Comtech EF Data CDM-625 - Page 59

CDM-625 Advanced Satellite Modem Revision 13
Introduction MN-CDM625
1–19
LDPC CODEC BER
Rate 2/3 8-QAM
Rate 3/4 8-QAM
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10
-5
BER=10
-9
8-QAM Rate 2/3 LDPC
Guaranteed Eb/No:
(typical value in parentheses)
4.6 dB (4.2 dB)
5.0 dB (4.6 dB)
8-QAM Rate 3/4 LDPC
Guaranteed Eb/No:
(typical value in parentheses)
5.6 dB (5.2 dB)
6.0 dB (5.6 dB)
LDPC CODEC BER
Rate 3/4 16-QAM
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10
-5
BER=10
-9
16-QAM Rate 3/4 LDPC
Guaranteed Eb/No:
(typical value in parentheses)
6.8 dB (6.2 dB)
7.1 dB (6.8 dB)
VersaFEC CODEC BER
BPSK
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10
-5
BER=10
-8
Rate 0.488
Guaranteed Eb/No:
(typical value in parentheses)
2.4 dB (2.1 dB)
2.7 dB (2.4 dB)
VersaFEC CODEC BER
QPSK
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10
-5
BER=10
-8
Rate 0.533 QPSK
Guaranteed Eb/No:
(typical value in
parentheses)
2.3 dB (2.0 dB)
2.5 dB (2.2 dB)
Rate 0.631 QPSK
Guaranteed Eb/No:
(typical value in
parentheses)
2.8 dB (2.5 dB)
3.0 dB (2.7 dB)
Rate 0.706 QPSK
Guaranteed Eb/No:
(typical value in
parentheses)
3.3 dB (3.0 dB)
3.7 dB (3.4 dB)
Rate 0.803 QPSK
Guaranteed Eb/No:
(typical value in
parentheses)
3.8 dB (3.5 dB)
4.1 dB (3.8 dB)
VersaFEC CODEC BER
8-QAM
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10
-5
BER=10
-8
Rate 0.642 8-QAM
Guaranteed Eb/No:
(typical value in
parentheses)
4.6 dB (4.3 dB)
4.9 dB (4.6 dB)
Rate 0.711 8-QAM
Guaranteed Eb/No:
(typical value in
parentheses)
5.2 dB (4.9 dB)
5.5 dB (5.2 dB)
Rate 0.780 8-QAM
Guaranteed Eb/No:
(typical value in
parentheses)
5.6 dB (5.3 dB)
6.0 dB (5.7 dB)
VersaFEC CODEC BER
16-QAM
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10
-5
BER=10
-8
R 0.731 16-QAM
Guaranteed Eb/No:
(typical value in
parentheses)
6.4 dB (6.1 dB)
6.6 dB (6.3 dB)
R 0.780 16-QAM
Guaranteed Eb/No:
(typical value in
parentheses)
7.0 dB (6.7 dB)
7.3 dB (7.0 dB)
R 0.829 16-QAM
Guaranteed Eb/No:
(typical value in
parentheses)
7.5 dB (7.2 dB)
7.8 dB (7.5 dB)
R 0.853 16-QAM
Guaranteed Eb/No:
(typical value in
parentheses)
8.0 dB (7.7 dB)
8.3 dB (8.0 dB)
VersaFEC CODEC - Extended
CCM BER
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10
-5
BER=10
-8
R 0.576 8-QAM
Guaranteed Eb/No:
(typical value in
parentheses)
4.5 dB (4.2 dB)
4.9 dB (4.6 dB)
R 0.644 16-QAM
Guaranteed Eb/No:
(typical value in
parentheses)
6.4 dB (6.1 dB)
6.9 dB (6.6 dB)
Ultra-Low-Latency (ULL)
CODEC BER
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10
-5
BER=10
-8
R 0.493 BPSK
Guaranteed Eb/No:
(typical value in
parentheses)
3.1 dB (2.8 dB)
3.7 dB (3.4 dB)
R 0.493 QPSK
Guaranteed Eb/No:
(typical value in
parentheses)
3.1 dB (2.8 dB)
3.7 dB (3.4 dB)
R 0.654 QPSK
Guaranteed Eb/No:
(typical value in
parentheses)
3.6 dB (3.3 dB)
4.2 dB (3.9 dB)
R 0.734 QPSK
Guaranteed Eb/No:
(typical value in
parentheses)
4.1 dB (3.8 dB)
4.7 dB (4.4 dB)
Plesiochronous/
Doppler Buffer
Selectable size of 64 to 262,144 bits, in 16-bit steps (with added limitations for G.704 frame boundaries).
Size selection is displayed in bytes and milliseconds.
Supports asymmetric operation - when buffer is clocked from Tx clock, Rx and Tx rates do not need to be identical.