Not sure I am following the logic of direct bury / underground vs. aerial. I don't think one is necessarily advantageous over the other WRT longevity in terms of life expectancy of the glass. Many other factors go into determining if it goes in the ground or on poles. It's typically much cheaper to go aerial but many areas depending on locale do not allow it so it's got to be underground. Each approach has inherent risks to damage, underground- fiber cuts from digging, aerial- weather and other traffic induced risks.
Underground fiber is either direct-bury or run through conduit. Again, primarily an installation and cost concern.
As for life expectancy, copper in the ground will deteriote but fiber has a much longer life expectancy from degradation thus it doesn't have to be replaced nearly as often (if ever... within reason).
I think BPL is interesting and it definitely has its challenges. I've worked with early implementations and they were less than impressive. I am sure the technology has improved but the public grid is strife with challenges. I think limited deployments may be successful but to think a universally accessible service from any wall outlet, not any time soon. I hope they prove me wrong.
Underground fiber is either direct-bury or run through conduit. Again, primarily an installation and cost concern.
As for life expectancy, copper in the ground will deteriote but fiber has a much longer life expectancy from degradation thus it doesn't have to be replaced nearly as often (if ever... within reason).
I think BPL is interesting and it definitely has its challenges. I've worked with early implementations and they were less than impressive. I am sure the technology has improved but the public grid is strife with challenges. I think limited deployments may be successful but to think a universally accessible service from any wall outlet, not any time soon. I hope they prove me wrong.