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• CCITT Rec. Q.930 (11/1988) – ISDN USER-NETWORK INTERFACE LAYER 3 – GENERAL ASPECTS
• 1 General
  • 1.1 Introduction
  • 1.2 Connection control by the user of an ISDN requires:
  • 1.3 Services provided by the data link layer
  • 1.4 Symmetry of the layer 3 protocol
• 2 Structure of layer 3
  • 2.1 Categories of functions
  • 2.2 Layer 3 functions
• 3 Structure of layer 3 Recommendations
• 4 Interface between layer 3 and the adjacent layers
  • 4.1 Overview of the interfaces
  • 4.2 Interface between layer 3 and data link layer
  • 4.3 Interface between layer 3 and upper layer
• References