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basic information unit. The unit of control information and data that is transmitted between half-sessions. It consists of a request/response header (RH), followed by a request/response unit (RU).

Basic Information Unit. The unit of data and control information in SNA that consists of a request/response header followed by a request/response unit and that is passed between half-sessions.

basic information unit. In SNA, the unit of data and control information passed between the transmission and control layers. It consists of a request or response header followed by a request or response unit.

See basic information unit (BIU).

back inflation unit. A type of BC with all the floatation positioned behind the diver's back.