1. Information that is delivered as a unit among peer entities of a network and that may contain control information, address information, or data . 2. In layered systems, a unit of data that is specified in a protocol of a given layer and that consists of protocol-control information of the given layer and possibly user data of that layer.
PROTOCOL DATA UNIT (PDU)
Meaning of PROTOCOL DATA UNIT (PDU) in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012