This MO represents the Operative Status of the Encryption function over the Radio Link hop and refers to receiving direction. Therefore, it indicates if the receiving side is able or not able to correctly/successfully decipher the ciphered data stream transmitted from remote side.. The ecryption status can assume the values: - up: control and traffic plain are correctly deciphered; - down: control and traffic plain are not deciphered correctly/successfully, due to e.g. authentication failure, disturbance over the radio-hop.