Originally Posted by Butuz
Reason copper cat5 should not be used outside is because if anything happens to the insulation, i.e water gets in, you could risk damaging the switch/router/NIC at each end of the cable. At home when you have a £40 router thats not much of a problem, but in insustry when the switches either side of the cable may have set you back £3k each that is a problem. Is also very succeptible to lightning strikes etc.
Fibre optic doesnt carry electronic signals so if its hit by lightning, cut, shorted, submerged in water, it wont make a blind bit of difference to the £3k switches at either end.
To be honest i've tried wireless between my houses (2 driveways in between as well as the 2 external walls) and its too flaky signals too poor. I am gonna run sheilded cat 5 through a hosepipe or the like and through trunking under both carports. I dont mind if anything happens to my £40 netgear router and free 24 port switch at either end, the risks are pretty low, low enough for me at home, but far too high for me at work. You should see the amount of fibre between the buildings in work!
Butuz