123
Ethernet port.
Standard PoE parameters and comparison
Property
802.3af (802.3at Type 1) 802.3at Type 2
Power available at PD
12.95 W
25.50 W per mode
Maximum power
delivered by PSE
15.40 W
30.00 W per mode
Voltage range (at PSE)
44.0 - 57.0 V
50.0 - 57.0 V
Voltage range (at PD)
37.0 - 57.0 V
42.5 - 57.0 V
Maximum current
350 mA
600 mA per mode
Maximum cable resistance 20 Ω (Category 3)
12.5 Ω (Category 5)
Power management
Three power class levels
negotiated at initial
connection
Four power class levels negotiated
at initial connection or 0.1 W steps
negotiated continuously
Dreading of maximum
cable ambient operating
temperature
None
5°C with one mode (two pairs)
active, 10°C with two modes (four
pairs) simultaneously active
Supported cabling
Category 3 and Category 5
Category 5
Supported modes
Mode A (endspan), Mode B
(midspan)
Mode A, Mode B, Mode A and
Mode B operating simultaneously
Power Devices
Power levels available
Class Usage
Classification current
[mA]
Power range
[Watt]
Class description
0
Default 0 - 4
0.44 - 12.94 Classification unimplemented
1
Optional 9 - 12
0.44 - 3.84
Very Low power
2
Optional 17 - 20
3.84 - 6.49
Low power
3
Optional 26 - 30
6.49 - 12.95 Mid power
4
Reserved 36 - 44
12.95 - 25.50 High power
For IEEE 802.3at (type 2) devices class 4 instead of Reserved has a power range of 12.95 - 25.5
W.
PoE Specification
✓
The port 1 ~ 8 supports the PoE function.
✓
Total-power: The maximum power which the switch can support to the PDs.
Notice: You must reserve about 18 W for the system. That is, if you connect an external
power supported 240W. The total power should be 222W only.
✓
Schedule: The Switch allows user to arrange a week schedule to enable or disable the PoE
for the specific ports.
