The present document specifies the Remote Electrical Tilting Application Part (RETAP) between the implementation
specific O&M transport function and the RET Antenna Control unit function of the Node B. The document also
specifies the Tower Mounted Amplifier Application Part (TMAAP) between the implementation specific O&M transport
function and the TMA control function of the Node B. It defines the Iuant interface and its associated signaling
procedures.