Comtech EF Data CDM-625 - Manual (Page 52)

CDM-625 Advanced Satellite Modem Revision 15
Introduction MN-CDM625
1–16
Clock tracking range ±100 ppm min
Clocking modes Full range of clocking options supported – see plesiochronous/Doppler buffer section
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,13V, 18V per DiSEq 4.2 and 24VDC at 500
mA max.
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 -X Rate – Guaranteed Eb/No (typical value in parentheses)
BER=10 -5
BER=10 -6
BER=10 -7
Rate 1/2 (B, Q, OQ)
5.4 dB (4.9 dB)
6.0 dB (5.5 dB)
6.7 dB (6.2 dB)
Rate 3/4 (Q, OQ)
6.8 dB (6.3 dB)
7.4 dB (6.9 dB)
8.2 dB (7.7 dB)
Rate 7/8 (Q, OQ)
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)
BER=10 -5
BER=10 -6
BER=10 -7
Rate 1/2 (B, Q, OQ)
4.3 dB (4.0 dB)
4.4 dB (4.1 dB)
4.5 dB (4.2 dB)
Rate 3/4 (Q, OQ)
5.6 dB (4.7 dB)
5.8 dB (4.8 dB)
6.0 dB (5.2 dB)
Rate 7/8 (Q, OQ)
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)
BER=10 -5
BER=10 -7
BER=10 -8
Rate 2/3 8PSK/TCM
7.9 dB (7.2 dB)
9.5 dB (8.7 dB)
10.4 dB (9.5 dB)
Rate 2/3 8PSK/TCM
with concatenated RS
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)
BER=10 -6
BER=10 -8
Rate 3/4 16-QAM
Viterbi/RS
8.1 dB (7.5 dB)
8.6 dB (8.0 dB)
Rate 7/8 16-QAM
Viterbi/RS
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)
BER=10 -4
BER=10 -6
BER=10 -8
Rate 1/2 (B, Q, OQ)
4.4 dB (4.0 dB)
5.1 dB (4.6 dB)
5.7 dB (5.2 dB)
Rate 3/4 (Q, OQ)
5.2 dB (4.7 dB)
5.8 dB (5.4 dB)
6.4 dB (6.0 dB)
Rate 7/8 (Q, OQ)
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)
BER=10 -4
BER=10 -6
BER=10 -8
Rate 1/2 (Q, OQ)
5.0 dB (4.6 dB)
5.8 dB (5.4 dB)
6.7 dB (6.3 dB)
Rate 3/4 (Q, OQ)
5.6 dB (5.2 dB)
6.4 dB (6.0 dB)
7.3 dB (6.8 dB)
Rate 7/8 (Q, OQ)
6.5 dB (6.0 dB)
7.6 dB (7.2 dB)
8.7 dB (8.2 dB)
SEQUENTIAL and RS
220,200 Outer Code at 512
kbps BER performance
(with two adjacent carriers,
each 7 dB higher than the
desired carrier)
BER=10 -4
BER=10 -6
BER=10 -8
Rate 1/2 (B, Q, OQ)
4.5 dB (4.1 dB)
4.7 dB (4.3 dB)
4.9 dB (4.6 dB)
Rate 3/4 (Q, OQ)
5.0 dB (4.6 dB)
5.2 dB (4.8 dB)
5.4 dB (5.0 dB)
Rate 7/8 (Q, OQ)
5.9 dB (5.5 dB)
6.1 dB (5.7 dB)
6.3 dB (5.9 dB)
TURBO PRODUCT CODEC
BER (with two adjacent
carriers, each 7 dB higher
than the desired carrier)
BER=10 -6
BER=10 -7
BER=10 -8
Rate 21/44 (B, Q, OQ)*
3.1 dB (2.9 dB)
3.3 dB (3.1 dB)
3.5 dB (3.3 dB)
* See Notes 1 and 2
Rate 5/16 (B)
2.7 dB (2.5dB)
2.9 dB (2.7dB)
3.1 dB (2.9dB)
TURBO PRODUCT CODEC
BER (with two adjacent
carriers, each 7 dB higher
than the desired carrier)
BER=10 -6
BER=10 -7
BER=10 -8
Rate 3/4 (Q, OQ)
3.8dB (3.4dB)
4.1dB (3.7dB)
4.4dB (4.0dB)
Rate 3/4 (8PSK, 8-QAM)
6.4 dB (6.0 dB)
6.7 dB (6.3 dB)
7.1 dB (6.7 dB)
Rate 3/4 (16-QAM)
7.8 dB (7.4 dB)
8.1 dB (7.7 dB)
8.5 dB (8.2 dB)