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BTS are usually linked to MSC by fiber whenever that's feasible. If fiber is unavailable

or too expensive, the "backhaul" network consists of high-capacity, short distance,

low power digital microwave links. In the US, the popular frequencies for this application

are the licensed bands in 11, 18, 23, and 38 GHz, as well as the unlicensed bands in

5.9, 28, and 80 GHz.

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