Content for TS 26.226 Word version: 18.0.0
2 References
3 Definitions and Abbreviations
3.1 Definitions
3.2 Abbreviations
4 General
5 The problem
5.1 US regulatory issues
6 The goals and objectives
7 Text Telephony architecture based upon CTM
7.1 Text Telephone devices
7.2 Error resilient transmission in the speech path
7.3 Interworking with traditional Text Telephone devices
8 Technical description of CTM
8.1 Overview
8.2 CTM transmitter
8.3 CTM receiver
9 CTM negotiation and inband signaling
9.1 Definition of control characters
9.2 CTM availability negotiation
10 Functions in the CTM environment
10.1 CTM to CTM communication
10.2 CTM between the mobile side and a gateway
10.3 CTM within the transcoding equipment
10.4 Cascading of CTM adapters in the speech path
10.5 Rerouting of a call from a CTM supported environment to a non-supported environment
A CTM Receiver
A.1 Demodulator
A.2 Synchronization and de-interleaver
A.3 Puncture and resynchronization
A.4 FEC error correction
$ Change history
2 References p. 5
3 Definitions and Abbreviations p. 5
3.1 Definitions p. 5
3.2 Abbreviations p. 6
4 General p. 6
5 The problem p. 6
6 The goals and objectives p. 7
7 Text Telephony architecture based upon CTM p. 7
7.1 Text Telephone devices p. 9
7.2 Error resilient transmission in the speech path p. 9
7.3 Interworking with traditional Text Telephone devices p. 9
8 Technical description of CTM p. 10
8.1 Overview p. 10
8.2 CTM transmitter p. 10
8.2.1 Character set p. 10
8.2.2 FEC error protection p. 10
8.2.3 CTM burst structure p. 11
8.2.4 Periodic muting and insertion of resynchronization sequence p. 12
8.2.5 Interleaver and synchronization preamble p. 15
8.2.6 CTM modulator p. 16
8.2.7 Switching between speech and data p. 17
8.3 CTM receiver p. 17
9 CTM negotiation and inband signaling p. 17
10 Functions in the CTM environment p. 18
10.1 CTM to CTM communication p. 18
10.2 CTM between the mobile side and a gateway p. 19
10.3 CTM within the transcoding equipment p. 19
10.4 Cascading of CTM adapters in the speech path p. 19
10.5 Rerouting of a call from a CTM supported environment to a non-supported environment p. 19
A CTM Receiver p. 21
A.1 Demodulator p. 21
A.2 Synchronization and de-interleaver p. 21
A.3 Puncture and resynchronization p. 22
A.4 FEC error correction p. 22
$ Change history p. 23
