Publication date: Sept, 2015
Revision A1
139
2-‐ 13 PoE
PoE is an acronym for Power Over Ethernet.
Power Over Ethernet is used to transmit electrical power to remote devices over standard Ethernet
cable. It could, for example, be used for powering IP telephones, wireless LAN access points and other
equipment, where it would be difficult or expensive to connect the equipment to a main power
supply.
The PoE detect function is described in the table below.
Stages of Powering up a PoE Link
Stage
Action
Volts specified
[V]
802.3af
802.3at
Detection
PSE detects if the PD has the correct
signature resistance of 19–26.5 kΩ
2.7-‐10.1
Classification PSE detects resistor indicating power
range
14.5-‐20.5
Mark 1
Signals PSE is 802.3at capable. PD
presents a 0.25–4 mA load.
─
7-‐10
Class 2
PSE outputs classification voltage again
to indicate 802.3at capability
─
14.5-‐20.5
Mark 2
Signals PSE is 802.3at capable. PD
presents a 0.25–4 mA load.
─
7-‐10
Startup
Startup voltage
>42
>42
Normal
operation
Supply power to device
37-‐45
42.5-‐57
Power levels available
Class
Usage
Power range
[Watt]
Class description
0
Default
15.4
Classification
unimplemented
1
Optional
4
Very Low power
2
Optional
7
Low power
3
Optional
15.4
Mid power
4
Valid for 802.3at (Type 2)
devices, not allowed for
802.3af devices
30
High power
2-‐ 13.1 Configuration
This page allows the user to inspect and configure the current PoE port settings and show all PoE
Supply W.
Web Interface
To configure Power Over Ethernet in the web interface:
1.
Click configuration, PoE, and configuration.
Summary of Contents for LPB2910A
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