Comtech EF Data CDM-600/600L - Manual (Page 52)

CDM-600/600L Open Network Satellite Modem Revision 3
Introduction MN/CDM600L.IOM
1–24
LDPC CODEC BER
Rate 1/2 B/Q/OQPSK
Rate 2/3 Q/OQPSK
Rate 1/2 Q/OQPSK
(With two adjacent
carriers, each 7 dB higher
than the desired carrier)
For:
BPSK/QPSK/OQPSK
Rate 1/2 LDPC
Guaranteed Eb/No (typ
value in parentheses):
QPSK/OQPSK
Rate 2/3 LDPC
Guaranteed Eb/No (typ
value in parentheses):
QPSK/OQPSK
Rate 3/4 LDPC
Guaranteed Eb/No (typ
value in parentheses):
BER=10 -5 2.0 dB (1.7 dB) 2.3 dB (2.0 dB) 3.0 dB (2.6 dB)
BER=10 -9 2.3 dB (2.0 dB) 2.7 dB (2.3 dB) 3.3 dB (3.0 dB)
LDPC CODEC BER
Rate 2/3 8-PSK
Rate 3/4 8-PSK
(With two adjacent
carriers, each 7 dB higher
than the desired carrier)
For:
8-PSK Rate 2/3 LDPC
Guaranteed Eb/No (typ
value in parentheses):
8-PSK Rate 3/4 LDPC
Guaranteed Eb/No (typ
value in parentheses):
BER=10 -5 --- 5.7 dB (5.3 dB)
BER=10 -9 5.7 dB (5.2 dB) 6.0 dB (5.6 dB)
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:
8-QAM Rate 2/3 LDPC
Guaranteed Eb/No (typ
value in parentheses):
8-QAM Rate 3/4 LDPC
Guaranteed Eb/No (typ
value in parentheses):
BER=10 -5 4.6 dB (4.2 dB) 5.2 dB (4.7 dB)
BER=10 -9 5.0 dB (4.6 dB) 5.7 dB (5.3 dB)
LDPC CODEC BER
Rate 3/4 16-QAM
(With two adjacent
carriers, each 7 dB higher
than the desired carrier)
For:
16-QAM Rate 3/4 LDPC
Guaranteed Eb/No (typ
value in parentheses):
BER=10 -5 6.8 dB (6.2 dB)
BER=10 -5 7.1 dB (6.8 dB)
CDM-600L ONLY:
Rx Level Monitor ± 5 dB accuracy vs. frequency, temperature, and level
Input Composite
Power:
Maximum Composite
Operating Level
Absolute Maximum
No Damage
+30 dBc within 10 MHz of desired. Each adjacent carrier is like modulated and ≤ 7 dBc relative to
neighboring carrier.
+40 dBc with respect to Rx signal. Total carrier power within the symbol rate BW at 1/2 the
desired carrier frequency ≤10 dBc relative to the desired carrier power.
-5 dBm maximum
+20 dBm
Input Connector Type F Female @ 75 Ω, Type N Female @ 50 Ω
Input Return Loss ≥ 10 Db
LNB 10 MHz
Reference On center conductor of L-Band input connector, selectable ON/OFF. Level –3 ± 3 dBm.
Source: 1. Internal modem reference
2. 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.