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Comtech EF Data SDM-9000 Satellite Modem

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  • Data Rates 6 Mbit/s to 52 Mbit/s
  • Bandwidth Efficient
  • Viterbi and Reed-Solomon
  • Extensive Diagnostics


Configuration Retention
Note:Modem configurations are maintained in non-volatile memory

that can be maintained for at least one year without external power.
Interface Specifications
G.703 Interface:

  Data Rate

  Buffer Clock

  Line Coding

32.064, 34.368, 44.736, or 51.84 Mbit/s

Internal, External Reference, Tx Terrestrial, or Satellite (Bypass)

B3ZS, HDB3, or None (AMI)
ECL Interface:

  Data rate

  Buffer Clock Source

  Tx Clock Source

6 to 52 Mbit/s

Internal, External Reference, Tx Terrestrial, or Satellite (Bypass)

Internal (SCT) or Tx Terrestrial
Monitor and Control Specifications
Local user Keypad Interface6-button
LCD Display2 lines, 16 characters per line
Status LEDs:Power On

Tx On

Carrier detect

Test mode

Tx fault

Rx fault

Common equipment fault

Stored fault

Tx alarm

Rx alarm

Remote User Interface:

  ASYNC Serial Interface

  Baud Rate

  Serial Format

  Data Bits

  Stop Bits



EIA-485 (2-/4-wire) or EIA-232

300, 600, 1200, 2400, 4800, 9600, or 19200 bit/s




Odd or Even

Configurable address from 1 to 255

Status RelaysTX fault

RX fault

Common equipment fault

Tx alarm

Rx alarm

Deferred maintenance alarm

Performance for BER Equal to 1 X 10-10
Modulation Type:

  QPSK 1/2 Viterbi

  QPSK 3/4 Viterbi

  QPSK 7/8 Viterbi

  8PSK 2/3 Viterbi with RS

  8PSK 5/6 Viterbi with RS

  16QAM 3/4 Viterbi with RS

  16QAM 7/8 Viterbi/RS

7.2 dB Guaranteed Eb/N0

8.8 dB Guaranteed Eb/N0

9.9 dB Guaranteed Eb/N0

6.6 dB Guaranteed Eb/N0

8.9 dB Guaranteed Eb/N0

8.7 dB Guaranteed Eb/N0

10.3 dB Guaranteed Eb/N0
System Specifications
Operating Frequency Range50 to 180 Mhz, in 2.5 kHz steps
Digital Interface (Standard)G.703 or MIL-STD-188-141
Digital Data RateG.703 at 32.064, 34.368, 44.736, or 51.840

Mbit/s (8.448 Mbit/s optional)

ECL at 6 to 52 Mbit/s

MIL-STD-188-141 at 6 to 13 Mbit/s
Symbol Rate37.5 Mbit/s maximum
Modulation/DemodulationQPSK at 1/2, 3/4, and 7/8

8PSK trellis at 2/3 and 5/6 rate (optional)

16QAM at 3/4 and 7/8 rate (optional)
Energy DispersalCCITT, V.35, and others
Forward Error CorrectionViterbi, K=7, Reed-Solomon (optional)
Data ScramblingIESS-308 (V.35)
Plesiochronous Buffer2 to 32 ms or bypass, selectable
Operation ModeDuplex, Tx only, Rx only
CompatibilityNEC 5500
Environmental and Physical
Prime Power90 to 264 VAC, 47 to 63 Hz, 200W
Size19W x 20D x 3.5H inches (2RU)

(48W x 51D x 9H cm)
Weight< 30 lbs. (13.6kg)
Temperature0 to 50°C (32° to 122°F)
Humidity< 95%, non-condensing
Modulation Specifications
Output Power-20.0 to +5.0 dBm, in 0.1 dB steps accuracy of ±0.5 dB
Output Spurious/Harmonics-55 dBc
Output Return Loss> 18 dB
Output Impedance75 Ohms 50 (Ohms optional)
Tx Frequency Stability±10 PPM standard (±0.2 PPM with external high stability option)
Data Rate6 to 52 Mbit/s, 4 rate plug-on modules
Internal Data Clock Stability±10.0 PPM standard (?? 0.2 PPM with

external high stability option)
Demodulation Specifications
Input Power:

  Desired Carrier

-45 to -25 dBm
Input Impedance75 Ohm (Optional 50 Ohm)
Input Return Loss> 18 dB
Carrier Acquisition Range±32 kHz
Output Spurious/Harmonics-55 dBc
Data Rate6 to 52 Mbit/s, 4 rate plug-on modules
Complementary Switches


1:1 Configuration (G.703)

1:1 Configuration (ECL)

1:4 Configuration (G.703)

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