20.3.1 Assigning Power to Ports
- <Structure of this section>
(1) IEEE802.3af/IEEE802.3at standards compliant
This equipment automatically detects the power receiving equipment and supplies power by classifying the power class required by the power receiving equipment. The table below lists the power classes and maximum output power when the Switch classifies power receiving devices.
Note that the power class classification is optional in IEEE802.3af standard. If the powered device does not support the following power classifications, it is classified as Class0:
|
Power class |
Maximum output power |
|---|---|
|
Class0 |
15.4 watts |
|
Class1 |
4.0 watts |
|
Class2 |
7.0 Watts |
|
Class3 |
15.4 watts |
|
Class4 |
30.0 Watts |
You can also set the power to the ports using limit parameter of the configuration command power inline allocation. If the actual power consumption is much smaller than the per-power-class allocation, this setting saves waste.
(2) IEEE802.3bt standards compliant
This equipment automatically detects the power receiving equipment and supplies power by classifying the power class required by the power receiving equipment. The table below lists the power classes and maximum output power when the Switch classifies power receiving devices.
If the powered device does not support the following power classifications, it is classified as Class3.
|
Power class* |
Maximum output power |
|---|---|
|
Class1 |
4.0 watts |
|
Class2 |
7.0 Watts |
|
Class3 |
15.4 watts |
|
Class4 |
30.0 Watts |
|
Class5 |
45.0 Watts |
|
Class6 |
60.0 Watts |
#: Class7 and Class8 are not supported.
The Switch also supports Autoclass function, which is optional by IEEE802.3bt standard. This function is enabled by autoclass parameter of the configuration command power inline allocation.
When this function is enabled and the powered device supports this function, the device measures the maximum power actually consumed by the powered device when it starts supplying power to the powered device. Automatically sets the allocation of power to the port based on the measured results.