Port Power Priority - Avaya 4524GT Configuration Manual

Power over Ethernet
require different levels of power, the overall available power budget of the switch; depends on
your power configuration and the particular connected network devices. If you connect an IP
device that requires more than 16 W of power, you see an error on that port notifying you of
an overload.
The Avaya Ethernet Routing Switch 4500 Series 4550T-PWR,4548GT-PWR, 4526T-PWR and
4526GTX-PWR automatically detect each IEEE 802.3af-draft-compliant powered device
attached to each front-panel port and immediately sends power to that appliance. The switches
also automatically detect how much power each device requires and supply the required DC
voltage at a set current based on the load conditions and current availability. The switches
support both PoE and standard LAN devices.
The power detection function of the Avaya Ethernet Routing Switch 4500 Series 4550T-
PWR,4548GT-PWR, 4526T-PWR and 4526GTX-PWR operate independently of the data link
status. A device that is already operating the link for data or a device that is not yet operational
can request power. That is, the switches provide power to a requesting device even if the data
link for that port is disabled. The switches monitor the connection and automatically disconnect
power from a port when you remove or change the device, as well as when a short occurs.
The switches automatically detect devices that require no power connections from them, such
as laptop computers or other switching devices, and send no power to those devices. You
control the supply of power to specific ports by setting the maximum allowed power to each
port in 1 W increments, from 3 W to 16 W.
Important:
Allow 30 seconds between unplugging and replugging an IP device to the switch to enable
the IP device to discharge. If you attempt to connect earlier, the switch may not detect the
IP device.
The Avaya Ethernet Routing Switch 4500 provides the capability to set a PoE power threshold,
which lets you set a percentage of the total PoE power usage at which the switch sends a
warning trap message. If the PoE power usage exceeds the threshold and SNMP traps are
appropriately configured, the switch sends the pethMainPowerUsageOnNotification trap. If
the power consumption exceeds and then falls below the threshold, the switch sends the
pethMainPowerUsageOffNotification trap.

Port power priority

You can configure the power priority of each port by choosing low, high, or critical power priority
settings.
The switch automatically drops low-priority ports when the power requirements exceed the
available power budget. When the power requirements becomes lower than the switch power
budget, the power returns to the dropped port. When several ports have the same priority, one
of them must be dropped. In this case, the port with the highest port number is dropped.
60 Configuration — System April 2011