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DMD2050E MIL-STD-188-165A/STANAG 4486 Edition 3
Compliant Universal Satellite Modem
Satellite Modems
Typical Users
The DMD2050E Satellite Modem is designed to comply with the widest possible range of U.S.
Government and commercial standards and is compatible with the largest number of satellite
modems in the industry. It is fully compliant with MIL-STD-188-165A (all terminal types), fully
complies with STANAG 4486 Edition 3, as well as the IESS-308, IESS-309, IESS-310 & IESS–315
commercial standards.
The DMD2050E provides highly advanced and bandwidth efficient forward error correction (FEC).
Advanced FEC options include Low Density Parity Check (LDPC), Turbo Product Codes (TPCs) and
165B Turbo Codes. Legacy support for Viterbi, Trellis, Concatenated Viterbi Reed-Solomon, and
Sequential FEC are also included. A complete range of modulation types is supported including
• Government & Military
Common Applications
• Communications at-the-Pause
• Flyaway Communications
• Integrated Satellite Terminal
Advanced FEC and modulation capabilities are integrated with the revolutionary DoubleTalk  Carrier-in-Carrier bandwidth compression
allowing for maximum state-of-the-art performance under all conditions. This combination of advanced technologies enables multidimensional optimization, allowing satellite communications users to:
 Minimize required satellite bandwidth
 Maximize throughput without using additional transponder resources
 Maximize availability (margin) without using additional transponder resources
 Enable use of a smaller BUC/HPA and/or antenna
 Or, a combination of the above to meet specific mission needs
The DMD2050E also supports Information Throughput Adaptation (ITA). Also referred to as Adaptive Coding and Modulation (ACM), ITA
enables modems on each side of a point-to-point link to use the modulation and coding combination that maximizes throughput, and
automatically adapts the optimum operating point as conditions (such as weather) change.
Data rates range from 2.4 kbps to 52 Mbps and symbol rates from 4.8 ksps to 30 Msps. The modem provides standard
MIL-STD-188-114 (EIA-530 / RS-422), and EIA-613 (HSSI) serial interfaces and 10/100/1000Base-T Gigabit Ethernet interfaces. A dual
IF interface supports low IF (52-88, 104-176 MHz), and L-Band (950-2000 MHz) frequency ranges.
 Standards Compliance:
 MIL-STD-188-165A (all modes)
 STANAG 4486 Edition 3
 OM-73
 IESS-308/309/310/314/315
 Standard Data Interfaces
 MIL-STD-188-114 (EIA-530)
 EIA-613 (HSSI)
 Ethernet 10/100/1000Base-T (GigE)
 Serial / Ethernet multiplexing capability
 AES-256 TRANSEC, FIPS-140-2 L2 certified
 Key Loader Interface
 Ethernet Flow Control & Quality of Service (QoS)
 Integrated DoubleTalk Carrier-in-Carrier
 LDPC, TPC, 165B Turbo, Viterbi, Reed Solomon, Trellis &
Sequential FEC
 FEC rates 1/1, 5/16, 1/2, 2/3, 3/4, 7/8, 19/20 and others
 Information Throughput Adaption (ITA)
 2.4 kbps to 52 Mbps
 70 ± 18 MHz and 140 ± 36 MHz IF, and 950 – 2000 MHz
L-Band in 1 Hz steps
 DC input power -48 VDC option
 High-stability reference
 Asynchronous overhead
 Automatic Uplink Power Control
The DMD2050E is interoperable with the DMD2050, DMD20, DMD50, DMD1050, SLM-5650/5650A, CDM-625, CDM-600/600L, CDM570/570L, as well as many other Comtech satellite modems. It is also compatible with modems from other vendors that are compliant
with MIL-STD-188-165A/B or IESS-308/309/310 open standards.
Doubletalk Carrier-in-Carrier
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. Figure 1 shows the typical full duplex satellite link, where the two carriers are adjacent to each
other. Figure 2 shows the typical DoubleTalk Carrier-in-Carrier operation, where the two carriers are overlapping, thus sharing the same
Figure 1
Figure 2
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 utilizes
advanced signal processing techniques to provide a new dimension in bandwidth and power efficiency.
DoubleTalk Carrier-in-Carrier can be used to save transponder bandwidth and/or transponder power thereby allowing successful
deployment in bandwidth-limited as well as power-limited scenarios.
The following example illustrates the typical process for implementing DoubleTalk Carrier-in-Carrier in a power-limited scenario:
The conventional link is using 8PSK, TPC 3/4:
Switching to LDPC and using a lower code rate – for example 8-QAM, LDPC
2/3 increases the total transponder bandwidth, while reducing the total
transponder power:
Now using DoubleTalk Carrier-in-Carrier, the second carrier can be placed over the first carrier – thereby significantly reducing the total
transponder bandwidth and total transponder power when compared to the original side-by-side 8PSK, TPC 3/4 carriers:
Carrier-in-Carrier® is a Registered Trademark of Comtech EF Data
DoubleTalk® is a Registered Trademark of Raytheon Applied Signal Technology
Ultra high reliability redundant configurations are supported in conjunction with our RCS-11 and RCS-20 redundancy switches. The
RCS-11 can be configured to support 1:1 redundancy for any DMD-2050E configuration. The RCS-20 provides the same functionality for
M:N redundant system architectures.
TRANSEC / Key Loader
A transmission security (TRANSEC) module provides bulk AES-256 encryption/decryption in accordance with STANAG 4486 Edition 3
and the Federal Information Processing Standards (FIPS)-140-2 Level 2 specifications. A key loader interface is available to reduce
configuration complexity and simplify TRANSEC key management (Key Loader device is sold separately).
Flow Control & QoS
PPPoE flow control is supported on the Ethernet interfaces. QoS is also supported, with both strict priority and fair weighted queuing