Data Link Layer Frame Access Protocol (LAPF) Defines in ITU Q.922, is a enhancement LAPD (Q.921) that provides congestion control performance in frame network. Its main functions are:
Frame definition, queue, logo transparency; virtual circuit multiplexing technology and release multiplexing technology; eight-bit byte queue: 0 Bacout quarter byte; check frame size minimum and maximum value; error monitoring, sequence And non-copy; congestion control;
The role of the LAPF is to carry a traffic on the B, D or H path of the ISDN user-network interface, and transmit data link layer service data unit (SDU) between data link (DL) service users on the user plane. . The frame mode carries the link service, or established by the program described in Q.933, or for a permanent virtual circuit. LAPF can use physical layer services and allow compatibility with HDLC programs to provide statistical multiplexing techniques for one or more frames in the B, D or H path of the ISDN user-network interface.
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