Preface
1 Introduction
  1.1 Requirements Terminology
  1.2 Requirement Labelling Conventions
2 Interface Requirements
  2.1 Overview
  2.2 Data Transmission Protocol
  2.3 Message Assembly Layer
  2.4 Data Link Layer
  2.5 Physical Layer
3 Maintenance
4 Performance
5 Limitations and Restrictions
References
Glossary
List of Figures
Figure 2-1 Data Transmission with Power Ringing
Figure 2-2 Data Transmission without Power Ringing
Figure 2-3 Off-Hook Data Transmission
Figure 2-4 DTMF Receiver Application: Successful Attempt
Figure 2-5 DTMF Receiver Application: Unsuccessful Attempt
Figure 2-6 Single Data Message Format
Figure 2-7 Multiple Data Message Format
Figure 2-8 Single and Multiple Data Message Frame Formats
List of Tables
Table 2-1 Off-Hook Parameter Values
Table 2-2 FSK Modulation Requirements
Table 2-3 CAS Characteristics