The dawn of the 5G era will require a massive infusion of fiber deep into networks to provide a foundation for the explosion of mobile data traffic that will occur around 2020. To prepare for this infusion, you need to plan now for your next fiber upgrade.
Back to the question - the assumption made here is that 5G gets deployed with all the bells and whistles + high frequency options which push the bandwidth needed on a cell into N x Gbps.
However, it will be like 4G - different allocations and frequencies will imply different distance limits and bit rates.
[At this time], for 4G, it has turned out that high bandwidth is mainly in cities and hot spots, but many more rural cells run with microwave backhaul at 100 Mbps to fractional Gbps.
The 1st rollout to get sensible 5G coverage isn't going to use a cell [on every] lampost, except where the user density makes it worthwhile.
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