3GPP2 C.S0028-B Version 1.0 May 2011 TTY/TDD Minimum Performance Specification © 2011 3GPP2 3GPP2 and its Organizational Partners claim copyright in this document and individual Organizational Partners may copyright and issue documents or standards publications in individual Organizational Partner's name based on this document. Requests for reproduction of this document should be directed to the 3GPP2 Secretariat at [email protected]. Requests to reproduce individual Organizational Partner's documents should be directed to that Organizational Partner. See www.3gpp2.org for more information. 3GPP2 C.S0028-B v1.0 Revision History Revision Date C.S0028-0 v1.0 CDMA TTY/TDD Minimum Performance Specification May 2001 C.S0028-0 v2.0 CDMA TTY/TDD Minimum Performance Specification Dec. 2001 C.S0028-A v1.0 TTY/TDD Minimum Performance Specification Jan. 2004 C.S0028-B v1.0 TTY/TDD Minimum Performance Specification May 2011 3GPP2 C.S0028-B v1.0 Table of Contents 1 2 1 Introduction ............................................................................................................................................................1 3 1.1 Scope...............................................................................................................................................................1 4 1.2 Requirements Language..................................................................................................................................1 5 1.3 References.......................................................................................................................................................1 6 1.3.1 Normative References..............................................................................................................................1 7 1.3.2 Informative References ............................................................................................................................2 8 2 The Baudot Code....................................................................................................................................................3 9 3 Character Error Rate...............................................................................................................................................4 10 4 TTY/TDD Test Cases.............................................................................................................................................5 11 4.1 Interoperability with Reference TTY Vocoder ...............................................................................................5 12 4.2 Interoperability with Reference Non-TTY Capable Vocoder.........................................................................5 13 4.3 Input Level ......................................................................................................................................................5 14 4.4 Bit Duration.....................................................................................................................................................5 15 4.5 Stop Bit............................................................................................................................................................5 16 4.6 Phase Changes.................................................................................................................................................5 17 4.7 Frequency Deviations......................................................................................................................................5 18 4.8 Typing Mode...................................................................................................................................................5 19 4.9 Preamble..........................................................................................................................................................6 20 4.10 Mark Hold Tone ..........................................................................................................................................6 21 4.11 Voice Carryover/ Hearing Carryover (VCO/HCO).....................................................................................6 22 4.12 Tandem ........................................................................................................................................................6 23 4.13 Variable Rates..............................................................................................................................................6 24 4.14 Reduced Rate Modes ...................................................................................................................................6 25 4.15 False Alarms ................................................................................................................................................7 26 4.16 Slew .............................................................................................................................................................7 27 4.17 Impaired Channels.......................................................................................................................................7 28 4.18 Worst Case Deviations ................................................................................................................................7 29 5 Test Tools...............................................................................................................................................................8 30 5.1 ttygen...............................................................................................................................................................8 31 5.2 ttyrcv ...............................................................................................................................................................8 i 3GPP2 C.S0028-B v1.0 1 6 TTY/TDD Test Procedure......................................................................................................................................9 2 6.1 Description of Test Vectors.............................................................................................................................9 3 6.1.1 File Naming Convention..........................................................................................................................9 4 6.2 Baudot Parameter Variation Test ..................................................................................................................10 5 6.3 Interoperability Test ......................................................................................................................................14 6 6.4 Frame Error Handling Test ...........................................................................................................................14 7 6.5 Hard Handoff Test.........................................................................................................................................14 8 6.6 False Alarm Test ...........................................................................................................................................15 9 6.7 Tandem Test..................................................................................................................................................15 10 6.8 Half-Rate Max Test.......................................................................................................................................15 11 7 Requirements For Minimum Performance Compliance.......................................................................................17 12 7.1 Baudot Parameter Variation Test Requirements ...........................................................................................17 13 7.2 Interoperability Test Requirements ...............................................................................................................17 14 7.3 Frame Error Handling Test Requirements ....................................................................................................17 15 7.4 Hard Handoff Test Requirements .................................................................................................................17 16 7.5 False Alarm Test Requirements ....................................................................................................................17 17 7.6 Tandem Test Requirements...........................................................................................................................17 18 7.7 Half-Rate Max Test and Additional Requirements for EVRC-B, EVRC-WB, and EVRC-NW ..................18 19 ii 3GPP2 C.S0028-B v1.0 List of Tables 1 Table 6-1: Description of TTY PCM Test Vectors .....................................................................................................11 2 iii 3GPP2 C.S0028-B v1.0 1 FOREWORD 2 (This foreword is not part of this specification.) 3 This document specifies the minimum performance requirements and a test procedure for verifying solutions 4 for transporting the Baudot code over cdma2000 wireless networks using 3GPP2 13K Vocoder, EVRC, SMV, 5 EVRC-B, EVRC-WB, and EVRC-NW, corresponding to Service Options 17, 3, 56, 68, 70, and 73, 6 respectively iv 3GPP2 C.S0028-B v1.0 1 1 INTRODUCTION 2 1.1 Scope 3 Persons with hearing impairments or speech impediments are able to communicate over the telephone using 4 TTY/TDD (teletype/text telephone devices for the deaf), hereafter referred to as TTY devices. These devices 5 typically have