Some trends we now are seeing in the Japanese broadband access market raise potential issues for all access network architects. Specifically, the issue is that consumer networks are designed asymmetrically, and P2P uploading requires symmetry. One might like to design a network so flexible that bandwidth can be provisioned "on demand." The problem is that such a network typically implies an optical infrastructure with a fairly sophisticated degree of intelligence, to supply granular increases in bandwidth, on a "dial it up and it happens" basis.
And that's expensive, particularly so since the network has to be built past all potential end user locations, even when actual demand will vary widely, stranding some of the assets.
Some networks, with short access loops, might finesse the issue by deploying VDSL. Others are simply going to have to look at fiber-rich networks. Expensive stranded assets might result, in that case.
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