User Manual

Table 76. PoE and PoE+ device class power allocation
Device
Class
Standard Range of Power
Delivered to the
Powered Device
Minimum Output at
PoE Switch Port
(Minimum Allocated)
Maximum Output at
PoE Switch Port
(Maximum Allocated)
0 PoE and PoE+ 0.44W–12.95W 15.4W 16.2W
1 PoE and PoE+ 0.44W–3.84W 4.0W 4.2W
2 PoE and PoE+ 3.84W–6.49W 7.0W 7.4W
3 PoE and PoE+ 6.49W–12.95W 15.4W 16.2W
4 PoE+ only 12.95W–25.5W 30.0W 31.6W
Insight Managed 8-Port Gigabit (Hi-Power) PoE+ Smart Cloud Switch with NETGEAR FlexPoE Power
Manage Power over Ethernet User Manual401
Power allocation and power budget
concepts
The switch is a smart switch in that it can allocate the required power to a connected device
by using a prioritization scheme: By default, power is supplied in ascending port order (that
is, lower port numbers are served first) until the power budget is consumed and insufficient
power remains to allocate to the next device. When less than 7W of PoE power is available
on a port, the port PoE LED lights yellow, and the attached device does not receive power
from the port. However, the switch continues to send data through the port connection.
The switch is also a smart switch in that it can override the IEEE power classification of a
powered device (PD): If the PD consumes less power than required by its power
classification, the switch provides only the power that the PD consumes instead of the power
that is required by the PD’
s power classification.
If some PoE+ ports are in use and deliver power, you can calculate the available power
budget for the other PoE+ ports by subtracting the consumed (that is, delivered power) from
the total available power budget. (For information about the total available power budget, see
PoE concepts on page 400.)
An example for model GC108P:
Port 1 delivers 4.4W to a PD. If the default power adapter is installed, the available power
budget is 59.6W (64W–4.4W).
An example for model GC108PP:
A Class 4 PD is attached to Port 1, a Class 2 PD to Port 2, and another Class 4 PD to Port 3.
However
, the PDs consume less power than defined by their classes: The PD attached to
Port 1 consumes 7.3W, the PD attached to Port 2 consumes 4.7W, and the PD attached to
Port 3 consumes 8.9W. So even though the switch provides power to two Class 4 devices
and one Class 3 device, the available power budget is 105.1W (126W–7.3–4.7–8.9W).