Power over Ethernet Settings
3-127
Power over Ethernet Settings
This switch can provide DC power to a wide range of connected devices, eliminating
the need for an additional power source and cutting down on the amount of cables
attached to each device. Once configured to supply power, an automatic detection
process is initialized by the switch that is authenticated by a PoE signature from the
connected device. Detection and authentication prevent damage to non-802.3af
compliant devices.
The switch’s power management enables total switch power and individual port
power to be controlled within a configured power budget. Port power can be
automatically turned on and off for connected devices, and a per-port power priority
can be set so that the switch never exceeds its allocated power budget. When a
device is connected to a switch port, its power requirements are detected by the
switch before power is supplied. If the power required by a device exceeds the
power budget of the port or the whole switch, power is not supplied.
Ports can be set to one of three power priority levels, critical, high, or low. To control
the power supply within the switch’s budget, ports set at critical or high priority have
power enabled in preference to those ports set at low priority. For example, when a
device is connected to a port set to critical priority, the switch supplies the required
power, if necessary by dropping power to ports set for a lower priority. If power is
dropped to some low-priority ports and later the power demands on the switch fall
back within its budget, the dropped power is automatically restored.
Switch Power Status
Use the Main Power Status page to display the Power over Ethernet settings for the
switch.
Command Attributes
• Maximum Available Power – The configured power budget for the switch.
• System Operation Status – The PoE power service provided to the switch ports.
• Mainpower Consumption – The amount of power being consumed by PoE
devices connected to the switch.
• Thermal Temperature
9
– The internal temperature of the switch.
• Software Version – The version of software running on the PoE controller
subsystem in the switch.
9. This parameter is not supported for the current hardware.
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