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• CCITT Rec. X.29 (11/1988) – PROCEDURES FOR THE EXCHANGE OF CONTROL INFORMATION AND USER DATA BETWEEN A PACKET ASSEMBLY/DISASSEMBLY (PAD) ...
• Preface
• 1 Procedures for the exchange of PAD control information and user data
  • 1.3 Call user data
  • 1.4 User sequences
  • 1.5 PAD messages
• 2 User data transfer
• 3 Procedures for the use of PAD messages
  • 3.1 Procedures for reading, setting, and reading and setting of PAD parameters
  • 3.2 Procedures for inviting the PAD to clear
  • 3.3 Interrupt and discard procedures
  • 3.4 Procedure for resets
  • 3.5 Error handling procedures by the PAD
  • 3.6 Procedures for inviting the PAD to reselect the called DTE
• 4 Formats
  • 4.1 Introduction
  • 4.2 Call user data format (see Figure 1/X.29)
  • 4.3 User sequence format
  • 4.4 Control message format
• ANNEX A – Characteristics of virtual calls and Recommendation X.25 as related to the PAD representation of a start-stop mode ...
• A.1 General interface characteristics
• A.2 Interface procedures for virtual call control
• A.3 Interface procedures for data transfer
• A.4 Virtual call characteristics