Wavecom W-SPECTRA (Automatic Monitoring System) V1.1.0 Manuel d'utilisateur Page 65
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WAVECOM Monitoring System W-SPECTRA, W-SPEED Manual V1.1.0 Transmission Modes
55
ACARS Frame
Parameter
Value
Pre-key
16 characters All binary “ones”
Bit Sync
2 characters “+” , “*”
Character Sync
2 characters SYN, SYN (0x16)
Start of Heading
1 character SOH (0x01)
Mode
1 character
Address
7 characters
Technical Acknowledgement
1 character
Label
2 characters
Block Identifier
1 character
Start of Text
1 character
STX (0x02) - if no text ETX (0x03)
Text
220 characters maximum, printable characters only
Suffix
1 character, if single or terminal block ETX, else ETB (0x17)
Block Check Sequence 16 bits
BCS Suffix 1 character DEL (0x7F)
Messages may be single or multi-block. The pre-key sequence and the BCS have no parity bits.
ACARS communications are divided in Category A and Category B.
Using Category A, an aircraft may broadcast its messages to all ground stations. This is denoted by an
ASCII "2" in the Mode field of the downlink message. The WAVECOM software translates this character to
"A".
Using Category B an aircraft transmits its message to a single ground station. This is denoted by an ASCII
character in the range "@" to "]" in the Mode field of the downlink message.
The ground station may use either "2" or the range "‘" to "}" in the Mode field. All ground stations support
Category A, but may uplink "‘" to "}" in the Mode field.
The WAVECOM software translates the ground station address (also called the Logical Channel Number)
into a number in the range 0...29.
A station will transmit after having monitored the HF channel for traffic, otherwise it waits until the chan-
nel is clear. If a collision occurs between the packets of two stations transmitting at the same time, they
will back-off and new transmission intervals will be set by random interval timers in the radio equipment.
At the receiving end, a block check calculation is made and compared to the calculation appended to the
packet by the transmitting station. If the downlink messages contain errors, no response will be given and
the transmitting station will retransmit the packet a number of times, until a positive acknowledgement is
received and the message can be deleted from storage, or the aircrew be alerted to its non-transmission.
If an uplink message is found in error, the airborne equipment will generate a negative acknowledgement
(NAK), which triggers an uplink retransmission. Retransmission is also triggered by timeout.
Positive acknowledgement from the aircraft consists of the transmission of the Uplink Block Identifier of
the correctly received block. Positive acknowledgement from the ground station consists of a similar
transmission of the Downlink Block Identifier.
Acknowledgements are placed in the Technical Acknowledgement field.
The general response message label is "_DEL" (0x5F or 0x7F). Messages with this label contain no infor-
mation except acknowledgements and are used for link maintenance.
The traffic exchanged can be requests for voice communication, weather reports, access to airline com-
puter systems, reading of aircraft automatic sensors, flight plans, messages to be routed to destinations in
- W-SPECTRA, W-SPEED 1
- Manual V1.1.0 1
- Contents 3
- Parameters and Options 42 4
- Transmission Modes 54 4
- SAT System 219 7
- Modem and FAX Modes 230 7
- WAVECOM Data Formats 240 8
- Appendix 253 8
- Glossary of Terms 269 8
- Index 279 8
- General Information 12
- W-Sat-email-Decoder 13
- Introduction 14
- W-SPEED 16
- W-SPECTRA Server 19
- W-SPECTRA Licensing 20
- W-SPECTRA License Checking 21
- Software Uninstall 22
- System W-SPECTRA 23
- Main Menu 26
- File Menu 28
- Run Menu 28
- Configuration Menu 29
- Tools Menu 30
- Help Menu 32
- License 33
- WAVECOM on the Web 33
- About W-SPECTRA 33
- The Operation Tab 34
- User Configurable Database 39
- Three Operation Modes 40
- Spectrum Editing Tool (W 47
- Select a Signal and Playback 49
- Split a Recording 50
- Convert a Recording 51
- Parameters and Options 52
- Bit Inversion Mask 53
- CRC Recognition 53
- CRC Table 53
- Clear Screen 53
- Frame Format… 54
- Letters/Figures 54
- Resync Mode 55
- SAT Settings… 55
- Timestamp 56
- Modulation 57
- Frequency Offset 60
- NB FFT Gain 60
- Custom Alphabets 60
- Passband Filter Support 62
- Transmission Modes 64
- ALE-400 67
- ALF-RDS 68
- AMSAT-P3D 70
- APCO-25 70
- ARQ6-90 and ARQ6-98 71
- ARQ-M2-342 and ARQ-M2-242 73
- ARQ-M4-342 and ARQ-M4-242 73
- AUTOSPEC 76
- BR-6028 81
- BULG-ASCII 82
- CHINESE 4+4 85
- CIS-36-50 88
- CIS-50-50 89
- CLOVER-2 89
- CLOVER-2000 90
- CLOVER-2500 91
- CODAN-SELCAL 91
- CODAN-9001 91
- COQUELET-13 95
- COQUELET-8 96
- COQUELET-80 97
- CW-MORSE 99
- DCS SELCAL 100
- DUP-ARQ 104
- DUP-ARQ-2 105
- DUP-FEC-2 105
- FELDHELL 112
- FM-HELL 113
- FMS-BOS 114
- GMDSS/DSC-HF 116
- GMDSS/DSC-VHF 116
- GOLAY/GSC 117
- GW-OFDM 119
- Decoder 120
- HF-ACARS 122
- HNG-FEC 123
- ICAO SELCAL 124
- LINK-11 (CLEW) 125
- MD-674 ASYNC 126
- METEOSAT 126
- MFSK-20 127
- MFSK-8 and MFSK-16 128
- MIL-188-110A 130
- MIL-188-110A-MOD 132
- Data Block – 256 symbols 134
- Mini-probe – 31 symbols 134
- MIL-188-141A 135
- MIL-188-141B (Appendix C) 136
- MIL-M-55529A NB/WB 137
- MOBITEX-1200 138
- MOBITEX-8000 139
- Fax & MODEMS Half-Duplex 140
- FAX-G3-V.29 141
- FAX-G3-V34hdx 141
- V.21, BELL103 141
- V.22 / V.22bis, BELL212A 141
- FAX & MODEMS Full-Duplex 142
- MPT-1327 143
- NMT-450 146
- NOAA-GEOSAT 146
- NWR-SAME 147
- ORBCOMM 152
- PACKET-1200 153
- PACKET-300 154
- PACKET-9600 154
- PACTOR-FEC 156
- PACTOR-II 157
- PACTOR-II-AUTO 158
- PACTOR-II-FEC 158
- PACTOR-III 159
- PICCOLO-MK6 and PICCOLO-MK12 162
- POL-ARQ 165
- PRESS-FAX 165
- PSK-31-FEC 167
- PSK-63F, PSK-125F, PSK-220F 168
- ROBUST-PACKET 170
- RUM-FEC 171
- SAT-AERO 172
- SAT-B-C-TFC 173
- SAT-B-C-HSD 174
- SAT-C TDM 175
- SAT-C-TDMA 176
- SAT-C-TDM-EGC 177
- Inmarsat Utilities 178
- SAT-MINI-M 179
- SAT-MINI-M-C-HSD 180
- SI-AUTO 181
- SITOR-ARQ 182
- SITOR-AUTO 183
- SITOR-FEC 183
- STANAG-4285 187
- Block 1 Block 2 Block 3 188
- T = 106.66 ms 188
- 33.33 ms 188
- STANAG-4481-FSK 190
- STANAG-4481-PSK 191
- STANAG-4529 192
- T = 213.33 ms 193
- Preamble 193
- STANAG-4539 194
- STANAG-5065-FSK 194
- SWED-ARQ 194
- Constraints 198
- THROB and THROBX 199
- TWINPLEX 200
- WEATHER-FAX 203
- ZVEI-VDEW 207
- SPECTRA 210
- Classification Results List 211
- Classifier Parameters 212
- Caveats 213
- User Interface 218
- Code Check Settings 220
- Classifier Code Check Editor 221
- CCC Editor GUI 222
- Edit Menu 223
- Database Fields 226
- SAT System 229
- Systems 230
- RF Channels 231
- Logical Channels 231
- SAT Operation 232
- The Sat Aero System 234
- Channel types 235
- GES Initiated Session 236
- AES Initiated Session 236
- Trouble Shooting 236
- Session Success (Fax) 237
- SAT-C-TDM, SAT-C-TDMA 237
- Modem and FAX Modes 240
- Fax and Data Transmission 241
- Handshaking 242
- Modulation Types 243
- Decoding 244
- Input and interfacing 246
- Options 248
- Select “Help” from the menu 249
- WAVECOM Data Formats 250
- APPLICATION NOTES 251
- DEFINITION OF CHUNKS 252
- WAVECOM Data File Format 254
- Text data 255
- SAT data 256
- Classifier data 256
- ClassifierCodeCheck data 257
- Graphics data 258
- FELDHELL data 259
- Sonagram data 259
- 4096 Bytes 16 Bytes 260
- FFTSamples Time 260
- 12 Bytes n Bytes 260
- DataHeader Data 260
- SigAnal data 261
- Appendix 263
- ITA-2 Alphabet 264
- ITA-3-Alphabet 265
- ITA-4 Alphabet 266
- ITA-5 Alphabet 267
- SITOR Alphabet 271
- ITA-1 Alphabet 272
- Questions & Answers 273
- Signal Interference 273
- Conditions of Sale 274
- License Terms 276
- Manufacturer Address 277
- Glossary of Terms 279
- WINDOWS 288
- Word-wrap 288
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