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Can a PoE injector fry a laptop network card?

Discussion in 'Hardware' started by toontech, Feb 15, 2013.

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  1. toontech

    toontech Thread Starter

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    A colleague plugged a network cable that was powering a cisco conference phone into a laptop and got no network. Obviously the laptop was working fine before that. Did the PoE injector fry the network card?
    Is there any other possibility?

    Will i have to change the system board? Or is there usually a way of changing the nic only?

    I plugged the laptop into a docking station but still get no network.

    Cheers
     
  2. managed

    managed Trusted Advisor Spam Fighter

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    You should be able to fit a new wireless card but I can't say if it will work or not, depends on what damage was done.

    You should be able to use a Usb wireless dongle. Alternatively a PCMCIA/Express wireless card depending on the laptop.

    What laptop is it ? Apart from the wireless is everything else working ok ?
     
  3. toontech

    toontech Thread Starter

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    Sorry if i wasnt clear, it's the ethernet that isn't working, wireless is still working. So the poe injector was plugged into the wired network port ever since i havent been able to vet a hard wired connection. Either directly to the port or via docking station
     
  4. Simba7

    Simba7

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    Ouch.. 48v directly into a network jack?

    Yep. I definitely think you fried the heck out of it. Surprised you didn't smoke the whole laptop. If the laptop is still working, you could find a USB 2.0 network adapter and use that.
     
  5. managed

    managed Trusted Advisor Spam Fighter

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    No need to say sorry it was me that got it wrong. I've been dealing with a lot of wireless stuff lately and got mixed up.

    I agree with Simba7 that you're lucky it still works at all and that a Usb to ethernet adapter is one possible solution, there are PCMCIA ethernet adapters too if the laptop has the right socket for one.

    You didn't say what laptop it is.
     
  6. toontech

    toontech Thread Starter

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    It's a hp 8530p, i'd need the laptop to work in a docking station as well. Would a pcmcia card provide that ability?
     
  7. Simba7

    Simba7

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    That particular laptop doesn't have a PCMCIA/CardBus slot. It has an Express Card/54 slot.

    You'll have to find an Express Card/54 network card. There is an abundance of them on eBay. If not, you can always go with USB.

    EDIT: Why it fried is due to the port being Gigabit. Usually GbE ports use all 8 wires. Unfortunately, when you shove 48v through something designed to take much, much less.. it tends to fry it as this person found out. http://forum.mikrotik.com/viewtopic.php?f=3&t=48934

    Did it smell strange when your colleague plugged the cable in?
     
  8. Triple6

    Triple6 Moderator

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    Only a new motherboard, or laptop, will allow you to use it with a dock.
     
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