1 INTRODUCTION
1.1 Purpose
1.2 Definitions
1.3 Related Documents
1.4 Scope
2 SIGNALING PROTOCOL
2.1 Physical Layer
2.1.1 CPE Alerting Signal
2.1.2 Acknowledgment Signal
2.1.3 Received Data Signal Characteristics
2.2 Data Link Layer
2.3 Message Assembly Layer
2.3.1 Single Data Message Format
2.3.2 Multiple Data Message Format
2.3.3 Received Data Message Characteristics
2.3.4 Contents of Data Words
3 DATA TRANSMISSION
3.1 On-Hook Data Transmission Associated with
             Power Ringing
3.2 On-Hook Data Transmission Not Associated
             with Power Ringing
3.3 Off-Hook Data Transmission
3.3.1 SPCS-CPE Handshaking Sequence
3.3.2 Extension Phones
3.4 Other CPE Considerations
3.4.1 CPE Data Reception
3.4.2 Network Access Facilities
4 ERROR TREATMENT
5 NETWORK-TO-CPE SIGNAL DETECTION
6 CPE-TO-NETWORK SIGNAL GENERATION
7 DISPLAY
8 MEMORY REQUIREMENTS
9 USER INTERFACE
10 LIMITATIONS AND RESTRICTIONS
APPENDIX A
A.1 Introduction
A.2 Definitions
A.3 Testing Environment
A.4 Signal Recognition Tests Without Speech
A.5 Talkdown Tests
A.6 Talkoff Tests
APPENDIX B
B.1 Network Loop Loss Distribution
B.2 Tone Level Distribution for Tests
B.3 Measuring Speech Levels
B.4 Speech Levels in the Network
B.5 Speech Level Distributions for Tests
B.6 Talkdown Test Matrix
B.7 Talkoff Test Matrix
ACRONYMS LIST
REFERENCES
Figure 2-1 Single Data Message Format
Figure 2-2 Multiple Data Message Format
Figure 3-1 CPE Timing for Data Transmission Associated
             with Ringing
Figure 3-2 CPE Timings for Off-Hook Data Transmission
Figure 1 2750 Hz Loop Loss Distribution (1983 Survey)
Figure 2 Speech Level Distributions
Figure 3 Long-Term Spectrum of Artificial Voice
Figure 4 Talkdown Test Matrix
Figure 5 Talkoff Test Matrix