The power supply port can be expanded through cascading switches or using PoE injectors (Midspan).

Yes, data and power are transmitted through the same Ethernet cable without interfering with each other.

Check the quality of the network cable or replace the cable.   

 Reduce device power requirements (such as disabling non essential functions).   

 Ensure that the switch is not operating at overload.

1. The device does not support PoE.  

2. The total power of the switch is insufficient.  

3. The network cable is damaged or too long.  

4. The PoE function of the switch is not enabled (some models require manual activation)

High power models may require a good heat dissipation environment, and it is recommended to install them in a ventilated location to avoid high temperature environments.

Yes, it is. PoE switches have overload protection, short circuit protection, and comply with IEEE standards to ensure safe power supply.

Consider the following factors: 

Number and speed of ports (such as 8/24 ports, 100Mbps/1G).   

 Total power demand (total power ≥ sum of all equipment power).   

 Standard support (PoE, PoE+, PoE++).   

 Management function (whether a network managed switch is required).

Okay. The PoE switch will automatically detect whether the device needs power (through the "handshake protocol"), and only power devices that support PoE to avoid damaging non PoE devices.