Mocomtech CDM-570L Manuel D’Utilisation
CDM-570/570L Satellite Modem with Optional IP Module
Revision 4
Summary of Specifications
Reed-Solomon (Closed Network):
220,200 outer code (transparent mode)
200,180 outer code (EDMAC modes)
Interleaver depth = 4
8-PSK/TCM Rate 2/3 (Trellis) with concatenated Reed-Solomon
CLOSED NETWORK - NOT IESS-310 COMPATIBLE
Turbo Product Codec (optional plug-in card):
Rate 5/16 BPSK - 2 dimensional
Rate 21/44 BPSK
220,200 outer code (transparent mode)
200,180 outer code (EDMAC modes)
Interleaver depth = 4
8-PSK/TCM Rate 2/3 (Trellis) with concatenated Reed-Solomon
CLOSED NETWORK - NOT IESS-310 COMPATIBLE
Turbo Product Codec (optional plug-in card):
Rate 5/16 BPSK - 2 dimensional
Rate 21/44 BPSK
- 3 dimensional
Rate 21/44 QPSK/OQPSK - 3 dimensional
Rate 3/4 QPSK/OQPSK/8-PSK/8-QAM/16-QAM - 2 dimensional
Rate 7/8 QPSK/OQPSK/8-PSK/8-QAM/16-QAM - 2 dimensional
Rate 0.95 QPSK/OQPSK/8-QAM/8-PSK - 2 dimensional eTPC
(exact Code Rate is actually 17/18, or 0.944)
Rate 3/4 QPSK/OQPSK/8-PSK/8-QAM/16-QAM - 2 dimensional
Rate 7/8 QPSK/OQPSK/8-PSK/8-QAM/16-QAM - 2 dimensional
Rate 0.95 QPSK/OQPSK/8-QAM/8-PSK - 2 dimensional eTPC
(exact Code Rate is actually 17/18, or 0.944)
Output frequency
CDM-570L: 950 - 1950 MHz, 100 Hz resolution
Stability ±0.06 ppm (±6 x 10
Stability ±0.06 ppm (±6 x 10
-8
) 0 to 50
o
C (32 to 122
o
F), when using internal reference
CDM-570: 50 - 90 MHz, and 100 – 180 MHz, 100 Hz resolution
Stability ±1.0 ppm (±1 x 10
Stability ±1.0 ppm (±1 x 10
-6
) 0 to 50
o
C (32 to 122
o
F), when using internal reference
Harmonics
and spurious
and spurious
Better than -55 dBC/4 kHz (typically <-60 dBC/4 kHz) – measured from 25 MHz to 2 GHz
Transmit on/off ratio
55 dB minimum
Output phase noise
< 0.67
0
rms double sided, 100 Hz to 1 MHz
(minimum of 10 dB better overall than the INTELSAT IESS-308/309 requirement)
Output power
CDM-570L: 0 to -40 dBm, 0.1 dB steps - manual mode. See Automatic Uplink Power Control section
CDM-570: 0 to -25 dBm, 0.1 dB steps - manual mode. See Automatic Uplink Power Control section also.
CDM-570: 0 to -25 dBm, 0.1 dB steps - manual mode. See Automatic Uplink Power Control section also.
Power accuracy
CDM-570L: ±1.0 dB over frequency, data rate, modulation type and temperature
CDM-570: ±0.5 dB over frequency, data rate, modulation type and temperature
CDM-570: ±0.5 dB over frequency, data rate, modulation type and temperature
Output impedance
CDM-570L: 50
Ω, 19 dB minimum return loss
CDM-570: 50
Ω, or 75Ω 17 dB minimum return loss
Output connector
CDM-570L: Type N female
CDM-570: BNC female
CDM-570: BNC female
Clocking options
CDM-570L: Internal, ±0.06 ppm (SCT)
CDM-570: Internal, ±1.0 ppm (SCT)
External, locking over a ±100 ppm range (TT)
Loop timing (Rx satellite clock) - supports asymmetric operation - Rx and Tx data rates do not need to be
identical
CDM-570: Internal, ±1.0 ppm (SCT)
External, locking over a ±100 ppm range (TT)
Loop timing (Rx satellite clock) - supports asymmetric operation - Rx and Tx data rates do not need to be
identical
External TX
Carrier Off
Carrier Off
By TTL 'low' signal or external contact closure - hardware function automatically over-rides processor, or
by RTS signal on main data interface
by RTS signal on main data interface
BUC Reference
(10 MHz)
Phase Noise
(10 MHz)
Phase Noise
On center conductor of L-band output connector; 10.0 MHz ± 0.02 ppm (Optional 1 ppm)
0.0 dBm, ± 3 dBm; programmable ON/OFF
Source: 1. Internal Modem Reference
0.0 dBm, ± 3 dBm; programmable ON/OFF
Source: 1. Internal Modem Reference
2. External Reference (10 MHz)
dB/Hz
Frequency Offset
-80
1
Hz
-110
10
Hz
-135
100
Hz
-140
1
kHz
12–2