Extreme Networks BlackDiamond 10808 Installation Manual page 171

When connecting power over Ethernet (PoE) devices to a PoE switch, all connections between the PoE
device and the switch must remain within the same building and use a low-voltage power distribution
system per IEEE 802.3af.
Adhere to the following requirements to operate your Extreme Networks equipment safely:
Ensure that your equipment is placed in an area that accommodates the power consumption and
component heat dissipation specifications.
Ensure that your power supply meets the site power or AC power requirements of the network
equipment.
When connecting power to installed equipment, avoid connecting through an extension cord or
power strip.
If your switch includes more than one power supply, connect each power supply to different,
independent power sources.
If a single power source fails, it will affect only the power supply to which it is connected. If all the
power supplies on a single switch are connected to the same power source, the entire switch is
vulnerable to a power failure.
For power specifications for Extreme Networks products, see the Extreme Networks website at:
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.
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