Comtech EF Data CDM-570 - Manual (Page 55)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Introduction MN/CDM570L.IOM
1–15
TURBO PRODUCT CODEC
Rate 7/8 QPSK
Rate 7/8 8-PSK
Rate 7/8 16-QAM
BER
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10 -6
BER=10 -7
BER=10 -8
Rate 7/8 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
4.3 dB (4.0 dB)
4.4 dB (4.1 dB)
4.5 dB (4.2 dB)
Rate 7/8 (8-PSK)
Guaranteed Eb/No:
(typical value in
parentheses)
7.0 dB (6.6 dB)
7.1 dB (6.7 dB)
7.2 dB (6.8 dB)
Rate 7/8 (16-QAM)
Guaranteed Eb/No:
(typical value in parentheses)
8.1 dB (7.7 dB)
8.2 dB (7.8 dB)
8.3 dB (7.9 dB)
TURBO PRODUCT CODEC
Rate 0.95 QPSK
Rate 0.95 8-PSK
BER
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10 -6
BER=10 -7
BER=10 -8
Rate 0.95 (Q, OQ)
Guaranteed Eb/No:
(typical value in
parentheses)
6.4 dB (6.0 dB)
6.7 dB (6.3 dB)
6.9 dB (6.5 dB)
Rate 0.95 (8-PSK)
Guaranteed Eb/No:
(typical value in parentheses)
9.3 dB (8.9 dB)
9.8 dB (9.4 dB)
10.3 dB (9.9 dB)
TURBO PRODUCT CODEC
Rate 3/4 8-QAM
Rate 7/8 8-QAM
Rate 0.95 8-QAM
BER
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10 -6
BER=10 -7
BER=10 -8
Rate 3/4 (8-QAM)
Guaranteed Eb/No:
(typical value in parentheses)
6.5 dB (6.1 dB)
6.8 dB (6.4 dB)
7.2 dB (6.8 dB)
Rate 7/8 (8-QAM)
Guaranteed Eb/No:
(typical value in
parentheses)
6.6 dB (6.2 dB)
6.7 dB (6.3 dB)
6.8 dB (6.4 dB)
Rate 0.95 (8-QAM)
Guaranteed Eb/No:
(typical value in parentheses)
9.6 dB (9.2 dB)
10.1 dB (9.7 dB)
10.6 dB (10.2 dB)
16-QAM VITERBI/R-S
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10
-6
BER=10 -8
16-QAM Rate 3/4
Viterbi/R-S
Guaranteed Eb/No:
(typical value in parentheses)
8.1 dB (7.5 dB)
8.6 dB (8.0 dB)
16-QAM Rate 7/8
Viterbi/R-S
Guaranteed Eb/No:
(typical value in
parentheses)
9.5 dB (9.0 dB)
10.1 dB (9.5 dB)
Plesiochronous/
Doppler Buffer Selectable size of ± 128, 256, 512, 1024, 2048, 4096, 8192, 16384 and 32768 bits
Size selection is displayed in bits and milliseconds. Supports asymmetric operation - when buffer is clocked from
Tx clock, Rx and Tx rates do not need to be identical.
Monitor Functions Eb/No estimate, 2 to 16 dB ( ± 0.25 dB accuracy)
Corrected Bit Error Rate, 1E-3 to 1E-9
Frequency offset,
± 200 kHz range, 100 Hz resolution
Buffer fill state, in percent
Receive signal level monitor accuracy:
± 5 dB for CDM-570L, ± 3 dB for CDM–570 over specified min to max
signal range
1.4.3 Automatic Uplink Power Control
Operating Mode Requires Closed Network Framed mode for transport of Eb/No information from remote
modem (EDMAC can be enabled or disabled)
Target Eb/No Range 0 to 14.9 dB at remote demod (default is 4.0 dB)
Max AUPC Range 0 to 9 dB (default is 3 dB)
Monitor Functions Remote demod Eb/No and Tx power level increase (front panel or via remote control interface)