.
The power cord must meet the requirements listed in
Power Cord Requirements for AC Power Supplies
on page 106.
Uninterruptible Power Supply (UPS) 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 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.
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 the installation will allow? (See
UPS Transition Time
on
page 36.)
Note
We recommend that you use a UPS that provides online protection.
Site Preparation
E4G Routers Hardware Installation Guide
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