The Enhanced Common Public Radio Interface (eCPRI) protocol is used for the
connection between a baseband unit (BBU) and an active antenna unit (AAU) in a
radio base station. After a BBU is connected to an AAU through their CPRI ports, a
link between them is then set up to transmit control-plane, user-plane, and clock
data. In the following sections, an eCPRI interface or port refers to a CPRI interface
or port using the eCPRI protocol.
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