Comtech EF Data CDM-625 - Page 57

CDM-625 Advanced Satellite Modem Revision 13
Introduction MN-CDM625
1–17
LNB 10 MHz Reference
On center conductor of L-Band input connector, selectable ON/OFF. Level: -3dBm
±
3 dB.
Source: either Internal modem reference or External reference
Performance: For phase noise, refer to L-Band modulator 10 MHz. Frequency stability same as the modulator 10 MHz
reference.
LNB Voltage
On center conductor of L-Band input connector, selectable ON/OFF, 13, 18 volts per DiSEq 4.2 and 24VDC at 500 mA
maximum.
LNB Current Alarm
Programmable MIN and MAX current alarms.
VITERBI BER performance
(met in the presence of two
adjacent carriers, each 7 dB
higher than the desired carrier)
For:
BER=10
-5
BER=10
-6
BER=10
-7
Rate 1/2 (B, Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
5.4 dB (4.9 dB)
6.0 dB (5.5 dB)
6.7 dB (6.2 dB)
Rate 3/4 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
6.8 dB (6.3 dB)
7.4 dB (6.9 dB)
8.2 dB (7.7 dB)
Rate 7/8 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
7.7 dB (7.2 dB)
8.4 dB (7.9 dB)
9.0 dB (8.6 dB)
VITERBI and RS 220,200 or
200,180 Outer Code BER (with
two adjacent carriers, each 7
dB higher than the desired
carrier)
For:
BER=10
-5
BER=10
-6
BER=10
-7
Rate 1/2 (B, 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 3/4 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
5.6 dB (4.7 dB)
5.8 dB (4.8 dB)
6.0 dB (5.2 dB)
Rate 7/8 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
6.5 dB (6.0 dB)
6.7 dB (6.2 dB)
6.9 dB (6.5 dB)
8PSK/TCM CODEC
BER (with two adjacent
carriers, each 7 dB higher than
the desired carrier)
For:
BER=10
-5
BER=10
-7
BER=10
-8
Rate 2/3 8PSK/TCM
Guaranteed Eb/No:
(typical value in parentheses)
7.9 dB (7.2 dB)
9.5 dB (8.7 dB)
10.4 dB (9.5 dB)
Rate 2/3 8PSK/TCM
w/concatenated RS
Guaranteed Eb/No:
(typical value in parentheses)
6.3 dB (5.4 dB)
6.7 dB (5.8 dB)
6.9 dB (6.0 dB)
16-QAM VITERBI/
220,200 RS BER (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/RS
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/RS
Guaranteed Eb/No:
(typical value in parentheses)
9.5 dB (9.0 dB)
10.1 dB (9.5 dB)
Attention:
For 126,112
Reed-Solomon
Add 0.2 dB to these figures
SEQUENTIAL at 64 kbps
BER performance (met in the
presence of two adjacent
carriers, each 7 dB higher than
the desired carrier)
For:
BER=10
-4
BER=10
-6
BER=10
-8
Rate 1/2 (B, Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
4.4 dB (4.0 dB)
5.1 dB (4.6 dB)
5.7 dB (5.2 dB)
Rate 3/4 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
5.2 dB (4.7 dB)
5.8 dB (5.4 dB)
6.4 dB (6.0 dB)
Rate 7/8 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
6.2 dB (5.7 dB)
7.0 dB (6.6 dB)
7.9 dB (7.4 dB)
SEQUENTIAL
at 2048 kbps BER
performance (met in the
presence of two adjacent
carriers, each 7 dB higher than
the desired carrier)
For:
BER=10
-4
BER=10
-6
BER=10
-8
Rate 1/2 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
5.0 dB (4.6 dB)
5.8 dB (5.4 dB)
6.7 dB (6.3 dB)
Rate 3/4 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
5.6 dB (5.2 dB)
6.4 dB (6.0 dB)
7.3 dB (6.8 dB)
Rate 7/8 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
6.5 dB (6.0 dB)
7.6 dB (7.2 dB)
8.7 dB (8.2 dB)