• CCITT Rec. Q.920 (11/1988) – ISDN USER-NETWORK INTERFACE DATA LINK LAYER – GENERAL ASPECTS
  • 1 General
  • 2 Concepts and terminology
  • 3 Overview description of LAPD functions and procedures
    • 3.1 General
    • 3.2 Unacknowledged operation
    • 3.3 Acknowledged operation
    • 3.4 Establishment of information transfer modes
  • 4 Service characteristics
    • 4.1 General
    • 4.2 Services provided to layer 3
    • 4.3 Services provided to layer management
    • 4.4 Administrative services
    • 4.5 Model of the data link service
    • 4.6 Services required from the physical layer
  • 5 Data link layer - Management structure
    • 5.1 Data link procedure
    • 5.2 Multiplex procedure
    • 5.3 Structure of the data link procedure
  • References