User manual

C HAPTER 4 | Configuring the Switch
Power over Ethernet
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and reserves power accordingly. Four different port classes exist,
including 4, 7, 15.4 or 34.2 Watts.
In this mode, the Maximum Power fields have no effect.
■
Allocation – The amount of power that each port may reserve is
specified. The allocated/reserved power for each port/PD is
specified in the Maximum Power fields.
■
LLDP-MED – This mode is similar to the Class mode expect 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
In this mode the Maximum Power fields have no effect
For all modes, if a port uses more power than the power reserved for
that port, it is shut down.
◆ Power Management Mode – There are two modes for configuring
when to shut down the ports:
■
Actual Consumption – Ports are shut down when 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 power reserved for that port. The ports are
shut down according to port priority. If two ports have the same
priority, the port with the highest port number is shut down.
■
Reserved Power – 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.
◆ Primary Power Supply - The power budget for the switch. If devices
connected to the switch require more power than the switch’s budget,
the port power priority settings are used to control the supplied power.
(Range: 0-190 Watts)
◆ Port – Port identifier.
◆ PoE Mode – The PoE operating mode for a port includes these options:
■
Disabled – PoE is disabled for the port.
■
PoE – Enables PoE IEEE 802.3af (Class 4 PDs limited to 15.4W)
■
PoE+ – Enables PoE+ IEEE 802.3at (Class 4 PDs limited to 34.2W)
◆ Priority - Port priority is used when remote devices require 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.