Here's a bit of the clear and practical:
Gallo says fiber-optic systems are also robust, almost infinitely upgradable and considerably cheaper to maintain. For the telecoms, making the transition to fiber is "a no-brainer," he says.As lagniappe there's a pretty extensive discussion of New Orleans' fiber in the sewer (really fiber around the sewer, but that's being picky and no fun) and the pipe-bursting technology it's based on. (Don't miss the link to the pop-up graphic of bursting pipe.) You gotta have a little of the geek in you to really enjoy this one, but if you do it's a real treat.