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> >In that sense they are very poor "earths", hence the networking > >"purists" (read rich people) recommending optical fibre (or wireless!) > >between buildings, rather than wire networking cables. > > > > > Probably optical fibre because of the lower impedance and greater > bandwidth. Quite apart from the potential difference between the buildings, external electrical influence (such as lightning) is also a consideration. Lightning tends to travel along copper cables with greater ease than FO. It wouldn't matter whether it was the building or the cable that was hit, the other building would be safer because of using FO. Besides, FO cable isn't that much more expensive than copper cabling... it's just that the NICs and router/switch units tend to be more expensive :( Grant. -- Unix: Some say the learning curve is steep, but you only have to climb it once. -- The Mailing List for the Devon & Cornwall LUG Mail majordomo@xxxxxxxxxxxxx with "unsubscribe list" in the message body to unsubscribe. FAQ: www.dcglug.org.uk/linux_adm/list-faq.html