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[is it possible?] PoE switch <-> computer or other non-PoE device

bi3dron 28377 8
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 12535108
    bi3dron
    Level 18  
    Come on :)
    Short question: Is it possible to connect, for example, a print server / PC to the PoE port in the switch, which (PC of course) does not consume electricity from Ethernet? Will I fry electronics in this way, for example on a mobo computer.
    Or maybe such heads figured out that nothing would happen?

    I know that 2 pairs are used for data transmission, etc., etc., but I'm just interested in whether something will happen if I connect a non-PoE device to PoE in the switch :) in fact, it's not so much what I'm interested in, but I have run out of ports in the non-PoE switch, and I need to connect the nettop to the network.

    Do you earn new cables with only 2 pairs?
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    #2 12535127
    bogiebog
    Level 43  
    Crimp the plugs without POE wires, only 2 pairs 1,2,3,6, then you will definitely not fry.
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  • #3 12535154
    bi3dron
    Level 18  
    Ok thanks for the answer ;)

    So now I have to wait for the earner to come back from the field.

    However I am curious if anyone ever tried to connect devices as I wrote above and if something bad happened. Because knowledge will be useful to me in the future.
  • #4 12535215
    bogiebog
    Level 43  
    What signal goes after POE?
    DC / AC?
    V =?

    IMO, RJ45 the signal goes through the separating transformer, so nothing bad should happen, but I would not tempt fate.
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  • #5 12535242
    bi3dron
    Level 18  
    Honestly, I don't know what V, but the current is definitely constant. It's a tp-link switch with 4 PoE ports and 4 regular ports. But ok, I still have this non-PoE one available, so I'll stick it there :P someday, when I have some equipment on sale, it will be insidious and at most I will look at how it melts nicely :D
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    #6 12537294
    rwisniewski1
    Level 23  
    The PoE standard is 48V. You don't need to make any special cables, you can plug in whatever you want, nothing will get fried. After connecting the device to the port, the switch tests what is connected and if it is not a device that uses PoE, it simply turns off the voltage on that port.
    Tell me what the switch is. PoE switches are manageable, so you can manually disable PoE on ports where it is unnecessary.
  • #7 12537809
    bi3dron
    Level 18  
    @ rwisniewski1 - thanks for the info. switch to TL-SF1008P.
  • Helpful post
    #8 12538012
    smario11
    Level 31  
    You can safely plug in, nothing will happen if it is active, i.e. most of the switches. It's about 802.11af
    This technology checks if the hardware on the other side is 802.11af compliant. If it is it turns on the poe on the port, and if not, it does not turn on the power.
    There are also switches with passive poe, e.g. thougswitch from ubnt. Passive poe is used most often in mikrotika and ubnt equipment
  • #9 12538208
    bi3dron
    Level 18  
    I think users rwisniewski1 and smario11 exhausted the topic :)

    Thanks a lot for the answers.

    I consider the topic closed.
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Topic summary

Connecting a non-PoE device, such as a print server or PC, to a PoE switch port is generally safe. PoE switches, like the TP-Link TL-SF1008P, utilize a detection mechanism that tests the connected device. If the device does not require power over Ethernet, the switch will not supply voltage, preventing any damage. The PoE standard operates at 48V, but the switch will disable power on ports where non-PoE devices are connected. Users can also manage PoE settings on compatible switches. It is advisable to use cables with only two pairs (1,2,3,6) to avoid any potential issues.
Summary generated by the language model.
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