Comtech EF Data ODM-840 - Manual (Page 174)

ODM/R-840 Outdoor Remote Router Revision 0
Appendix B MN-ODM840
B–4
performance in terms of both Eb/No and spectral efficiency – an essential aspect of a well‐
engineered ACM system.
Table B-1. The VersaFEC MODCOD set
Modulation Code Rate
Spectral
Efficiency,
bps/Hz
Block size,
bits
Typical Eb/No, for
BER = 5 x 10 -8
Latency at
64 kbps, in
milliseconds
Min. Data Rate,
CCM mode
Max. Data Rate,
CCM mode
BPSK 0.488 0.49 2k 2.4 dB 26 16 kbps 2.19 Mbps
QPSK 0.533 1.07 4.1k 2.2 dB 53 18 kbps 4.80 Mbps
QPSK 0.631 1.26 4.1k 2.7 dB 59 21 kbps 5.67 Mbps
QPSK 0.706 1.41 4.1k 3.4 dB 62 23 kbps 6.34 Mbps
QPSK 0.803 1.61 4.1k 3.8 dB 66 26 kbps 7.22 Mbps
8-QAM 0.642 1.93 6.1k 4.6 dB 89 31 kbps 8.67 Mbps
8-QAM 0.711 2.13 6.1k 5.2 dB 93 35 kbps 9.60 Mbps
8-QAM 0.780 2.34 6.1k 5.6 dB 97 38 kbps 10.53 Mbps
16-QAM 0.731 2.93 8.2k 6.3 dB 125 47 kbps 13.16 Mbps
16-QAM 0.780 3.12 8.2k 7.0 dB 129 50 kbps 14.04 Mbps
16-QAM 0.829 3.32 8.2k 7.5 dB 131 54 kbps 14.91 Mbps
16-QAM 0.853 3.41 8.2k 8.0 dB 132 55 kbps 15.35 Mbps
B.3.1 Range of Data Rates
For the range of data rates, refer to Sect. 1.4 SUMMARY OF SPECIFICATIONS .
B.4 ODM/R-840 Rx/Tx Error Performance Characteristics
For Rx DVB‐S2 Operation: Figure B‐2 through Figure B‐5 illustrate the guaranteed error
performance characteristics of the ODM/R‐840 while receiving with Normal frames (64,800
bits), Pilots ON.
QPSK 1/4, 1/3, 2/5 are shown for information only and are not available in the ODM/R‐840.
For Tx VersaFEC Operation: Figure B‐6 through Figure B‐9 illustrate the guaranteed error
performance characteristics of the ODM/R‐840.