PD Classifications
A PD may be classified by the PSE based on the classification information provided by the PD. The intent of PD
classification is to provide information about the maximum power required by the PD during operation. Class 0 is the default
for PDs. However, to improve power management at the PSE, the PD may opt to provide a signature for Class 1 to 4.
The PD is classified based on power. The classification of the PD is the maximum power that the PD will draw across all
input voltages and operational modes.
A PD will return to Class 0 to 4 in accordance with the maximum power draw as specified by
Table 4-5-3
.
Class Usage
Range of maximum power used by the
IEEE 802.3af PD
Range of maximum power used by the
IEEE 802.3at PD
0
Default
0.44 to 15.4 watts
0.44 to 32 watts
1
Optional 0.44 to 4 watts
0.44 to 4 watts
2
Optional 4 to 7 watts
4 to 7 watts
3
Optional 7 to 15.4 watts
7 to 15.4 watts
4
Optional Reserved for Future Use
15.4 to 32 watts
Table 4-5-3: Device class
As Table 4-5-4 is a real testing result and it’s not just following IEEE 802.3af / IEEE 802.3at
standard.
4.5.2 PoE Schedule Profile
This section provides user to configure PoE schedule. The “PoE schedule” helps you to enable or disable PoE power
feeding for PoE ports during specified time intervals and it is a powerful function to help SMB or Enterprise save power and
money.
The PoE Schedule Profile Web Screens show in
Figure 4-5-3
and
Table 4-5-4
.
42
Power
On
Power
On
Power
On
Power
On
6 watts
6 watts
12 watts
12 watts
Total consumption of 36 watts/hr
PoE
PoE
PoE
PoE
5PM
8AM
Power
Off
Power
Off
Power
Off
Power
On
6 watts
6 watts
12 watts
12 watts
Saves 24 watts/hr during off-business hours
PoE
PoE
PoE
PoE
5PM
8AM
Total Saved = 10800 watts/month
PoE
1000Base-T UTP with PoE
PSE with PoE Schedule
PSE with PoE Schedule
User’s Manual of HPOE-1200G / HPOE
2400G