Powering Devices; Priority; Power Over Ethernet In Converged Networks - Avaya P333T-PWR Installation And Configuration Manual

Chapter 13 Avaya P330 Layer 2 Features
You can add and remove powered devices without manually reconfiguring the
switch, since it performs a periodic automatic load detection scan on non-powered
ports.
• If a powered device that fits the above criteria is detected on a non-powered
port, then power is applied to the port.
• If a powered device is removed from a port, then power is denied to that port.
The disconnected port is then scanned as well.

Powering Devices

The P333T-PWR ports can receive Inline power from one of two sources: an internal
-48VDC power supply or an external DC power supply.
Each port can supply up to 16.5W by default.
The internal power supply delivers a maximum of 200W for all the ports. If you
wish to increase the total power, you can attach a DC power supply to the binding
posts on the rear of the switch.
If a powered device tries to draw more than the maximum allowed for the
connected port, power is denied and you receive an "overcurrent" warning.
Similarly, if the power drops below the lower limit, for a port, power is denied to
that port and an "undercurrent" warning is issued.

Priority

Since the internal power supply may not be capable of driving powered devices on
all the ports simultaneously, Avaya has implemented a priority mechanism.
This mechanism determines the order in which ports are powered after the switch is
booted and powered down if the power resources of the switch are exhausted.
There are three user-configurable priority levels:
• Low
• High
• Critical
The default value is "Low" for all ports.
Within these levels, priority is according to port number: the lower the port number,
the higher the priority.
Power will automatically be restored to PDs according to their priority when the
power budget increases. If the power budget is exceeded, power will not be
provided to a new PD when you attach it, even if you define its priority as "High"
or "Critical."

Power over Ethernet in Converged Networks

64 Avaya P333T-PWR User's Guide