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1. request unit: A message that contains control information such as a request code, function management headers (FMHs), end-user data, or a combination of these types of information.2. response unit: A message that acknowledges a request unit, indicating successful receipt of data or an error condition. An RU can contain prefix information received in a request unit. If positive, the RU can contain additional information (such as session parameters in response to BIND). If negative, the RU can contain sense data that define the exception condition.