i3 International S81 User Manual page 96

PoE Configuration Parameters:
Items
Power Supply Configuration
Reserved Power
determined by
Power Management
mode
Primary and backup
Power Source.
Port
PoE Mode
Priority
Maximum Power
Description
There are three modes for configuring how the ports/PDs may reserve power.
1. 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.
2. 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. Four different port classes exist and one for 4, 7, 15.4, or 30 Watts. In
this mode the maximum power fields have no effect.
3. LLDP-MED mode: This mode is similar to the Class mode except that each port
determines the amount of 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. In this mode
the maximum power fields have no effect for all modes: if a port uses more power
than the reserved power for the port the port is shut down.
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.
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.
Some switches support having two PoE power supplies. One is used as primary power
source, and one as backup power source. If the switch doesn't support backup power
supply only the primary power supply settings will be shown. In case that the primary
power source fails the backup power source will take over. For being able to determine the
amount of power the PD may use, it must be defined what amount of power the primary and
backup power sources can deliver.
Valid values are in the range 0 to 2000 Watts.
This is the logical port number for this row.
Ports that are not PoE-capable are grayed out and thus impossible to configure PoE.
The PoE Mode represents the PoE operating mode for the port.
Disabled: PoE disabled for the port.
PoE: Enables PoE IEEE 802.3af (Class 4 PDs limited to 15.4W)
PoE+: Enables PoE= IEEE 801.3at (Class 4 PDs limited to 30W)
The Priority represents the ports priority. There are three levels of power priority named Low,
High and Critical.
The priority is used in the case where the remote devices requires more power than the power
supply can deliver. In this case the port with the lowest priority will be turn off starting from
the port with the highest port number.
The Maximum Power value contains a numerical value that indicates the maximum power in
watts that can be delivered to a remote device. The maximum allowed value is 30 W.
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