Adaptive Coding And Modulation (Acm) - Comtech EF Data CDM-760 Installation And Operation Manual

Introduction
CDM-760 Advanced High-Speed Trunking Modem
DVB-S2X (in addition to DVB-S2 ModCods), Normal Block, Pilot ON, QEF (FER 1E-5) AWGN Linear Channel
Min SR
MOD FEC
(Msps)
13/45 0.1
QPSK 9/20 0.1
11/20 0.1
5/9-L 0.1
26/45-L 0.1
8PSK 23/36 0.1
25/36 0.1
13/18 0.1
1/2-L 0.1
8/15-L 0.1
5/9-L 0.1
26/45 0.1
3/5 0.1
3/5-L 0.1
16APSK 28/45 0.1
23/36 0.1
2/3-L 0.1
25/36 0.1
13/18 0.1
7/9 0.1
77/90 0.1
2/3-L 0.1
32/45 0.1
32APSK
11/15 0.1
7/9 0.1
32/45-L 0.1
11/15 0.1
64APSK 7/9 0.1
4/5 0.1
5/6 0.1

1.3.7 Adaptive Coding and Modulation (ACM)

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