- ISBN: 9781587052699 | 1587052695
- Cover: Paperback
- Copyright: 6/11/2008
Master the basics of modems, fax, and text telephony technologies, including how modems and faxes work in an IP network infrastructure.
David Hanes, CCIE No. 3491, currently works as an engineer for the Cisco Customer Assurance Engineering (CAE) group based out of Research Triangle Park, North Carolina supporting various emerging technologies through product testing and field trials. In addition, David is a technical expert for Cisco in the area of fax over IP technologies and assists with network design and troubleshooting for critical fax over IP deployments. Since joining Cisco in 1997, he has worked as a Technical Assistance Center (TAC) engineer for the WAN, WAN Switching, and Multiservice Voice teams, a team lead for the Multiservice Voice team, and an Escalation Engineer covering a variety of voice and fax technologies. David has troubleshot escalated issues in Cisco customer networks worldwide and remains a technical resource for other Cisco employees and customers. Before working at Cisco, David was a Systems Engineer for Sprint, where he gained his first computer networking experience working on the Frame Relay and X.25 protocols. He holds a bachelor of science degree in electrical engineering from North Carolina State University.
Gonzalo Salgueiro, CCIE No. 4541, is a senior engineer for the Unified Communications Infrastructure Escalation team of the Technical Assistance Center (TAC) in Research Triangle Park, North Carolina. In his current role, he is a technical leader for fax and voice over IP technologies working directly with Cisco development engineering, TAC support teams, and product serviceability organization, providing support for various Unified Communications products and technologies. Over the past 12 years at Cisco, he has specialized in troubleshooting complex issues for some of the largest VoIP networks and has provided technical leadership for some of the most critical worldwide voice and fax deployments. Before joining the Escalation team in 1999, Gonzalo had roles as a TAC engineer for both the Access/Dial and Multiservice Voice teams and as a team lead for the Access/Dial team. Gonzalo has developed and delivered all levels of training and documentation on these technologies both internally to Cisco technical teams and externally to Cisco customers worldwide. He holds a bachelor of science degree in physics from Jacksonville University and a master of science degree in physics from the University of Miami.
| Introduction | p. xxiii |
| Laying the Groundwork | p. 3 |
| How Modems Work | p. 5 |
| A Brief History of Modems | p. 5 |
| Modem Architecture | p. 8 |
| Modem Types | p. 10 |
| External Versus Internal Modems | p. 10 |
| Hardware Versus Software Modems | p. 10 |
| Fax Modems | p. 12 |
| Terminal-to-Modem Communication | p. 14 |
| DTE and DCE | p. 15 |
| RS-232 Signaling | p. 15 |
| Asynchronous Framing | p. 19 |
| User Interface | p. 20 |
| Modem-to-Modem Communication | p. 26 |
| Modulation | p. 26 |
| Frequency Shift Keying (FSK) | p. 28 |
| Phase Shift Keying (PSK) | p. 29 |
| Amplitude Modulation (AM) | p. 30 |
| Quadrature Amplitude Modulation (QAM) | p. 31 |
| Trellis Coded Modulation (TCM) | p. 32 |
| Modulation Standards | p. 33 |
| Modem Call Analysis | p. 34 |
| Call Setup | p. 35 |
| Network Interaction | p. 36 |
| Probing/Ranging | p. 38 |
| Equalizer and Echo Canceller Training | p. 40 |
| Final Training | p. 41 |
| Data Mode | p. 42 |
| Retrains and Speedshifts | p. 42 |
| Error Control | p. 45 |
| Data Compression | p. 48 |
| Call Disconnect | p. 49 |
| Summary | p. 51 |
| How Fax Works | p. 53 |
| A Brief History of Fax | p. 54 |
| Fax Components | p. 56 |
| Group Classifications | p. 57 |
| Specifications and Standards | p. 58 |
| Fax Modulations | p. 59 |
| Fax Messaging | p. 61 |
| Phases of a Fax Call | p. 62 |
| Message Format Overview | p. 63 |
| Analyzing a Basic Fax Call | p. 65 |
| CNG Tone | p. 66 |
| CED Tone | p. 67 |
| DIS, NSF, and CSI Messages | p. 68 |
| DCS and TSI Messages | p. 71 |
| TCF, CFR, and FTT Messages | p. 73 |
| MPS, EOP, EOM, MCF, RTP, RTN, and DCN Messages | p. 75 |
| Other T.30 Messages | p. 77 |
| Understanding Error Correction Mode | p. 81 |
| ECM Call Analysis | p. 82 |
| PPS and PPR | p. 84 |
| Important G3 Timers | p. 86 |
| Super G3 Faxing | p. 88 |
| Comparison of SG3 and G3 | p. 89 |
| Super G3 Call Analysis | p. 89 |
| Page Encoding | p. 91 |
| Modified Huffman | p. 92 |
| Modified READ | p. 97 |
| Modified Modified READ | p. 103 |
| Summary | p. 105 |
| How Text Telephony Works | p. 107 |
| A Brief History of Text Telephony | p. 107 |
| Text Telephone Terminology | p. 110 |
| Standards and Specifications | p. 110 |
| Carrier Based Versus Carrierless Protocols | p. 111 |
| ITU-T Recommendation V.18 | p. 112 |
| Text Telephone Operation | p. 112 |
| Acoustic Coupling Versus Direct Connections | p. 113 |
| Originating and Receiving Text Telephone Calls | p. 114 |
| Conversation Conventions | p. 116 |
| Text Telephone Relay Services | p. 118 |
| HCO (Hearing Carry Over) | p. 119 |
| VCO (Voice Carry Over) | p. 120 |
| Baudot Protocol | p. 121 |
| Baudot Character Set | p. 121 |
| Baudot Modulation Details | p. 123 |
| Summary | p. 124 |
| IP Solutions and Design | p. 127 |
| Passthrough | p. 129 |
| Passthrough Fundamentals | p. 130 |
| NSE-Based Passthrough | p. 137 |
| Fax Passthrough with NSE | p. 139 |
| Modem Passthrough with NSE | p. 141 |
| Protocol-Based Pass-Through for Fax | p. 143 |
| Fax Pass-Through with H.323 Signaling | p. 144 |
| Fax Pass-Through with SIP Signaling | p. 145 |
| Text over G.711 | p. 146 |
| A Future Look at ITU-T V.152 | p. 147 |
| Summary | p. 148 |
| Relay | p. 151 |
| Relay Fundamentals | p. 151 |
| Fax Relay | p. 154 |
| T.38 Fax Relay | p. 155 |
| NSE-Based Switchover for T.38 | p. 167 |
| Protocol-Based Switchover for T.38 | p. 169 |
| Cisco Fax Relay | p. 173 |
| Modem Relay | p. 175 |
| Cisco Text Relay | p. 181 |
| A Future Look at ITU-T T.38, V.150.1, and V.151 | p. 185 |
| Summary | p. 185 |
| T.37 Store-and-Forward Fax | p. 189 |
| Overview of T.37 Store-and-Forward Fax | p. 189 |
| SMTP Overview | p. 191 |
| SMTP Commands and Sample Sessions | p. 192 |
| DSN and MDN | p. 195 |
| T.37 Onramp | p. 201 |
| T.37 Offramp | p. 203 |
| Summary | p. 204 |
| Design Guide for Fax, Modem, and Text | p. 207 |
| General Passthrough and Relay Design Considerations | p. 208 |
| Bandwidth | p. 209 |
| Call Control Protocol | p. 214 |
| QoS | p. 215 |
| Redundancy | p. 221 |
| Resource Utilization | p. 224 |
| Table of Contents provided by Publisher. All Rights Reserved. |
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