Comtech EF Data CDM-760 - Adaptive Coding and Modulation (ACM)

Introduction Revision 4
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
1–15
DVB-S2X (in addition to DVB-S2 ModCods), Normal Block, Pilot ON, QEF (FER 1E-5) AWGN Linear Channel
MOD FEC
Min SR
(Msps)
Max SR
(Msps)
Min DR
(Mbps)
Max DR
(Mbps)
Spec Eff
(Bits / Hz)
QEF Eb/No
( * = EB2)
QEF Es/No
( * = EB2)
QPSK
13/45
0.1
150
0.06
83.14
0.55
0.8
-1.8
9/20
0.1
150
0.09
130.20
0.87
1.0
0.4
11/20
0.1
150
0.11
159.40
1.06
1.4
1.7
8PSK
5/9-L
0.1
120
0.16
193.18
1.61
2.9
5.0
26/45-L
0.1
120
0.17
200.96
1.67
3.2
5.4
23/36
0.1
120
0.19
222.37
1.85
3.8
6.5
25/36
0.1
120
0.20
241.84
2.02
4.3
7.3
13/18
0.1
120
0.21
251.57
2.10
4.5
7.7
16APSK
1/2-L
0.1
90
0.19
173.29
1.93
3.5
6.3
8/15-L
0.1
90
0.21
184.94
2.05
3.7
6.8
5/9-L
0.1
90
0.21
192.71
2.14
3.8
7.1
26/45
0.1
90
0.22
200.47
2.23
4.4
7.9
3/5
0.1
90
0.23
208.24
2.31
4.7
8.3
3/5-L
0.1
90
0.23
208.24
2.31
4.1
7.7
28/45
0.1
90
0.24
216.01
2.40
4.7
8.5
23/36
0.1
90
0.25
221.83
2.46
4.7
8.6
2/3-L
0.1
90
0.26
231.54
2.57
4.5
8.6
25/36
0.1
90
0.27
241.25
2.68
5.3
9.6
13/18
0.1
90
0.28
250.96
2.79
5.5
10.0
7/9
0.1
90
0.30
270.38
3.00
6.1
10.9
77/90
0.1
90
0.33
297.56
3.31
7.1
12.3
32APSK
2/3-L
0.1
72
0.32
231.73
3.22
6.5
11.6
32/45
0.1
72
0.34
247.28
3.43
6.8
12.2
11/15
0.1
72
0.35
255.05
3.54
7.1
12.6
7/9
0.1
72
0.38
270.60
3.76
7.8
13.5
64APSK
32/45-L
0.1
54
0.41
222.01
4.11
8.4
14.5
11/15
0.1
54
0.42
228.99
4.24
9.0
15.3
7/9
0.1
54
0.45
242.95
4.50
9.5
16.0
4/5
0.1
54
0.46
249.93
4.63
9.7
16.4
5/6
0.1
54
0.48
260.39
4.82
10.3
17.1
1.3.7 Adaptive Coding and Modulation (ACM)
ACM Operational Mode Functional in DVB-S2, DVB-S2-EB1/EB2, or DVB-S2X network specification modes
Symbol Rate Range 1 to 150 Msps
Interface
10/100/100BaseT Ethernet, with auto-sensing 10/100/1000 and auto-crossover detection or optional
Optical Gigabit Ethernet interface
Remote Es/No reporting Automatically reported from remote modem
Max span of data rate 0.1 to 314 Mbps (entire range of modem capability)
Switch point
(decreasing Es/No)
Corresponds to Es/No (plus impairments) at QEF (~PER = 10
-7
)
Max fading rate Configurable Target Es/No margin from 0.0 to 4.5 dB