Configure PD Power-On and Power-off Parameters

PoE power-on process falls into the following stages:

• Detection: The PSE detects whether PDs exist.
• Classification: The PSE grades PDs and determines power consumption of PDs. This stage is optional.
• Power-Up: The PSE supplies power to PDs.

You can adjust the parameters set for the previous stages and supply power to PDs of different types.

Configuration Condition

Before configuring PD power-on parameters, ensure that:

• The global PoE function is enabled.
• The interface PoE function is enabled.

Configure PD Detection Mode of an Interface

After the PoE function of an interface is enabled, the PSE detects the resistance capacitance between the power output wire pairs to determine whether PDs exist. The standard detection mode detects only PDs that comply with IEEE802.3af and IEEE802.3at. The standards define PDs and non-PDs, but there is a type of devices with resistance capacitance between those of PDs and non-PDs. The compatible mode can detect this type of devices.

Table 12-12 Configuring the PD Detection Mode of an Interface

Configure the Interface Classification Mode

After the interface PoE function is enabled, the PSE detects the output current of the power supply to determine the power grades of PDs. Power is allocated to PDs according to the power grades of the PDs. PD classification is an optional step. You can skip the step by setting the non-classification mode.

Table 12-13 Configuring the Interface Classification Mode

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  Some non-standard PDs may not support classification. This type of PDs are classified to class0 by default, and the maximum output power of the interface is 15.4 watt.

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Configure Power-On Impulse Current Mode of an Interface

The PoE standard defines the PD power-on impulse current. The parameter is related to PSE, (parasitic) capacitance of the PD, and power of the PD. For the PDs that comply or not comply with the standard, the required power-on impulse current may be different. For different PDs, the related power-on impulse current mode must be configured.

Table 12-14 Configuring the Power-On Impulse Current Mode of an Interface

Configure Power Line Pair of the Interface

PoE standard regulates two modes of power supply: idle line and data line pair. Standard PD needs to support two modes of power supply: signal line pair and idle line pair, but PSE only needs to support one of them.

Table 12-15 Configure the power line pair mode of the interface

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  The PSE device only supports the data line power supply mode.

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Configure the Power-off Detection Mode of the Interface

PSE switches can provide different power failure detection modes according to the current type of power supply, DC or AC.

Table 12-16 Configure the power-off detection mode of the interface

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  The PoE function of PSE equipment is integrated into the switch, which supplies power by the DC mode, and only supports the interface power off detection mode DC.

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