• 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