In a protocol data unit (PDU), the field that (a) contains data interpreted by the receiving destination logical- link controller (LLC) and (b) may be the field immediately following the destination service access point (DSAP) and source service access point (SSAP) address fields of the PDU.
CONTROL FIELD
Meaning of CONTROL FIELD in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012