Comtech EF Data CDM-570A User Manual
Page 121
CDM-570A/570AL Satellite Modem with Optional Packet Processor
MN-CDM570A
Front Panel Operation
Revision 2
6–17
employed, the upper data rate is reduced by 5% for data rates up to 2.048 Mbps,
and by 1.6% for data rates above 2.048 Mbps, where EDMAC2 framing is used, or
for Rate 21/44 BPSK/QPSK TPC, or Rate 5/16 BPSK TPC.
FEC Type
Modulation
Code Rate
Data Rate Range
EDMAC limited?
Lower Limit
(kbps)
Upper Limit
(Mbps)
Viterbi
BPSK
1/2
2.4
1.500
Yes – see preceding
“IMPORTANT” Note 4
QPSK/OQPSK
1/2
4.8
3.000
3/4
7.2
4.500
7/8
8.4
5.250
Viterbi + R-S
BPSK
1/2
2.4
1.363
QPSK/OQPSK
1/2
4.3
2.727
3/4
6.5
4.091
7/8
7.5
4.666
16-QAM
3/4
13.0
4.000
7/8
16.8
4.666
TCM + R-S
8-PSK
2/3
8.7
4.400
Turbo
BPSK
5/16
2.4
0.937
21/44
2.4
1.430
QPSK/OQPSK
21/44
4.8
2.860
3/4
7.2
4.500
7/8
8.4
5.250
0.95
9.1
5.666
8-PSK/8-QAM
3/4
10.8
6.750
No
7/8
13.6
7.875
0.95
15.3
8.500
16-QAM
3/4
14.4
9.000
7/8
16.8
9.980
VersaFEC
BPSK
0.488
2.4
1.462
No
QPSK
0.533
5.2
3.200
0.631
6.1
3.785
0.706
6.8
4.233
0.803
7.8
4.818
8-QAM
0.576
8.3
5.179
0.642
9.3
5.782
0.711
10.3
6.401
0.780
11.3
7.021
16-QAM
0.644
12.4
7.726
0.731
14.1
8.776
0.780
15.0
9.361
0.829
16.0
9.946
0.853
16.4
10.239
Ultra-Low
Latency (ULL)
BPSK
0.493
2.4
1.480
QPSK
0.493
4.7
2.960
0.654
6.3
3.924
0.734
7.0
4.405