UAE: +971 6 55 222 55 | USA: +1 (833) VSAT 123
Comtech EF Data DMD20 LBST L-Band Satellite Modem
| Modulator | |
|---|---|
| Modulation | BPSK, QPSK, and OQPSK (8PSK, 16QAM Optional) |
| L-Band Tuning Range | 950 to 2050 MHz in 1 Hz Steps |
| Impedance | 50 Ohm |
| Connector | Female Type N |
| Return Loss | 10 dB Minimum |
| Output Power | 0 to -25 dBm |
| Output Accuracy | ±1.0 dB Over Frequency and Temperature |
| Output Spectrum | Meets IESS 308/309/310 Power Spectral Mask (DVB-S optional) |
| Spurious In-Band Out-of-Band | -55 dBc -45 dBc |
| Harmonics | -45 dBc |
| On/Off Power Ratio | >60 dB |
| Scrambler | CCITT V.35 or IBS (Others Optional) |
| FEC | |
| Viterbi, K=7 at 1/2, 3/4 and 7/8 Trellis 2/3 Turbo Product Code (Optional) Per IESS 315 BPSK 21/44 QPSK/OQPSK 1/2, 3/4, 7/8 8PSK/16QAM 3/4, 7/8 Legacy Turbo Rates: 0.495, 0.793 | |
| Outer Encoder Options | Reed-Solomon INTELSAT (DVB Optional) Custom (N,K) Reed-Solomon (Optional) |
| Data Clock Source | Internal, External, Rx Recovered |
| Internal Stability | 5 x 10-8 |
| BUC DC Voltage | BUC 24 V@4 A Maximum BUC 48 V (Optional) |
| BUC Reference | 10 MHz, 3 dBm ± 3 dB |
| BUC FSK | 710/590 KHz Nominal (Optional) |
| Demodulator | |
| Demodulation | BPSK, QPSK, and OQPSK (8PSK, 16QAM Optional) |
| L-Band Tuning Range | 950 to 2050 MHz in 1 Hz Steps |
| Impedance | 50 Ohm |
| Connector | Type N Female |
| Return Loss | 10 dB Minimum |
| Spectrum | INTELSAT IESS 308/309/310 Compliant (DVB-S optional) |
| Input Level | 10 x log (Symbol Rate) - 100, ±12dBm |
| Total Input Power | -10 dBm or +40 dBc (the lesser) @ 64 Kbps, Symbol Rate Dependent |
| FEC | |
| Viterbi, K=7 at 1/2, 3/4 and 7/8 Rate, Rate Sequential 1/2, 3/4, 7/8 (Optional), Trellis 2/3, Turbo Product Code (Optional) Per IESS 315, BPSK 21/44, Custom (N,K) Reed-Solomon, QPSK/OQPSK 1/2, 3/4, 7/8, 8PSK/16QAM 3/4, 7/8, Legacy Turbo Rates: 0.495, 0.793, | |
| Decoder Options | Reed-Solomon INTELSAT (DVB-S Optional) |
| Descrambler | CCITT V.35 or IBS (Others Optional) |
| Acquisition Range | Programmable ±1 kHz to ± 255 kHz |
| Sweep Delay Value | 100 msec to 6000 sec. in 100 msec Steps |
| LNB Reference | 10 MHz, 3 dBm ± 3 dB |
| LNB DC Voltage | 13, 15, 18, 20 VDC (750 mA Maximum), Programmable |
| Plesiochronous Buffer | |
| Size | 0 ms to 64 msec |
| Centering | Automatic on Underflow or Overflow |
| Centering Modes | IBS: Integral Number of Frames IDR: Integral Number of Multi Frames |
| Clock | Transmit, External, Rx Recovered or SCT (Internal) |
| Monitor and Control | |
| Remote RS-485/Terminal RS-232/Ethernet 10 Base-T, Web Browser | |
| FSK | CODAN/TERRASAT Smart BUCs |
| DMD20 LBST Drop and Insert (Optional) | |
| Terrestrial Data | 1.544 Mbps or 2.048 Mbps, G.732/733 |
| Line Coding | AMI or B8ZS for T1 and HDB3 for E1 |
| Framing | D4, ESF and PCM30 (PCM 30C) or PCM31 (PCM 31C) for E1 |
| Time Slot Selection | n x 64 Contiguous or Arbitrary Blocks for Drop or Insert |
| EFFICIENT D&I Closed Network, Satellite Overhead 0.4% | |
| Time Slots | 1-31 Any Combination |
| Terrestrial Interfaces | |
| DVB ASI/SPI, HSSI, Ethernet 4 Port 10/100 Base-T, HSSI/Ethernet 4 Port 10/100 Base-T, HSSI/G703 T1/E1/T2/E2 | |
| DoubleTalk Carrier-in-Carrier | |
| Delay Range | 0 to 300 ms |
| Power Spectral Density Ratio (Interferer to Desired) | BSPK/OQPSK/QPSK/8-PSK/8-QAM: -7 dB to +10 dB 16-QAM: -7 dB to +7 dB |
| Maximum Symbol Rate Ratio | 3:1 (TX:RX or RX:TX) |
| Eb/No Degradation | 0 dB Power spectral density ratio BPSK/QPSK/OQPSK: 0.6 dB 8-QAM: 0.7 dB 8-PSK: 0.8 dB 16-QAM: 0.9 dB |
| Satellite Restrictions | Satellite in “loop-back” mode (i.e., the transmit station can receive itself) “Non-processing” satellite (i.e., does not demodulate or remodulate the signal) |
| IDR/ESC Interface (Optional) | |
| G.703 T1 (DSX1) | 1.544 Mbps, 100 Ohm Balanced, AMI and B8ZS Line Codes |
| G.703 E1 | 2.048 Mbps, 75 Ohm Unbalanced and 120 Ohm Balanced, HDB3 |
| G.703 T2 (DSX2) | 6.312 Mbps, 75 Ohm Unbalanced, B8ZS Line Code and 110 Ohm Balanced, B6ZS Line Code |
| G.703 E2 | 8.448 Mbps, 75 Ohm BNC, Unbalanced, HDB3 Line Code |
| IBS/Synchronous Interface (Standard) | |
| RS-422/-530 | All Rates, Differential, Clock/Data, DCE |
| ITU V.35 | All Rates, Differential, Clock/Data, DCE |
| RS-232 | (DCE up to 200 Kbps) |
| Environmental | |
| Prime Power | 100 to 240 VAC, 50 to 60 Hz, 150 Watts Maximum with 10 W BUC |
| Operating Temperature | 0 to 50° C, 95% Humidity, Non-Condensing |
| Storage Temperature | -20 to 70°C, 99% Humidity, Non-Condensing |
| Physical | |
| Size | 19”W x 19.25”D x 1.75”H (48.26 x 48.89 x 4.45 cm) |
| Weight | 8.5 pounds (3.83 kg) |
Comtech EF Data DMD20 LBST L-Band Satellite Modem Datasheets