3com S7906E Manuel De Montage

 

1-5 

interface is enabled with the PoE power management function (for the detailed description of the PoE 

power management function, refer to 

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. 

 

z 

When the sum of the power consumption of all powered PoE interfaces on a PSE exceeds the 

maximum power of the PSE, the system considers the PSE is overloaded (The maximum PSE 

power is decided by the user configuration). 

z 

Which PoE interface power supply mode is selected depends on the specifications of PDs. A PSE 

can supply power to a PD only when the selected power supply mode is supported by both the 

PSE and PD.   

Follow these steps to enable PoE for a PoE interface: 

Enter system view 

— 

Enter PoE interface view 

interface interface-type 
interface-number 

— 

Enable PoE for the PoE 
interface 

Required 

Disabled by default. 

Configure PoE interface power 
supply mode 

poe mode signal 

Optional 

signal (power over signal 
cables) by default. 

Configure a description for the 
PD connected to the PoE 
interface 

poe pd-description text 

Optional 

By default, no description for 
the PD connected to the PoE 
interface is available.