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Network cable with T568A at one end and T568B at the other end

I have a client that moved into their office building and inherited a wired network of Cat5e cable, patch panel and RJ45 jacks. The patch panels seem to have been punched down using the T568B scheme, but many of the network jacks were punched down using the T568A scheme. I was told they used to work, but the one I tested wasn't working, but the jack had some pin issues. I am being told the network is really slow at times. So... my question is... will using T568A at one end of a network cable work with it being T568B at the other end? If so, would it cause the network to be slow?

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Dave Baldwin

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Rafael

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Perarduaadastra

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Rob Williams

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G27

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For some reason I wasn't thinking about a crossover cable being 568A at one end and 568B at the other end. Thanks for the clearing that up. By the way... I am running on a Gigabit network and the cables are not close to fluorescent lights or three-phase power cables. I was aware of the issue with them coming close to fluorescent lights and elevator shafts, but didn't realize I should be concerned with three-phase power cabling. Makes sense though.