Planning Power Budgets; Viewing Statistics - 3Com Baseline 2226-PWR Plus User Manual

Click Apply to save the PoE settings for the port.
3
To configure the PoE settings of another port, click
the port number from the PoE Configuration screen.

Planning Power Budgets

As you connect more PoE devices to the Switch, you
may need to calculate your power budget.
Planning a Power Budget
The Switch can supply a maximum of 15.4 watts to
any of its 24 10/100 ports, provided that the total
power delivered does not exceed 180 watts.
When you plan your network, you need to calculate
the maximum power that you will need to ensure that
the Switch is not expected to supply more than its
maximum capacity.
To calculate the power budget for the Switch, add
together the power requirements of the devices that
will be connected at any one time. The power
requirements of PoE-compliant devices can be found
in the documentation supplied with the device.
If the maximum power for the Switch is exceeded, the
Switch follows the following rule:
Any device connected to a lower port number will
■
take priority over a device connected to a higher
port number.
If the Switch needs to remove power from a device, it
will remove power from the highest numbered port.
When the Switch is power-cycled, it will supply power
to the ports starting with the lowest numbered port
first.
Implementing a Power Plan
If the total power required by your PoE devices is less
than the Switch's power budget, then you can guar-
antee power to every port.
If the total power required by your PoE devices is
more than the Switch's power budget, then you will
not be able to guarantee power to all devices. If this is
the case, you may choose to:
Add additional PoE switches – This will enable you
■
to guarantee power to each port on the Switch
that supplies a Power over Ethernet device. The
remaining ports can be used to supply networking
to those devices that are powered by other means.
Prioritize PoE devices – Since the Switch supplies
■
power to the lowest numbered port first, you
should connect your PoE devices in order of impor-
tance, the most important device being connected
to the lowest numbered port. By monitoring
power consumption and checking if any devices
have been refused power, you can decide whether
additional PoE switches are required.

Viewing Statistics

The Statistics screen shows a summary of traffic sta-
tistics for all ports, as shown in
Viewing Statistics 43
Figure 22.