H3C Technologies H3C S7500E Series Switches - Manual (Page 104)

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z If the PSE is enabled with the PoE power management function, you are allowed to enable
PoE for the PSE (whether the PSE can supply power depends on other factors, for example,
the power supply priority of the PSE).
Follow these steps to enable PoE for a PSE:
To do… Use the command… Remarks
Enter system view system-view —
Enable PoE for the PSE poe enable pse pse-id
Required
Disabled by default.
When the sum of the power consumption of all PSEs exceeds the maximum power of PoE, the
system considers the PoE is overloaded (The maximum PoE power is decided by the hardware
specifications of a PoE power supply and the user configuration).
Enabling PoE for a PoE Interface
The system does not supply power to or reserve power for the PDs connected to a PoE
interface if the PoE interface is not enabled with the PoE function.
You are allowed to enable PoE for a PoE interface if the PoE interface will not result in PoE
power overload; otherwise, whether you can enable PoE for the PoE interface depends on
whether the PoE interface is enabled with the PoE power management function (for the detailed
description of the PoE power management function, refer to Configuring PoE Power
Management ).
z If the PoE interface is not enabled with the PoE power management function, you are not
allowed to enable PoE for the PoE interface.
z If the PoE interface is enabled with the PoE power management function, you are allowed
to enable PoE for the PoE interface (whether the PDs can be powered depends on other
factors, for example, the power supply priority of the PoE interface).
The PSE supplies power for a PoE interface in the following two modes:
z Over signal wires: The PSE uses the pairs (1, 2, 3, 6) for transmitting data in category 3/5
twisted pair cables to supply DC power while transmitting data to PDs.
z Over spare wires: The PSE uses the pairs (4, 5, 7, 8) not transmitting data in category 3/5
twisted pair cables to supply DC power to PDs.