3com S7906E Installation Instruction

 

1-6 

There are standard PDs and nonstandard PDs. Usually, the PSE can detect only standard PDs and 

supply power to them. The PSE can detect nonstandard PDs and supply power to them only after the 

PSE is enabled to detect nonstandard PDs. 

Follow these steps to enable the PSE to detect nonstandard PDs: 

Enter system view 

— 

Enable the PSE to detect 
nonstandard PDs 

poe legacy enable pse pse-id 

Required 

By default, the PSE can 
detect standard PDs rather 
than non standard PDs. 

 

The maximum PoE power refers to the maximum power that the device can provide to all PSEs. 

The maximum PoE power is determined by the specifications of PoE power supply and user 

configuration through command lines. 

z 

Specifications of PoE power supply: PSEs are powered by PoE power supply. The PoE power 

supply of a device has its maximum output power (assuming the value is M1), which is the 

hardware factor determining the maximum PoE power. 

z 

User configuration through command lines: PoE power supply has self-protection mechanism, 

with which hardware protection measures will be taken (for example, stopping power supply to all 

PSEs) in case of PoE power overload. To avoid possible hardware protection, the device allows 

you to configure a maximum PoE power (assuming the value is M2, which should be lower than 

M1). When the PoE power supply is to reach the overload state before hardware protection occurs, 

the system takes software protection measures (for example, disabling PoE of PSE or shutting 

down the power supply to PSE with a specific priority). 

The actually effective maximum PoE power is the smaller one between M1 and M2, that is 

min(M1,M2). 

When the maximum PoE power is changed, the system will re-allocate power according to power 

supply priority of PSEs. A PSE with a higher priority gets power supply first. For the PSEs with the 

same priority, the one with smaller PSE ID takes precedence. 

Follow these steps to configure the maximum PoE power: 

Enter system view 

— 

Configure the maximum PoE 
power 

poe power max-value 
max-power 

Optional 

The default maximum PoE 
power is 6720.