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Comtech EF Data SDM-300A Variable Rate Satellite Modem

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  • Data Rates 2.4 kbits to 5 Mbits
  • Fully Accessible System Topology
  • INTELSAT Business Services (IBS)
  • Drop and Insert (D&I)


SKU:

System Specifications (Fully Enhanced)
Operating Frequency Range50 to 180 MHz, in 1 Hz steps
Digital Interface (Standard)EIA-232, EIA-422, and V./35 (25-pin D)
Digital Data Rate2.4 kbit/s to 5 Mbit/s, in 1 bit/s steps

64 kbit/s to 5 Mbit/s (8PSK)
Symbol Rate4.8 kbit/s to 2.5 Mbit/s
Modulation and Coding

  Viterbi(K=7)

  Sequential

  Concatenated Viterbi and Reed-Solomon

  Turbo

  Uncoded





BPSK 1/2

QPSK/OQPSK 1/2, 3/4, and 7/8

BPSK 2/3 TCM

BPSK 1/2

QPSK/OQPSK 1/2, 3/4, and 7/8

BPSK 2/3 TCM

BPSK 21/44, 5/16

QPSK / OQPSK 3/4

BPSK 3/4
Plesiochronous Buffer2 to 99 ms, in 2 ms steps
Data ScramblingIESS-308 (V.35), IESS-309, or None
External Reference Input1, 5, 10, or 20 MHz
Agency ApprovalsCE Mark
Modulation Specifications
Output Power-5 to -30 dBm, adjustable in 0.1 dB steps
Output Spurious< -55 dBc, 0 to 500 MHz (4 kHz band)
Output Return Loss> 20 dB
Output Impedance75 Ohm
Data Clock SourceInternal or External
Output Frequency Stability±10 PPM
Demodulation Specifications
Input Power:

  Desired Carrier

  Maximum Composite



-30 to -55 dBm

-5 dBm to +40 dBc
Input Impedance75 Ohm (Optional 50 Ohm)
Input Return Loss> 20 dB
Carrier Acquisition Range± 35 kHz from 100 Hz to 35 kHz
Acquisition Time< 1 second for 64 kbps 1/2 rate
Clock Acquisition Range±100 PPM
AGC Output0 to 10 V at 10 mA maximum
Environmental and Physical
Prime Power, AC90 to 264 VAC, 47 to 63 Hz, 30W

38 to 64 VDC, 40W
Size1.75H x 19.0W x 15.7D inch (1 RU)

(4.4H x 48 W x 40 D cm)
Weight< 11 lbs. (4.9 kg)
Temperature0 to 50°C (32° to 122°F) Operating

-40° to +70°C (-40° to +158°F) Storage
Humidity< 95%, non-condensing
ESC Specifications
IDR:

  Voice Orderwire

  Data Orderwire

  Backward Alarm

  Total Overhead



2 ADPCM (input: 4-wire VF), or 64 kbit/s data

8 kbit/s (EIA-422 interface)

Form C contacts (4)

96 kbit/s
IBS:

  ASYNC Data Orderwire

  Backward Alarm

  Total Overhead


1/2000 x data rate

Form, C contacts

1/15 x data rate
Drop and Insert:

  Interface

  Data Rate

  N x 64 kbit/s



g.703

T1 or E1

N = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30

2.048 Mbit/s (E1_IBS)

1.544 Mbit/s (T1_IBS)

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