Preface
1 Introduction
      1.1 Transaction Language 1 (TL1)
      1.2 Organization of Document
      1.3 TL1 Historical Perspective
      1.4 Requirements Terminology
      1.5 Requirement Labeling Conventions
      1.6 Requirements Statement
2 TL1 Message Specification
      2.1 TL1 General Message Syntax
              2.1.1 Input versus Output
      2.2 Characters and Information Units
              2.2.1 Identifiers
              2.2.2 Symbolic Names
              2.2.3 Decimal Numbers
              2.2.4 Nondecimal Numbers
              2.2.5 Text Strings
              2.2.6 Arithmetic Expressions
              2.2.7 Keyed Numbers
              2.2.8 Numeric String
              2.2.9 Integer
              2.2.10 Inner String
      2.3 Parameter Block Syntax
              2.3.1 Position-Defined Parameters
              2.3.2 Name-Defined Parameters
              2.3.3 Name/Position Syntax Conflicts
      2.4 Boolean Flag Parameters
      2.5 Defining a Parameter Block
              2.5.1 Parameter Specification
              2.5.2 Block Type Selection
      2.6 Defining Parameter Values
              2.6.1 Compound Arguments
              2.6.2 Grouping of Arguments
      2.7 Implementation Issues
              2.7.1 Correction Characters and Comments
              2.7.2 Restrictions on Nondecimal Numbers and
                        Arithmetic Expressions
              2.7.3 Case Sensitivity
                        2.7.3.1 Command Codes and Parameter Names
                        2.7.3.2 Parameter Values
              2.7.4 Resolving the Increment Ambiguity
3 Input Command Message Structure
      3.1 General Format
      3.2 Command Code
              3.2.1 Verb
              3.2.2 Modifiers
      3.3 Staging Parameter Blocks
              3.3.1 Target Identifier (TID) Block
              3.3.2 Access Identifier (AID) Block
                        3.3.2.1 Circuit and Equipment Access
                        3.3.2.2 Administrative View Access
                        3.3.2.3 Access by Alias Values
                        3.3.2.4 Object Identifier Context Switching
              3.3.3 Correlation Tag (CTAG) Block
              3.3.4 General Block (GB)
                        3.3.4.1 Delay Activation
                        3.3.4.2 Contingency Flag
                        3.3.4.3 Indirect Data Retrieval Indicator
      3.4 Message Payload
              3.4.1 IntraBlock Type Procedure
4 Acknowledgements
      4.1 General Format
      4.2 In Progress (IP) and Printout Follows (PF)
      4.3 All Right (OK)
      4.4 No Acknowledgment (NA)
      4.5 No Good (NG)
      4.6 Repeat Later (RL)
5 Output Response Message Structure
      5.1 General Format
      5.2 Header
      5.3 Response Identification
      5.4 Text Block
      5.5 Terminator
      5.6 Examples of Output Response Message
6 Autonomous Messages
      6.1 General Format
      6.2 Header (