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CHAPTER 10: POWER OVER ETHERNET APPLICATION
NOTE: This chapter applies only to PoE managed models (LIE401A, LIE1014A, LIE1080A and LIE1082A).
These switches support the PoE function for connected powered devices. The operation mode contains 802.3af (15.4W), 802.3at
(30W), and 802.3at with 4 pair used (60W). 60 watts only can be applied for port 1 and 2. Each port has 5 classes for selection,
class 0–4. The total power budget of the system is up to 240 watts.
The PoE switches support power scheduler for each PoE port. Each time interval is 30 minutes from Sunday to Saturday. You can
select which interval to set PoE on or PoE off. The switch also supports a PoE reset function to power off, then power on the PoE
function on a port at certain time. A maximum of five times can be created in a week.
10.1 RESERVED POWER DETERMINATION
There are three modes for configuring how the ports/PDs may reserve power.
1. Class mode: In this mode each port automatically determines how much power to reserve according to the class the connected
PD belongs to, and reserves the power accordingly. Five different port classes exist and one for 4, 7, 15.4 or 30 Watts.
2. Allocated mode: In this mode, the user allocates the amount of power that each port may reserve. The allocated/reserved power
for each port/PD is specified in the Maximum Power fields.
3. LLDP-MED mode: This mode is similar to the Class mode except that each port determines the amount power it reserves by
exchanging PoE information using the LLDP protocol and reserves power accordingly. If no LLDP information is available for a port,
the port will reserve power using the class mode
NOTE: For all modes: If a port uses more power than the reserved power for the port, the port is shut down.
10.2 POWER MANAGEMENT MODE
There are 2 modes for configuring when to shut down the ports:
1. Actual Consumption: In this mode, the ports are shut down when the actual power consumption for all ports exceeds the
amount of power that the power supply can deliver or if the actual power consumption for a given port exceeds the reserved power
for that port. The ports are shut down according to the ports priority. If two ports have the same priority, the port with the highest
port number is shut down.
Port Priority: Critical > High > Low.
When priorities are the same, the lower number port has higher priority.
2. Reserved Power: In this mode, the ports are shut down when total reserved powered exceeds the amount of power that the
power supply can deliver. In this mode, the port power is not turned on if the PD requests more power than available from the power
supply.
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