Powered Device Classes For Poe And Poe; Power Delivery With Alternatives A And B; Table 2: Poe And Poe+ Device Classes - Allied Telesis IE340 Series Installation Manual

IE340 Series Installation Guide
Powered Device
Classes for PoE
and PoE+
Power Delivery
with Alternatives
A and B
30
PoE+ devices: Standard TIA/EIA 568-compliant Category 5e, 4-

pair shielded or unshielded cabling. Category 6 is recommended.
Note
Category 3 and 5 cables may be used for EN55024 immunity levels;
however, they are not recommended for IEC61000-6-2 and
EN50121-4 immunity levels.
Note
A Category 6 or 6a shielded or unshielded cable is required to meet
IEC61000-6-2 and EN50121-4 immunity levels.
The PoE and PoE+ standards define five powered device classes. The
classes are defined by the power requirements of the powered devices.
The classes are shown in Table 2. The IE340 PoE PSE switches support
all five classes.
Table 2. PoE and PoE+ Device Classes
Class Usage
0 Default
1 Optional
2 Optional
3 Optional
4 Optional
The PoE standards define two methods for delivering power over twisted
pair cables from power sources such as the Ethernet switch to powered
devices. The methods, called Alternatives A and B, identify the wire
strands that carry the electrical power over the Ethernet cables to the
powered devices from the power source, which in this case is the
switch sourcing PoE.
Twisted pair cabling usually has eight strands. For 10Base-T and
100Base-TX devices, the wire strands connected to pins 1, 2, 3, and 6
carry the network traffic while the strands connected to pins 4, 5, 7, and 8
are unused. 1000Base-T devices use all eight strands to carry network
traffic.
For PoE and PoE+ devices, power is delivered over four of the eight
Maximum
Power Output
PD Power Range
at the Switch
Port
15.4W 0.44W to 12.95W
4.0W 0.44W to 3.84W
7.0W 3.84W to 6.49W
15.4W 6.49W to 12.95W
30.0W 12.95W to 25.9W