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• ITU-T RECOMMENDATION I.121 (1988)
• 1 Principles and concept
  • 1.1 Principles of B-ISDN
  • 1.2 Evolution of B-ISDN
• 2 Service aspects of B-ISDN
  • 2.1 General
  • 2.2 Service classes
  • 2.3 Definition of service classes
  • 2.4 Examples of broadband services
  • 2.5 User-network interface from the service point of view
• 3 Architecture models
  • 3.1 Functional architecture
  • 3.2 Basic architectural model
  • 3.3 Reference configurations
  • 3.4 B-ISDN protocol model for ATM
• 4 Asynchronous transfer mode characteristics
  • 4.1 General considerations
  • 4.2 Header functions
  • 4.3 Header format
  • 4.4 Header size
  • 4.5 Information field size
• 5 Broadband channel rates
• 6 User-network interface (UNI)
  • 6.1 General
  • 6.2 Structure of 150 Mbit/s UNI
  • 6.3 Structure of 600 Mbit/s UNI
  • 6.4 Physical and functional characteristics
• 7 Network aspects
  • 7.1 Generalities
  • 7.2 Transmission of ATM
  • 7.3 Synchronization
  • 7.4 Signalling
  • 7.5 Traffic management and usage monitoring
• 8 Adaptation between ATM and non-ATM parts of the ISDN
• ANNEX A - Examples of broadband services
• ANNEX B - Definitions of possible broadband service families and their attribute values
• B.1 broadband unrestricted bearer services
• B.2 high quality broadband videotelephony services
• B.3 high quality broadband videoconference services
• B.4 high definition TV and existing quality TV distribution services
• B.5 broadband videotex services