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Will the 5G backbone be physically and virtually separate from the 4G backbone?

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Not physically. If, for example, a service provider has a 4G cell and wants to add 5G radios to that macro towers, they would likely end up sharing the aggregation and core network back to the data center, perhaps over different wavelengths or different parts of the network, L2/L3 VPNs, or Optical VPNs. Rolling out completely separate networks for both it would become cost prohibitive quickly and much harder to get to ROI. Some parts of the network will be only for 5G, and some shared

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