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• CCITT Rec. V.120 (11/1988) – SUPPORT BY AN ISDN OF DATA TERMINAL EQUIPMENT WITH V-SERIES TYPE INTERFACES WITH PROVISION FOR ...
• 1 Reference configurations
  • 1.1 Customer access configurations
  • 1.2 Connectivity
• 2 Data transport protocol specification
  • 2.1 Functions provided by protocol
  • 2.2 General terminal adaption
  • 2.3 General messages and formats
  • 2.4 Elements of procedure and procedures
  • 2.5 Data field length
  • 2.6 Control state information processing
  • 2.7 Parameter negotiation
• 3 Terminal adaptor (TA) functions
  • 3.1 Clock synchronization
  • 3.2 Data flow control and buffering
  • 3.3 Asynchronous mode operation
  • 3.4 Synchronous mode operation
  • 3.5 Bit transparent mode operation
• 4 Connection control procedures
  • 4.1 Establishment of circuit-switched connection
  • 4.2 Establishment of logical links
  • 4.3 Messages used for logical connection control
  • 4.4 Information elements
  • 4.5 Logical connection control procedures
• ANNEX A – Mappings of V.24 circuits to DR, SR, and RR
• A.1 DR-data ready (bit 7)
• A.2 SR-send ready (bit 6)
• A.3 RR-receive ready (bit 5)
• APPENDIX I – TE1 application
• I.1 Asynchronous mode operation
• I.2 Synchronous mode operation
• I.3 Bit transparent mode operation
• I.4 TE1 control state variable processing
• APPENDIX II – Clock synchronization
• APPENDIX III – Bearer channel initialization procedures for circuit switched applications