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Comtech CDM-600 PSK Digital Satellite Modem

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  • 2.4 kbps to 20.0 Mbps
  • QPSK, 8PSK, 16QAM
  • 70 MHz and L-Band IF Versions
  • Drop and Insert (D&I++)


SKU: SATRES-6599

System Specifications
Frequency Range950 to 1750 MHz in 100 Hz steps
Input/Output Impedance50 Ohms Tx and 75 Ohms Rx
IF ConnectorsTx Type N, female, Rx Type F, female
Data Rate (See Manual)2.4 kbps to 20 Mbps in 1 bps steps within symbol rate range
Symbol Rate4.8 ksps to 10 Msps
Turbo Product Coding4.8 kbps to 5 Mbps (Low Rate Option)

4.8 kbps to 20 Mbps (High Rate Option)

ScramblingIntelsat IESS-308, -309, -310 or proprietary
FEC Options (Viterbi)BPSK, QPSK and OQPSK 1/2

QPSK, OQPSK and 16QAM w/RS 3/4 and 7/8
FEC Options (Sequential)BPSK 1/2, O/QPSK 3/4, and 7/8
Pragmatic TCM8PSK 2/3
Turbo Product CodingBPSK 21/44, 5/16 QPSK/OQPSK 3/4
(TPC) - Low Rate8PSK 3/4, 16QAM 3/4
Turbo Product CodingBPSK 21/44, 5/16 QPSK/OQPSK 1/2, 3/4, 7/8, 0.95
(TPC) - High Rate8PSK 3/4, 7/8, 0.95
(Enhanced)16QAM 3/4, 7/8, 0.95
Reed-SolomonIntelsat compliant, and proprietary modes available
UncodedBPSK, QPSK and OQPSK
M & C InterfaceEIA-232, EIA-485 (2- or 4-wire)
Form C RelaysTx, Rx traffic alarms and Unit faults

Backward alarms for IDR and IBS
Data Interface Specifications
Data InterfacesEIA-422/530, V.35, Sync EIA-232, G.703 balanced or

unbalanced, Low Voltage Differential Signal (LVDS),

HSSI (using CIC-20 HSSI/LVDS interface converter)
Drop And InsertG.703 (T1 or E1)
Frame formats supportedD4 or ESF for T1, CCS or CAS for E1
N x 64 kbps Data RatesN = 1 to 6, 8, 10, 12, 15, 16, 20, 24 or 30
ESC Interfaces (IDR)96 kbps overhead
IDR (Voice Orderwire)2 ADPCM (input: 4-wire VF), or 64 kbps data
IDR (Data Orderwire)8 kbps (EIA-422 interface)
IDR (Backward Alarms)Form C contacts, hardware or software mapped
IBS1/15 x data date overhead
IBS (ASYNC Data Orderwire)1/2000 x data rate
IBS (Backward Alarm)Form, C contacts
Receive Buffer64 to 262144 bits, in 16 bit increments
Receive Clock OptionsRx Satellite, Tx Terrestrial, EXT REF, Insert
Clock Tracking±100 ppm minimum
External Reference InputBNC connector, 2.4 kHz to 20 MHz
10MHz Reference Specifications
Stability0.02 ppm standard, 1.0 ppm optional (not with BUCs)
Power LevelBUC: 0 dBm ± 3dB via Tx center conductor

LNB -3 dBm ± 3dB via Rx center conductor
Modulator Specifications
Output Spectrum/filteringMeets IESS-308/309 power spectral mask
Frequency Stability± 0.02 ppm (standard) or ±1 ppm (optional), 0 to 50°C
Output Power0 to -30 dBm, 0.1 dB steps
Accuracy±1.5 dB over frequency and temperature
BUC FSK CommunicationsVia Tx center conductor with FSK BUCs
ODU / BUC Voltage24 VDC, 4 amps, 100W
ODU / BUC Voltage (Optional)48 VDC, 3 amps 150W
Environmental and Physical Specifications
TemperatureOperating: 0 to 50°C (32 to 122°F)

Storage: -25 to 85°C (-13 to 185°F)
Power Supply100 to 240 volts AC, 50/60 Hz
Power Consumption35 W typical (40 W maximum)
Physical Dimensions (1RU)1.75H x 19.0W x 19 D inch, 4.4H x 48W x 48D mm, approx.
Weight15 lbs (7.0 kg), approx
Agency ApprovalsCE: EN55022 Class B (Emissions), EN50082-1 Part 1

(Immunity), EN60950 (Safety). FCC: Part 15 Class B
Demodulator Specifications
Input Power, Minimum-130 dBm + 10 Log (Symbol Rate)
AGC50 dB above minimum
Max Composite Level+30 dBc, up to -5 dBm
Acquisition Range±500 KHz, programmable in 1 kHz steps
Acquisition TimeExample: 200 ms average at 64 kbps Rate1/2 QPSK,

and ± 32 kHz acquisition range
LNB Voltage+13, +18 VDC and 24 VDC at 500 mA max
EXAMPLE BER PERFORMANCEMET WITH TWO ADJACENT CARRIERS 7 dB HIGHER GUARANTEED Eb/No, in dB (Typical values in parentheses)
Viterbi (B, Q and OQ-PSK)
10-5
10-7
1/2
3/4
7/8
5.4(4.9) 6.8(6.3)7.7(7.2)
6.7(6.2) 8.2(7.7)9.0(8.6)
Sequential(Consult CDM-600L Manual for comprehensive details)
Viterbi and concatenated Reed-Solomon 220/200 or 200/180
(BPSK, QPSK, AND OQPSK)
10-5
10-7
1/2
3/4
7/8
4.3(4.0) 5.6(4.7)6.5(6.0)
4.5(4.2) 6.0(5.2)6.9(6.5)
8-PSK TCM/RS (IESS-310)(Consult CDM-600L Manual for comprehensive details)
Turbo Product Codec (QPSK/OQPSK)
10-6
10-8
1/2
3/4
7/8
0.95
3.5(3.2) 3.8(3.4)4.3(4.0)6.8(6.4)
3.6(3.3) 4.4(4.0)4.5(4.2)7.0(7.4)
(Please consult the CDM-600 Manual for a comprehensive listing of the performance of all FEC types, Code Rates, and Modulation types)

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