Can one end of the network cable connected to the POE switch be directly tested by the line tester?

Yes, I went to a hotel to check the line before, because I didn't know there was a network cable coming out of the POE switch, so I burned a line finder and a line detector directly!

It clearly defines the issues of power detection and control in remote systems, and specifies the way that routers, switches and hubs supply power to IP phones, security systems and wireless LAN access points through Ethernet cables. The development of IEEE 802.3af involves the efforts of many company experts, which also enables the standard to be tested in all directions.

Extended data:

When a POE switch is installed in the network, the working process of the POE switch is as follows:

Detection: First, the poe switch outputs a small voltage at the port until it detects that the cable terminal is connected to the power receiving terminal equipment supporting the IEEE802.3af standard.

PD-side equipment classification: After detecting the PD of the power receiving side equipment, the poe switch can classify the PD equipment and evaluate the power consumption required by the PD equipment.

Start-up power supply: within a configurable period of time (generally less than 15μs), poe switch starts to supply power to PD equipment from low voltage until 48V DC power supply is provided.

Power supply: provide stable and reliable 48V DC for PD equipment, and the power consumption of PD equipment shall not exceed15.4W.

Baidu encyclopedia -POE switch