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  1. #11
    Senior Member mossoi's Avatar
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    So you've tried different cards, different PCI slots, different manufacturers, different ports/hubs and all the NIC's actually burn out?

    This is an odd one. All I can think of is that the mobo might be faulty (but why it should pick on NICs only seems a bit strange) or that there may be some sort of surge coming through the patch cable. Does it run parallel to any other cables (power specifically) that could be causing a power surge by induction? This is very unlikely but it's about the only possibility left! You could try fitting a ferrous collar to the patch cable to see if that filters out anything induced from external sources.

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  3. #12
    Senior Member rosland's Avatar
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    Originally posted by mossoi
    ...or that there may be some sort of surge coming through the patch cable. Does it run parallel to any other cables (power specifically) that could be causing a power surge by induction? This is very unlikely but it's about the only possibility left!
    That might be it. Of all the PCI cards, this is the only one with an external cable connected. Sitting low in the cabinet, the cable runs parallell with some powercords.
    Never heard of powersurges causing inducted currents in these cables, but like you said, there's not many other options left.
    S. Rosland

  4. #13
    Senior Member mossoi's Avatar
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    I've only encountered this once before myself. A power outage caused a generator to kick in supplying a power surge to part of the network via one of the switch racks. It blew something like 100 NICs - some of these were affected by what may have been induction as they were on switches that weren't directly affected by the surge.

  5. #14
    Member Skotster's Avatar
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    comming from someone studying for a CCNA certification in in networking, i've never known a network to be contuinously burned out. A power line shouldn't cause surges wihin the patch cable, but i wouldn't say it's impossibel. you may want to double check the wire going in to the machine. you may have the wrong type of wire. you may have a rollover and really need a patch or vise versa, and since they carry power on different wires (there are 6 little wires in each cable) and possible burned the recievers on the network card.
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  6. #15
    WDF Staff Wired's Avatar
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    The NIC has its own power cord???
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  7. #16
    Senior Member mossoi's Avatar
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    On a standard patch cable (Cat5/Cat5e) there are two pairs in use - one TX pair and one RX pair - these carry low voltage signals but there isn't a 'power' cable as such hence the need to use a Fluke to test the integrity of the pairs.

    On a crossover cable (rollover??) the TX and RX pairs are swapped at one end.

  8. #17
    Member Skotster's Avatar
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    you were right the first time, its a crossover. there is no such thing as a rollover. it's not a dog, it dosen't do tricks.

    "Roll over boy, roll over.... good boy"
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