CDM-425 Advanced Satellite Modem
Revision 0
Introduction
1–15
MN-CDM-425
FEC
VersaFEC Codec:
Rate 0.488 BPSK (also 0.493 BPSK Ultra-Low-Latency)
Rate 0.533, 0.631, 0.706, 0.803 QPSK (0.493, 0.654, 0.734 Ultra-Low-Latency)
Rate 0.642, 0.711, 0.780 8-QAM (also 0.576 8-QAM Extended CCM)
Rate 0.731, 0.780, 0.829, 0.853 16-QAM (also 0.644 16-QAM Extended CCM)
VersaFEC-2 Long-Block Codec:
Rate 0.489 BPSK
Rate 0.489, 0.537, 0.586, 0.611, 0.635, 0.660, 0.684, 0.733 QPSK
Rate 0.521, 0.537, 0.562, 0.586, 0.611, 0.635, 0.660, 0.684, 0.708, 0.733 8-ARY
Rate 0.586, 0.611, 0.635, 0.660, 0.684, 0.708, 0.733, 0.757, 0.782 16-ARY
Rate 0.660, 0.684, 0.708, 0.733, 0.757, 0.782, 0.801, 0.831, 0.855, 0.879 32-ARY
VersaFEC-2 Short-Block Codec:
Rate 0.489 BPSK
Rate 0.489, 0.537, 0.586, 0.611, 0.635, 0.660, 0.684, 0.733 QPSK
Rate 0.521, 0.537, 0.562, 0.586, 0.611, 0.635, 0.660, 0.684, 0.708, 0.733 8-ARY
Rate 0.586, 0.611, 0.635, 0.660, 0.684, 0.708, 0.733, 0.757, 0.782 16-ARY
Rate 0.660, 0.684, 0.708, 0.733, 0.757, 0.782, 0.801, 0.831 32-ARY
Transmit filtering
Root-Raised Cosine, alpha = 0.05, 0.10, 0.15, 0.20, 0.25, and 0.35 – front panel/software selectable
See graphs of output spectrum provided at the end of this section
Scrambling
All VersaFEC
®
, VersaFEC-2
®
modes use IESS-315/V.35
External Reference
As an input: 1, 2, 5 or 10MHz -6dBm to +10dBm (nominal 50/75
Ω
, BNC female connector)
As an output: 10MHz, 2.7 volts peak-to-peak ±0.4 volts, low impedance output
(The Ext. reference phase locks Tx and Rx synthesizers, and all baseband clock generation)
Harmonics/spurious Better than -60 dBC/4 kHz (typically <-65 dBC/4kHz)
950-2250 MHz band: measured F
0
±500 MHz
50-180 MHz band: measured from 1 to 500 MHz
Transmit on/off ratio -60 dBC minimum
Output phase noise < 0.48
0
rms double sided, 100 Hz to 1MHz (minimum of 16 dB better overall than the INTELSAT
IESS-308/309 requirement)
dB/Hz
Frequency Offset
-63.0
100 Hz
-73.0
1 kHz
-83.0
10 kHz
-93.0
100 kHz
Fundamental AC line spurious is -42 dBc or lower
The sum of all other single sideband spurious, from 0 to 0.75 x symbol rate, is -48 dBc or lower
Содержание CDM-425
Страница 30: ...CDM 425 Advanced Satellite Modem Revision Preface xxviii MN CDM 425 Notes...
Страница 72: ...CDM 425 Advanced Satellite Modem Revision 0 Installation 2 8 MN CDM 425 BLANK PAGE...
Страница 118: ...CDM 425 Advanced Satellite Modem Revision 0 FAST Activation Procedure 5 6 MN CDM 425 Notes...
Страница 194: ...CDM 425 Advanced Satellite Modem Revision 0 Front Panel Operation 6 76 MN CDM 425 Figure 6 3 Loopback Modes...
Страница 390: ...CDM 425 Advanced Satellite Modem Revision 0 Serial Remote Control 8 66 MN CDM 425 BLANK PAGE...
Страница 558: ...CDM 425 Advanced Satellite Modem Revision 0 ODU Transceiver BUC LNB Operation 10 68 MN CDM 425 Notes...
Страница 574: ...CDM 425 Advanced Satellite Modem Revision 0 Appendix B B 12 MN CDM 425 BLANK PAGE...
Страница 575: ...CDM 425 Advanced Satellite Modem Revision 0 Appendix B B 13 MN CDM 425 Figure B 8 VersaFEC 2 Short Block...
Страница 576: ...CDM 425 Advanced Satellite Modem Revision 0 Appendix B B 14 MN CDM 425 Figure B 9 VersaFEC 2 Short Block...
Страница 587: ...CDM 425 Advanced Satellite Modem Revision 0 Appendix E E 3 MN CDM 425 Figure E 1 TX Clock Modes...
Страница 589: ...CDM 425 Advanced Satellite Modem Revision 0 Appendix E E 5 MN CDM 425 Figure E 2 RX Clock Modes...
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Страница 607: ...CDM 425 Advanced Satellite Modem Revision 0 Appendix F F 5 MN CDM 425 Figure F 2 Conventional FDMA Link...
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Страница 685: ...CDM 425 Advanced Satellite Modem Revision 0 Appendix K K 5 MN CDM 425 Figure K 1 ACM over Satellite Generic Example...
Страница 686: ...CDM 425 Advanced Satellite Modem Revision 0 Appendix K K 6 MN CDM 425 BLANK PAGE...
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Страница 728: ...CDM 425 Advanced Satellite Modem Revision 0 Appendix M M 16 MN CDM 425 Notes...
Страница 742: ...CDM 425 Advanced Satellite Modem Revision 0 Appendix P P 6 MN CDM 425 Notes...
Страница 743: ......
Страница 744: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...