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If you ask me, there are two possible reasons for this:
* Regulatory reasons. FTTH could easily be unbundled, PON is messy.
* Operators have been fooled by vendors. It does happen, you know. PBT, anyone?
And if you ask me there is one and only one possible reason for this:
* Active Ethernet does not scale for mass-market deployments in moderate-to-low density areas. Too many fibers coming in to the CO, too many fibers to fit into existing duct, too many fibers to repair quickly in event of a dig-up. And if you go to remote nodes in the field to eliminate those problems, you're back to the powering and maintenance issues that come along with VDSL and ADSL2, but without the cost avoidance of reusing copper distribution and drop.
Of course, if 80% of your subs live in high rises and your duct network has a median radius of 5 or 7 km, then active Ethernet works just fine.
Didn't we have this conversation a few months ago?