NETGEAR AV Series Hardware Installation Manual page 24

Table 4. PoE port capacities and budgets
Model
M4250-10G2F-PoE+
M4250-10G2XF-PoE+
M4250-10G2XF-PoE++
Supplied power is prioritized according to the port order, up to the total power budget
of the device. Port 1 receives the highest PoE priority, while port 8 is relegated to the
lowest PoE priority.
If the power requirements for attached powered devices (PDs) exceed the total power
budget of the switch, the PoE power to the device on the highest-numbered active PoE
port is disabled to make sure that the devices connected to the higher-priority,
lower-numbered PoE ports are supported first.
Although a device might be listed as an 802.3bt PoE++-powered or 802.3at
PoE+-powered device, it might not require the maximum power limit that is specified
by its IEEE standard. Many devices require less power, allowing all 8 PoE ports to be
active simultaneously when the devices correctly report their PoE class to the switch.
Table 5. PoE classes and PoE power allocations
Device Compatible PoE
Class Standard
0 PoE, PoE+, and PoE++
1 PoE, PoE+, and PoE++
2 PoE, PoE+, and PoE++
3 PoE, PoE+, and PoE++
4 PoE+ and PoE++
5 PoE++
6 PoE++
7 PoE++
8 PoE++
The previous table shows the standard power ranges, calculated with the maximum
cable length of 328 feet (100 meters). If a device receives insufficient PoE power from
the switch, consider using a shorter cable.
Hardware Overview
AV Line of Fully Managed Switches M4250 Series
PoE ports
8 PoE+ (802.3at)
8 PoE+ (802.3at)
8 PoE++ (802.3bt)
Class Description
Default power (full)
Very low power
Low power
Mid power
High power
Ultra high power
Ultra high power
Ultra high power
Ultra high power
Port Capacity
30W
30W
90W
Maximum Power
Reserved for the PD
15.4W
4.0W
7.0W
15.4W
30.0W
45.0W
60.0W
75.0W
90.0W
24
Switch PoE Budget
125W
240W
720W
Power Delivered to
the PD
0.44W–15.8W
0.44W–3.84W
3.84W–7.2W
6.49W–15.9W
12.95W–30.8W
25.5W–47.0W
51.0W–64.4W
62.0W–81.1W
71.0W–96.5W
Hardware Installation Guide