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BBU to RRU Protocal Plans Illustration

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Protocol Plans

As descried in the diagram below the protocol includes four plans:

Front Haul

U-Plan:       User Plane – refers to IQ sample data transferred between BBU and RRU

C-Plan:       Control Plane – refers specifically to real-time control between BBU and RRU.

S-Plane:     Synchronization Plane – refers to traffic between the BBU and RRU to a synchronization controller which is generally an IEEE 1588 Grand Master.

M-Plane:    Management Plane – refers to non-real-time management operations between the BBU and the RRU

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