Comtech EF Data SDM-650B Installation And Operation Manual page 22

Table of Contents
Figure 1-1. SDM-650B....................................................................................................................................1-1
Figure 1-2. Satellite Communications System with an SDM-650B ................................................................1-2
Figure 1-3. Modular Construction ...................................................................................................................1-4
Figure 1-4. Sequential Decoder BER Performance Curves (1/2 Rate)............................................................1-8
Figure 1-5. Sequential Decoder BER Performance Curves (3/4 Rate)............................................................1-9
Figure 1-6. Sequential Decoder BER Performance Curves (7/8 Rate)..........................................................1-10
Figure 1-7. Viterbi Decoder BER Performance Curves (1/2 Rate) ...............................................................1-11
Figure 1-8. SDM-650B Typical Output Spectrum ........................................................................................1-12
Figure 2-1. SDM-650B Rear Panel View ........................................................................................................2-2
Figure 3-1. M&C Card ....................................................................................................................................3-2
Figure 3-2. RS-422 and MIL-STD-188-114 Interface Board..........................................................................3-7
Figure 3-3. RS-422 and MIL-STD-188-114 Block Diagram ..........................................................................3-8
Figure 3-4. V.35 Interface Card.....................................................................................................................3-14
Figure 3-5. V.35 Interface Block Diagram ....................................................................................................3-15
Figure 3-6. DS-1 Interface Card ....................................................................................................................3-20
Figure 3-7. DS-1 Interface Block Diagram....................................................................................................3-21
Figure 3-8. G.703 2048 kbit/s Interface Card................................................................................................3-24
Figure 3-9. G.703 2048 Interface Block Diagram .........................................................................................3-25
Figure 3-10. G.703 2048 kbit/s Interface Connector Board (Optional).........................................................3-28
Figure 3-11. G.703 2048 kbit/s Connector Board Schematic Diagram .........................................................3-29
Figure 3-12. Asynchronous Overhead Interface Block Diagram ..................................................................3-32
Figure 3-13. Asynchronous Overhead Jumpers.............................................................................................3-33
Figure 3-14. AS/3812 Doppler Buffer Daughter Card ..................................................................................3-43
Figure 3-15. Clock Slip Diagram...................................................................................................................3-45
Figure 3-16. RS-422 or V.35 Master Slave Configuration............................................................................3-51
Figure 3-17. G.703 Master Slave Configuration ...........................................................................................3-53
Figure 3-18. X.21 Master/Slave Configuration .............................................................................................3-54
Figure 3-19. G.703 Master Slave Configuration ...........................................................................................3-55
Figure 3-20. Master/Master Customer Clock Configuration .........................................................................3-56
Figure 3-21. Master/Master Station Clock Configuration Diagram ..............................................................3-58
Figure 4-1. SDM-650B Front Panel View.......................................................................................................4-2
Figure 5-1. Modulator Block Diagram ............................................................................................................5-2
Figure 5-2. Modulator Output Spectral Occupancy.........................................................................................5-4
Figure 5-3. Decoder Block Diagram................................................................................................................5-7
Figure 5-4. Sequential Decoder BER Performance Curves (1/2 Rate)..........................................................5-13
Figure 5-5. Sequential Decoder BER Performance Curves (3/4 Rate)..........................................................5-14
Figure 5-6. Sequential Decoder BER Performance Curves (7/8 Rate)..........................................................5-15
Figure 5-7. Demodulator Block Diagram ......................................................................................................5-16
Figure 6-1. Typical Output Spectrum ..............................................................................................................6-4
Figure 6-2. Typical Output Spectrum ..............................................................................................................6-4
Figure 6-3. Typical Eye Pattern with Noise (Approximately 7.5 dB E
Figure 6-4. Typical Eye Pattern without Noise ...............................................................................................6-6
Figure 6-5. Typical Eye Constellation with Noise (Approximately 7.5 dB E
Figure 6-6. Typical Eye Constellation without Noise......................................................................................6-7
Figure 6-7. Modulator Test Points...................................................................................................................6-8
Figure 6-8. Demodulator Test Points...............................................................................................................6-9
Figure 6-9. Sequential Decoder/Demod Card Test Points.............................................................................6-10
Figure 6-10. Rear View Without Cover.........................................................................................................6-20
Figure A-1. Modulator Filter Card Change .................................................................................................... A-2
Figure A-2. Demodulator Filter Card Change ................................................................................................ A-4
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Figures
SDM-650B Satellite Modem
/N ) ...................................................6-6
b 0
/N ) .........................................6-7
b 0
Rev. 5