Rx/Tx Error Performance Characteristics; Table 6-1. The Versafec Modcod Set; Cdm-840 Rx/Tx Error Performance Characteristics - Comtech EF Data CDM-840 Installation And Operation Manual

CDM-840 Remote Router
Forward Error Correction
Modulation Code Rate
BPSK 0.488
QPSK 0.533
QPSK 0.631
QPSK 0.706
QPSK 0.803
8-QAM 0.642
8-QAM 0.711
8-QAM 0.780
16-QAM 0.731
16-QAM 0.780
16-QAM 0.829
16-QAM 0.853
6.3.1 Range of Data Rates
For the range of Data Rates, refer to
6.4

CDM-840 Rx/Tx Error Performance Characteristics

For Rx DVB-S2 Operation: Figure 6-2 through Figure 6-5 illustrate the guaranteed error
performance characteristics of the CDM-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
CDM-840.
For Tx VersaFEC Operation: Figure 6-6 through Figure 6-9 illustrate the guaranteed error
performance characteristics of the CDM-840.

Table 6-1. The VersaFEC ModCod set

Spectral
Block size, Typical Eb/No, for
Efficiency,
bits BER = 5 x 10
bps/Hz
0.49 2k
1.07 4.1k
1.26 4.1k
1.41 4.1k
1.61 4.1k
1.93 6.1k
2.13 6.1k
2.34 6.1k
2.93 8.2k
3.12 8.2k
3.32 8.2k
3.41 8.2k
Sect. 1.4 SUMMARY OF SPECIFICATIONS
6–4
Latency at
Min. Data Rate,
64 kbps, in
-8
milliseconds
2.4 dB 26
2.2 dB 53
2.7 dB 59
3.4 dB 62
3.8 dB 66
4.6 dB 89
5.2 dB 93
5.6 dB 97
6.3 dB 125
7.0 dB 129
7.5 dB 131
8.0 dB 132
Revision 0
MN-CDM840
Max. Data Rate,
CCM mode CCM mode
16 kbps 2.19 Mbps
18 kbps 4.80 Mbps
21 kbps 5.67 Mbps
23 kbps 6.34 Mbps
26 kbps 7.22 Mbps
31 kbps 8.67 Mbps
35 kbps 9.60 Mbps
38 kbps 10.53 Mbps
47 kbps 13.16 Mbps
50 kbps 14.04 Mbps
54 kbps 14.91 Mbps
55 kbps 15.35 Mbps
.