Comtech Radyne DMD20 16-QAM Universal Satellite Modem
L-Band and 70/140 MHz IF Operation, 2.4 kbps to 20 Mbps, 1 kbps steps
DMD20 16-QAM Universal Satellite Modem
The Comtech Radyne DMD20 Satellite Modem breaks new ground in flexibility, operation and cost. With standards including IDR, IBS and DVB, and covering data rates up to 20 Mbps, this 1RU duplex modem covers virtually all your Satellite IP, Telecom, Video and Internet applications. Switch between spur-free 70/140 MHz operation and L-Band without any configuration changes. It's all in the same box!
Comtech DoubleTalk Carrier In Carrier
DMD20 now offers DoubleTalk® Carrier-in-Carrier® bandwidth compression. DoubleTalk Carrier-in-Carrier, based on patented “Adaptive Cancellation” technology, allows transmit and receive carriers of a duplex link to share the same transponder space. DoubleTalk Carrier-in-Carrier is complementary to all advances in
modem technology, including advanced FEC and modulation techniques. As these technologies approach theoretical limits of power and bandwidth efficiency, DoubleTalk Carrier-in-Carrier utilizing advanced signal processing techniques provides a new dimension in bandwidth and power efficiency.
The extensive list of software options allows for budgeting the modem for today's needs while covering tomorrow's plans. These options can be purchased and then activated in seconds via the front panel. Additional hardware options like Turbo Product Code (TPC), Low Density Parity Check Code (LDPC), interface expansion, high-stability and DC operation complete the modem's dynamic feature coverage.
Stock this modem at its minimum configuration (and cost) locally for immediate distribution. Then configure on-site, allowing huge savings in time and dollars with just-in-time feature installation.
Remote Control
The DMD20's impressive remote accessibility surpasses all others in the field. Remote control via the RLLP (Radyne Link Level Protocol), Ethernet 10Base-T (SNMP and Web browser) includes control of all the modem's features plus software maintenance. Additionally, the two-line backlit LCD can be supplemented with terminal software running on a PC or laptop. The modem now presents its entire monitor and control functions on the big screen.
Supported by an extensive line of redundancy switches, converters, encoders and decoders, the DMD20 can be built into any satellite requirement. The DMD20 is compatible with DMD15, DMD50, CM701, MD2401 and CDM-600.
Features
DoubleTalk Carrier-in-Carrier bandwidth compression BPSK/QPSK/OQPSK/8PSK/8-QAM/16-QAM operation 2.4 kbps to 20 Mbps, 1 bps steps FEC - Viterbi, Reed-Solomon, Sequential, Trellis, TPC, LDPC Configuration, monitor and control features fully user-programmable Excellent spurious performance Fully compliant with IESS-308/309/310/314/315 Optional DVB to EN301-210 and EN300-421 Industry-standard universal interface module Fast acquisition 50 to 90 MHz and 100 to 180 MHz IF, and 950 to 2050 MHz L-Band in 1 Hz steps Standard features include: Reed-Solomon, asynchronous overhead, satellite control channel and automatic uplink power control
Hardware Options
DoubleTalk Carrier-in-Carrier
Turbo FEC
LDPC FEC
Sequential FEC
DC input power 48 VDC
High-stability reference
Software Options
Data rate upgrades
L-Band operation
IDR, IBS
8PSK/8-QAM
16-QAM
Drop and insert
DVB-S
Interface Options
Ethernet 10/100
HSSI interface
HSSI/Ethernet
HSSI/G703 interface
DVB ASI/SPI interface
G703/IDR/ESC
Specifications
DMD20 BER Performance Guaranteed (Typical) at BERs shown:
Modulation/FEC Code Rate 1 x 10-5 1 x 10-6 1 x 10-7 1 x 10-8 Data Rate Range
BPSK VIT 1/2 5.5 (5.1) 6.1 (5.7) 6.7 (6.2) 7.4 (6.8) 2.4 kbps - 5.0 Mbps
QPSK VIT 1/2 5.5 (5.1) 6.1 (5.7) 6.7 (6.2) 7.4 (6.8) 4.8 kbps - 10.0 Mbps
QPSK VIT 3/4 6.8 (6.3) 7.6 (7.0) 8.3 (7.7) 8.9 (8.4) 7.2 kbps - 15.0 Mbps
QPSK VIT 7/8 7.9 (7.2) 8.6 (7.9) 9.3 (8.6) 10.2 (9.4) 8.4 kbps - 17.5 Mbps
QPSK VIT RS 1/2 3.8 (3.4) 4.1 (3.6) 4.2 (3.8) 4.4 (4.0) 4.8 kbps - 8.88 Mbps
QPSK VIT RS 3/4 5.4 (4.7) 5.6 (4.9) 5.8 (5.1) 6.0 (5.3) 7.2 kbps - 13.33 Mbps
QPSK VIT RS 7/8 6.5 (6.0) 6.7 (6.4) 6.9 (6.7) 7.2 (7.1) 7.8 kbps - 15.55 Mbps
QPSK SEQ 1/2 5.6 (5.1) 5.9 (5.4) 6.3 (5.8) 6.7 (6.2) 4.8 kbps - 2.048 Mbps
QPSK SEQ 3/4 6.1 (5.6) 6.5 (6.1) 7.0 (6.5) 7.4 (6.9) 7.2 kbps - 2.048 Mbps
QPSK SEQ 7/8 6.9 (6.4) 7.4 (6.9) 7.9 (7.4) 8.4 (7.9) 8.4 kbps - 2.048 Mbps
QPSK TPC 1/2 2.7 (2.4) 2.9 (2.6) 3.1 (2.8) 3.3 (3.0) 4.8 kbps - 9.54 Mbps
QPSK TPC 3/4 3.6 (3.2) 3.8 (3.4) 4.1 (3.7) 4.4 (4.0) 7.2 kbps - 15.0 Mbps
QPSK TPC 7/8 4.2 (3.9) 4.3 (4.0) 4.4 (4.1) 4.5 (4.2) 8.4 kbps - 17.5 Mbps
8PSK TRE 2/3 7.8 (6.4) 8.7 (7.2) 9.5 (8.1) 10.2 (8.9) 9.6 kbps - 20.0 Mbps
8PSK TRE RS 2/3 5.8 (5.4) 6.2 (5.6) 6.5 (5.8) 6.7 (6.1) 8.9 kbps - 18.3 Mbps
8PSK TPC 3/4 6.0 (5.6) 6.2 (5.8) 6.4 (6.0) 6.8 (6.3) 10.8 kbps - 20.0 Mbps
8PSK TPC 7/8 6.9 (6.5) 7.0 (6.6) 7.1 (6.7) 7.2 (6.8) 12.6 kbps - 20.0 Mbps
16-QAM VIT 3/4 10.7 (9.9) 11.5 (10.7) 12.4 (11.6) 13.3 (12.5) 14.4 kbps - 20.0 Mbps
16-QAM VIT 7/8 11.9 (11.1) 12.7 (11.9) 13.5 (12.7) 14.3 (13.5) 16.8 kbps - 20.0 Mbps
16-QAM VIT RS 3/4 8.9 (8.3) 9.1 (8.6) 9.3 (8.8) 9.5 (9.1) 13.3 kbps - 20.0 Mbps
16-QAM VIT RS 7/8 10.3 (9.9) 10.5 (10.2) 10.8 (10.4) 11.0 (10.7) 15.5 kbps - 20.0 Mbps
16-QAM TPC 3/4 7.0 (6.7) 7.4 (7.1) 7.8 (7.5) 8.2 (7.9) 14.4 kbps - 20.0 Mbps
16-QAM TPC 7/8 8.0 (7.6) 8.1 (7.7) 8.2 (7.8) 8.3 (7.9) 16.84 kbps - 20.0 Mbps
Modulator
Modulation BPSK, QPSK, and OQPSK (8PSK, 8-QAM & 16-QAM optional)
IF Tuning Range 50 to 90 and 100 to180 MHz in 1 Hz steps
L-Band Tuning Range 950 to 2050 MHz in 1 Hz steps
Impedance IF: 75 Ohm (50 Ohm optional)
L-Band: 50 Ohm
Connector BNC: 75 Ohm
SMA: 50 Ohm, L-Band
Return Loss IF: 20 dB minimum
L-Band: 14 dB minimum
Output Power 0 to -25 dBm
Output Stability IF: ±0.5 dB Over frequency and temperature
L-Band: ±1.0 dB Over frequency and temperature
Output Spectrum Meets IESS-308/309/310/DVB-S
Power spectral mask
Spurious
-55 dBc In-band (50 to 90 MHz, 100 to 180 MHz,
950 to 2050 MHz)
-45 dBc Out-of-band
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
Sequential 1/2, 3/4 and 7/8 (optional)
Trellis 2/3
Turbo Product Code (optional)
BPSK: 21/44
QPSK/OQPSK: 1/2 (21/44), 3/4, 7/8
8PSK/8-QAM, 16-QAM: 3/4, 7/8
Legacy Turbo Rates: 0.495, 0.793 (optional)
LDPC (optional)
BPSK: 1/2
QPSK/OQPSK: 1/2, 2/3, 3/4
8PSK/8-QAM: 2/3, 3/4
16-QAM: 3/4
Outer Encoder Options Reed-Solomon Intelsat (DVB-S optional)
Custom (N, K) Reed-Solomon (optional)
Data Clock Source Internal, external, RX recovered
Internal Stability 1 x 10-6 Typical (optional to 5 x 10-8)
Demodulator
Demodulation BPSK, QPSK, and OQPSK (8PSK, 8-QAM & 16-QAM optional)
IF Tuning Range 50 to 90 and 100 to 180 MHz in 1 Hz steps
L-Band Tuning Range 950 to 2050 MHz in 1 Hz steps
Impedance IF: 75 Ohm (50 Ohm optional)
L-Band: 50 Ohm
Connector BNC: 75 Ohm
SMA: 50 Ohm (L-Band)
Return Loss IF: 20 dB minimum
L-Band: 14 dB minimum
Spectrum Intelsat IESS-308/309/310/DVB-S compliant
Input Level 10 x log (symbol rate) – 100, ±12 dB
Total Input Power -10 dBm or +40 dBc (the lesser) @ 256 kbps
FEC
Viterbi, K=7 at 1/2, 3/4 and 7/8,
Sequential 1/2, 3/4 and 7/8 (optional)
Trellis 2/3
Turbo Product Code (optional)
BPSK: 21/44
QPSK/OQPSK: 1/2 (21/44), 3/4, 7/8
8PSK/8-QAM, 16-QAM: 3/4, 7/8
Legacy Turbo Rates: 0.495, 0.793 (optional)
LDPC (optional)
BPSK: 1/2
Q-PSK/OQPSK: 1/2, 2/3, 3/4
8PSK/8-QAM: 2/3, 3/4
16-QAM: 3/4
Decoder Options Reed-Solomon Intelsat (DVB-S_optional)
Custom (N, K) Reed-Solomon (optional)
Descrambler CCITT V.35 or IBS (Others optional)
Acquisition Range Programmable ±1 kHz to ± 255 kHz
Sweep Delay Value 100 msec to 6000 seconds in 100 msec steps
Typical Users
Cellular Backhaul
Government & Military
Common Applications
Cellular Backhaul
G.703 Trunking
IP Trunking
