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NETGEAR AV Line M4250 GSM4210PX 8-Port Gigabit PoE+ Compliant Managed AV Switch with SFP (220W) User Manual

Page 137

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Table 37. PoE port capacities and budgets (Continued)

Switch PoE Budget

Port Capacity

PoE ports

Model

960W

30W

8 PoE+ (802.3at)

M4250-40G8XF-PoE+

2880W with three
internal PSUs connected

90W

8 PoE++ (802.3bt)

M4250-40G8XF-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.

The following 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.

Table 38. PoE classes and PoE power allocations

Power Delivered to
the PD

Maximum Power
Reserved for the PD

Class Description

Compatible PoE
Standard

Device
Class

0.44W–15.8W

15.4W

Default power (full)

PoE, PoE+, and PoE++

0

0.44W–3.84W

4.0W

Very low power

PoE, PoE+, and PoE++

1

3.84W–7.2W

7.0W

Low power

PoE, PoE+, and PoE++

2

6.49W–15.9W

15.4W

Mid power

PoE, PoE+, and PoE++

3

12.95W–30.8W

30.0W

High power

PoE+ and PoE++

4

25.5W–47.0W

45.0W

Ultra high power

PoE++

5

51.0W–64.4W

60.0W

Ultra high power

PoE++

6

Main User Manual

137

Configure Switch System
Information

AV Line of Fully Managed Switches M4250 Series Main User Manual