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Chapter 11: Power Over Ethernet
222
Managing the Maximum Power Limit on Ports
To manage the switch’s power and optimize its power distribution, the
switch allows you to adjust the power limit that the switch provides to each
port. The switch automatically sets a default power limit to the port where
a PD is connected and allows you to change the default settings.
The switch detects the power class of a PD when the PD is connected to
the port. PDs are assigned one of five classes described in “PD Classes”
on page 216. Each class has a maximum power. The switch sets this
value as a default power limit to the port where the PD is connected.
For example, you connect an IP phone to port 1 on the PoE switch. The
switch detects that the power class of the IP phone is 2. The maximum
power output from the switch for a PD of class 2 is 7.0 watts. Thus, the
switch sets 7.0 watts as the default power limit to port 1.
If a PD connected to the port does not support power classification, a
default class of 0 is assigned to the PD. The maximum power for a PD of
class 0 is 15.4 watts so that the switch sets 15.4 watts to the default power
limit to the port.
To change a default power limit to the port, use the POWER-INLINE MAX
command in the Port Interface mode. Specify the value in milliwatts (mW)
See “POWER-INLINE MAX” on page 241.
This example changes the maximum power that the switch provides port 2
to 4.0 watts (4000 milliwatts):
awplus> enable
awplus# configure terminal
awplus(config)# interface port1.0.2
awplus(config-if)# power-inline max 4000