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100m is the specified limit for Ethernet although I have seen it working past that. If your running it at Gig don't push it.
For your run I would suggest you get solid core cable and put wall mounted sockets at each end. Then a short patch cable from the socket to your equipment. That way the normal wear and tear is not on your 40m run. A short patch is easier to replace.
Not sure if they still sell Cat5, you will probably get Cat5e or Cat6.
Most modern network interfaces will autosense so crossover is less relevant now. With the patch leads its easy to drop one in if you need it.
NOTE: Don't buy solid core cable and the crimp plugs, that combination won't work.
ALSO NOTE: Don't buy mulistrand cable and the wall sockets, that combination won't work either.
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