Power Supply Requirements
Follow these recommendations when you plan power supply connections for your equipment:
•
Place the equipment in an area that accommodates the power consumption and component heat
dissipation specifications.
•
Be sure that your power supply meets the site DC power or AC power requirements of the network
equipment.
•
When you connect power to installed equipment, do not make this connection through an extension
cord or power strip.
•
If your switch includes more than one power supply, connect each power supply to a different,
independent power source.
If a power source fails, it will affect only the switch power supply to which it is connected. If all switch
power supplies are connected to a single power source, the entire switch is vulnerable to a power
source failure.
•
In regions that are susceptible to electrical storms, we recommend that you plug your system into a
surge suppressor.
For detailed power specifications for your equipment, see
ExtremeSwitching SLX 9250 Technical
on page 70.
Requirements for Power Cords
Most ExtremeSwitching devices do not ship with power cords. Visit
for information on selecting and purchasing the correct power cords for use with
specific Extreme Networks equipment. The web page provides specifications for power cords in each
country so that you can purchase cords locally.
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.
Preparing for the Installation
Power Supply Requirements
ExtremeSwitching SLX 9250 Hardware Installation Guide
33
