Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 593)

Power over Ethernet Introduction
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C 22.9
Negotiating Power Requirements
When configuring PoE on your switch, you can either allow each port to auto-negotiate its
power requirement, based on the power class of its connected PD, or you can statically
configure each port to have a fixed power allocation.
Where dynamic PoE power assignment is used, the total power assigned from your
switch’s power supply will be the total of the individual power requirements assigned to
each port.
To enable your PoE ports to dynamically allocate their power, set the “power-inline max”
on page 23.8 to its default by entering, no power-inline max.
PoE port management
PoE is enabled by default on all non-SFP (or SFP+) RJ-45 ports. You can connect either a
powered or non-powered device to a PoE-enabled port without having to re-configure
the port. This is because PD detection is carried out before any power is supplied to the
connected device.
PoE can be administratively enabled or disabled on each port using the power-inline
enable command in Interface Configuration mode. To disable PoE on a selected port, use
the command:
Powered Device (PD) detection
Your switch applies two methods to detect the connection of a PD. The first method
applies the resistance and capacitance methods defined in the IEEE standards, see
“Power
Device (PD) discovery” on page 22.5 . The second method is applied to detect the
connection of legacy PDs. This method involves measuring for a large capacitance value.
The IEEE method is tried first, and if this fails to detect a PD, the second method is applied.
By default, legacy PD detection is enabled on all ports. To disable legacy PD detection, use
the command:
The switch applies its PD detection process in real time to all PoE enabled ports. It will not
supply power to any PoE enabled port unless it detects the connection of a valid PD.
Port prioritization
Port prioritization enables you to assign ports to be one of the following three priority
levels:
■ Critical
■ High
■ Low
Where the power required collectively by the Powered Devices (PDs) is greater than the
PSUs are able to supply, these priority levels will be used to sequentially remove power
from the PDs in an order of their importance.
awplus(config-if)# no power-inline enable
awplus(config)# no power-inline allow-legacy