ECS4100 Series Web Management Guide-R07

Table Of Contents
Chapter 13
| Basic Administration Protocols
Power over Ethernet
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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 to high priority
have power enabled in preference to those ports set at low priority. For example,
when a device connected to a port is set to critical priority, the switch supplies the
required power, if necessary by denying power to ports set for a lower priority
during bootup.
Setting the Switchs
Overall PoE Power
Budget
Use the Administration > PoE > PSE (Configure Global) page to set the maximum
PoE power budget for the switch (power available to all RJ-45 ports). The maximum
power budget is fixed at the maximum available setting, which prevents overload
conditions at the power source. If the power demand from devices connected to
the switch exceeds the power budget, the switch uses port power priority settings
to limit the supplied power.
Parameters
These parameters are displayed:
PoE Maximum Available Power – The power budget for the switch. If devices
connected to the switch require more power than the switch budget, the port
power priority settings are used to control the supplied power. Overall
allocated power cannot exceed this setting.
PoE Maximum Allocation Power – Status of the PoE power service provided
to the switch ports.
PoE Power Consumption – Sets a power budget for the switch.
(ECS4100-28P: 50000-190000 milliwatts; Default: 190000 mW
ECS4100-52P: 50000-370000 milliwatts; Default: 370000 mW
ECS4100-12PH: 50000-180000 milliwatts; Default: 180000 mW)
Compatible Mode – Allows the switch to detect and provide power to
powered devices that were designed prior to the IEEE 802.3af PoE standard.
(Default: Disabled)
The switch automatically detects attached PoE devices by periodically
transmitting test voltages that over the Gigabit Ethernet copper-media ports.
When an IEEE 802.3af or 802.3at compatible device is plugged into one of these
ports, the powered device reflects the test voltage back to the switch, which
may then turn on the power to this device. When the compatibility mode is
enabled, this switch can detect IEEE 802.3af or 802.3at compliant devices and
the more recent 802.3af non-compliant devices that also reflect the test
voltages back to the switch. It cannot detect other legacy devices that do not
reflect back the test voltages.
For legacy devices to be supported by this switch, they must be able to accept
power over the data pairs connected to the RJ-45 ports