Comtech EF Data SDM-309B Specifications Page 39
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Operation SDM-309B Satellite Modem
3β8 MN/U-SDM309B Rev. #
3.1.4.3 Interface Configuration
TX_clock Programs the clock source for the modem transmitter clock. βInternalβ sets
the TX clock to operate from the modem internal clock, this is also the
fallback clock. βExternalβ sets the TX clock to operate from the external
reference clock. This clock must be frequency locked to the data that is
being transmitted. βTX Terrestrialβ sets the TX clock to recover timing from
the incoming data.
On entry the current transmit clock setting is displayed with the flashing
cursor on the first character. Use the arrow keys to select βInternalβ,
βExternal Referenceβ, or TX Terrestrialβ clock. Press the βENTERβ key to
execute the change.
BUF_Clk Programs the interface plesiochronous buffer output clock. βTX Terrestrialβ
sets the buffer output clock to recover timing from the incoming TX data
clock. βExternalβ sets this clock source to the external reference clock.
βsatelliteβ sets the output buffer clock to the satellite clock, this is also the
fallback clock. If βsatelliteβ is selected, the doppler shift caused by the
satellite will not be removed. βInternalβ set the buffer clock to operate from
the modem internal clock.
On entry the current setting of the plesiochronous buffer clock is displayed
with the flashing cursor on the first character. Use the arrow keys to select
βsatelliteβ, βInternalβ, βExt Refβ, or βTX_Terrβ for the buffer clock. Press the
βENTERβ key to execute the change.
RX_Clock Programs the RX clock to βNormalβ or βInvertedβ.
On entry the current status of the RX Clock is displayed with the flashing
cursor on the first character. Use the arrow keys to select βNormalβ or
βInvertedβ. Press the βENTERβ key to execute the change.
Ext_REF Program the external reference clock input frequency between 8 KHz and
10 MHz in 8 KHz Steps.
On entry the current setting for the external reference is displayed with the
flashing cursor on the first character. Use the right and left arrow keys to
move the flashing cursor and the up and down arrow keys to increment or
decrement the digit at the flashing cursor. Press the βENTERβ key to
execute the change.
BBLoopBk *Programs the modem for baseband loopback operation. When baseband
loopback is turned on data is looped back on the customer side of the
interface. This is a bidirectional loopback of the baseband data. See Figure
3-10 for a block diagram of baseband loopback operation.
On entry the current status is displayed with the flashing cursor on the first
character. Use the arrow keys to select ON or OFF. Press the βENTERβ key
to execute the change.
INTF_LBk *Programs the modem for interface loopback operation. When interface
loop-back is turned on data is looped back on the modem side of the
interface. This is a bidirectional loopback of the data after the baseband
data has had the 16/15 overhead added. See Figure 3-11 for a block
diagram of interface loopback operation.
On entry the current status is displayed with the flashing cursor on the first
character. Use the arrow keys to select ON or OFF. Press the βENTERβ key
to execute the change.
- SDM-309B 1
- SDM-309BSDM-309B 1
- Warranty Policy 3
- Limitations of Warranty 3
- Exclusive Remedies 3
- Disclaimer 3
- About this Manual 4
- Cautions and Warnings 4
- Metric Conversion 4
- Trademarks 5
- Customer Support 6
- Table of Contents 8
- Rev. 0 vii 10
- Rev. 0 ix 12
- Chapter 1 14
- INTRODUCTION 14
- 1-1β2 MN/U-SDM309B Rev. # 15
- Figure 1-1 SDM-309B Modem 16
- 1-1β4 MN/U-SDM309B Rev. # 17
- MN/U-SDM309B Rev. # 1-1β5 18
- 1-1β6 MN/U-SDM309B Rev. # 19
- 1.4 System Specification 20
- 1-1β10 MN/U-SDM309B Rev. # 23
- MN/U-SDM309B Rev. # 1-1β11 24
- 1-1β12 MN/U-SDM309B Rev. # 25
- Chapter 2 26
- INSTALLATION 26
- Figure 2-1 Rear Panel View 28
- 2.2.1 Data I/O 29
- 2.2.2 Remote (J6) 29
- 2.2.3 Fault (J7) 29
- 2.2.4 IF Output (CP1) 30
- 2.2.5 IF Input (CP2) 30
- 2.2.6 AC Power 30
- 2.2.7 GND 30
- 2.3 System Requirements 30
- 2.4 System Installation 31
- Chapter 3 32
- OPERATION 32
- 3.1.3 Front Panel Controls 33
- Figure 3-1 Front Panel View 34
- 3.1.4 Configuration 35
- 3.1.4.1 MOD Configuration 35
- 3.1.4.2 DEMOD Configuration 36
- 3.1.5 Monitor 41
- 3.1.6 Faults 41
- 3.1.7 Stored Faults 43
- 3.1.8 Utility 43
- Figure 3-2 Menu Tree 47
- Figure 3-3 Menu Tree 48
- Figure 3-4 Menu Tree 49
- Figure 3-5 Menu Tree 50
- Figure 3-6 Menu Tree 51
- Figure 3-7 Menu Tree 52
- Figure 3-8 IF Loopback 53
- Figure 3-9 RF Loopback 54
- 3β24 MN/U-SDM309B Rev. # 55
- MN/U-SDM309B Rev. # 3β25 56
- 3.2.1 General 57
- 3.2.2 Configuration 57
- 3.2.2.1 MOD Configuration 58
- 3.2.2.2 DEMOD Configuration 59
- 3.2.3 Monitor 65
- 3.2.4 Faults 66
- 3.2.5 Stored Faults 67
- 3.2.6 Utility 68
- Figure 3-12 Menu Tree 71
- Figure 3-13 Menu Tree 72
- Figure 3-14 Menu Tree 73
- Figure 3-15 Menu Tree 74
- Figure 3-16 Menu Tree 75
- Figure 3-17 Menu Tree 76
- 3β46 MN/U-SDM309B Rev. # 77
- Chapter 4 78
- M&C AND INTERFACES 78
- Connect JP7 to RS232 79
- MN/U-SDM309B Rev. # 4-4β3 80
- 4.1.2.2 Remote Baud Rate 81
- 4.1.2.3 Remote Address 81
- 4.1.2.4 Battery 81
- 4.1.2.8 Utility Defaults 83
- 4.2 Digital Interfaces 83
- 4.2.1 IBS/M1200P Interface 84
- 4.2.1.2 Data Interface 84
- 4.2.1.3 Transmit Multiplexer 84
- 4-4β8 MN/U-SDM309B Rev. # 85
- MN/U-SDM309B Rev. # 4-4β9 86
- 4-4β10 MN/U-SDM309B Rev. # 87
- Figure 4-4 IBS Fault Tree 88
- Figure 4-5 Jumper Table 89
- 4.2.1.4 Receive Multiplexer 90
- 4-4β18 MN/U-SDM309B Rev. # 95
- 4.2.1.9.7 Send Data (J7) 98
- 4.2.1.9.8 Receive Data (J8) 99
- MN/U-SDM309B Rev. # 4-4β23 100
- 4-4β24 MN/U-SDM309B Rev. # 101
- 4.2.2.2 Data Interface 102
- 4.2.2.3 Transmit Multiplexer 102
- 4.2.2.7 Backward Alarm 103
- MN/U-SDM309B Rev. # 4-4β27 104
- 4-4β28 MN/U-SDM309B Rev. # 105
- MN/U-SDM309B Rev. # 4-4β29 106
- 4-4β30 MN/U-SDM309B Rev. # 107
- MN/U-SDM309B Rev. # 4-4β31 108
- MN/U-SDM309B Rev. # 4-4β35 112
- 4.2.2.10.11 Faults (J11) 115
- 4.2.2.11 Rear Panel Switches 116
- 4.2.2.11.1 Drop Data Input 116
- 4.2.2.11.2 Drop Data Output 116
- 4.2.2.11.3 Insert Data Input 116
- 4-4β40 MN/U-SDM309B Rev. # 117
- MN/U-SDM309B Rev. # 4-4β41 118
- Table 4-3 119
- MN/U-SDM309B Rev. # 4-4β43 120
- 4-4β44 MN/U-SDM309B Rev. # 121
- 4.3.1 Master/Slave 122
- 4.3.1.2 Master/Slave G.703 123
- 4.3.1.3 Master/Slave X.21 123
- 4.3.2 Master/Master 123
- Chapter 5 125
- THEORY OF OPERATION 125
- Figure 5-1 Modulator Card 127
- 5-5β4 MN/U-SDM309B Rev. # 128
- MN/U-SDM309B Rev. # 5-5β5 129
- 5.1.3 Theory of Operation 130
- 5.2.1 General Description 131
- MN/U-SDM309B Rev. # 5-5β9 133
- 5-5β10 MN/U-SDM309B Rev. # 134
- MN/U-SDM309B Rev. # 5-5β11 135
- 5-5β12 MN/U-SDM309B Rev. # 136
- MN/U-SDM309B Rev. # 5-5β13 137
- 5.2.3 Theory Of Operation 138
- 5.2.3.1 Demod Processor 138
- 5.2.3.2 Viterbi Decoder 138
- 5.3 Demodulator 139
- 5.3.1 General Description 139
- 5.3.2 Specifications 140
- Figure 5-9 Demodulator Card 141
- 5-5β18 MN/U-SDM309B Rev. # 142
- 5.3.3 Theory of Operation 143
- 5.4.1 General 143
- 5.4.2 Reacquisition 144
- 5.4.3 Fast Acquisition 145
- 5.4.4 Directed Sweep 145
- Chapter 6 146
- MAINTENANCE 146
- 6-6β2 MN/U-SDM309B Rev. # 147
- MN/U-SDM309B Rev. # 6-6β3 148
- 6-6β4 MN/U-SDM309B Rev. # 149
- Table 6-1 150
- 6-6β6 MN/U-SDM309B Rev. # 151
- MN/U-SDM309B Rev. # 6-6β7 152
- 6.1.4 Test Points 153
- Figure 6-6 154
- Figure 6-7 155
- Figure 6-8 156
- Figure 6-9 157
- 6.2 Fault Isolation 158
- 6.2.1 Modulator Faults 158
- 6.2.2 Demodulator Faults 159
- Table 6-2 162
- 6-6β18 MN/U-SDM309B Rev. # 163
- MN/U-SDM309B Rev. # 6-6β19 164
- 6-6β20 MN/U-SDM309B Rev. # 165
- MN/U-SDM309B Rev. # 6-6β21 166
- 6.4 Module Replacement 167
- 6.5 Module Identification 167
- 6.6 Repacking For Shipment 167
- Table 6-3 168
- Appendix A 169
- DATA RATES AND FILTERS 169
- 1.2 Variable Rate Filters 170
- MN/U-SDM309B Rev. # Aβ3 171
- Aβ4 MN/U-SDM309B Rev. # 172
- MN/U-SDM309B Rev. # Aβ5 173
- Aβ6 MN/U-SDM309B Rev. # 174
- MN/U-SDM309B Rev. # Aβ7 175
- Aβ8 MN/U-SDM309B Rev. # 176
- MN/U-SDM309B Rev. # Aβ9 177
- Appendix B 178
- SATELLITE MODEM REMOTE 178
- 3.4 End Character 179
- 3.1 Start Character 179
- 3.2 Device Address 179
- 3.3 Command/Responses 179
- 4.2.2 Demodulator Rate 183
- 4.2.4 RF Loop-back (ON/OFF) 184
- 4.2.5 IF Loop-back (ON/OFF) 184
- 4.2.7 Sweep Reacquisition 185
- 4.2.8 Fast Acquisition Mode 185
- 4.2.9 Sweep Center Frequency 185
- 4.2.10 Sweep Width Range 186
- 4.2.11 Sweep Direction 186
- 4.3.12 Interface Buffer Size 188
- 4.3.13 Transmit Data Fault 189
- 4.3.14 Receive Data Fault 189
- 4.3.15 Drop Data Format 189
- 4.3.16 Insert Data Format 189
- 4.4.1 Time Of Day 191
- 4.4.2 Date 191
- 5.3 Modulator Status 195
- 5.4 Demodulator Status 195
- 5.5 Common Equipment Status 196
- 5.8 Bit Error Rate Status 197
- 5.8.1 Raw BER 197
- 5.8.2 Corrected BER 197
- 5.8.3 Corrected BER Log 197
- 5.9 Eb/N0 Status 198
- 5.10 Modulator Rate Status 198
- 5.11 Demodulator Rate Status 198
- 5.13 Current Sweep Value 199
- 5.16 Stored Faults 199
- MN/U-SDM309B Rev. # B-Bβ23 200
- B-Bβ28 MN/U-SDM309B Rev. # 205
- 5.20 Change Status 206
- 5.21 Equipment Type 206
- B-Bβ30 MN/U-SDM309B Rev. # 207
- Appendix C 208
- EXTERNAL CHANNEL UNIT 208
- C-Cβ2 MN/U-SDM309B Rev. # 209
- MN/U-SDM309B Rev. # C-Cβ3 210
- C-Cβ4 MN/U-SDM309B Rev. # 211
- MN/U-SDM309B Rev. # C-Cβ5 212
- C-Cβ6 MN/U-SDM309B Rev. # 213
- MN/U-SDM309B Rev. # C-Cβ7 214
- C-Cβ8 MN/U-SDM309B Rev. # 215
- MN/U-SDM309B Rev. # C-Cβ9 216
- C-Cβ10 MN/U-SDM309B Rev. # 217
- 2.0 Digital Interfaces 218
- 2.1.1 Functional Description 218
- C-Cβ12 MN/U-SDM309B Rev. # 219
- MN/U-SDM309B Rev. # C-Cβ13 220
- C-Cβ14 MN/U-SDM309B Rev. # 221
- 2.1.2 Connector Pinouts 223
- 2.1.3 Specification 223
- 2.2 V.35 Interface 224
- 2.2.1 Functional Description 224
- MN/U-SDM309B Rev. # C-Cβ19 226
- C-Cβ20 MN/U-SDM309B Rev. # 227
- 2.2.2 Connector Pinouts 228
- 2.2.3 Specification 228
- 3.0 Front Panel Operation 229
- 3.1 Configuration 229
- 3.2 Monitor 232
- 3.3 Faults 232
- 3.4 Stored Faults 233
- 3.5 Utility 233
- Figure C-13 Menu Tree 235
- Figure C-14 Menu Tree 236
- Figure C-15 Menu Tree 237
- MN/U-SDM309B Rev. # C-Cβ31 238
- Appendix D 239
- SOFTWARE CHANGE 239
- SPECIFICATIONS 239
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