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I'm a little bit wary of only providing layer 2 serivices to ISPs. It very easily leads to technology lock-in and other problems.

The preferred solution is to provide dark fiber and layer 2 transport, ISP's choice.

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While in an ideal world it would be better to provide dedicated strands of dark fiber from each house, back to a neighborhood traffic aggregation point, that can be considerably more costly than a GPON architecture build.

A compromise is to use a single stage splitter PON architecture. Each ISP is provided dark fiber to the splitter and each ISP can use either splitters or WDM muxes at this flexibility point.

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