DMD2050E MIL-STD-188-165A/B Compliant Universal Satellite Modem
Satellite Modems

Overview

Typical Users

The DMD2050E Satellite Modem is designed to comply with the widest possible range of U.S. Governmentand 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,
the draft standard MIL-STD-188-165B, as well as the IESS-308, IESS-309, IESS-310 & IESS–315
commercial standards.

• Government & Military
Common Applications

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 BPSK, QPSK, OQPSK,
8PSK, 8-QAM, 16-QAM and 16APSK.

• Communications

Advanced FEC and modulation capabilities are integrated with the revolutionary DoubleTalk Carrier-inCarrier bandwidth compression allowing for maximum state-of-the-art performance under all conditions.
This combination of advanced technologies enables multi-dimensional 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• Integrated Satellite

at-the-Pause• Flyaway
Communications

TerminalCommunications

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, andautomatically 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.
• Ethernet Flow Control & Quality of Service (QoS)Features• Integrated DoubleTalk Carrier-in-Carrier• Standards Compliance:• LDPC, TPC, 165B Turbo, Viterbi, Reed Solomon, Trellis & MIL-STD-188-165A (all modes)
Sequential FEC
 MIL-STD-188-165B (draft standard)• FEC rates 1/1, 5/16, 1/2, 2/3, 3/4, 7/8, 19/20 and others
 STANAG 4486 Edition 3
 OM-73• BPSK, QPSK, OQPSK, 8PSK, 8-QAM, 16-QAM, 16APSK IESS-308/309/310/314/315• Information Throughput Adaption (ITA)• Standard Data Interfaces• 2.4 kbps to 52 Mbps
 MIL-STD-188-114 (EIA-530)• 70 ± 18 MHz and 140 ± 36 MHz IF, and 950 – 2000 MHz
 EIA-613 (HSSI)
L-Band in 1 Hz steps
 Ethernet 10/100/1000Base-T (GigE)• DC input power -48 VDC option• Serial / Ethernet multiplexing capability• High-stability reference• AES-256 TRANSEC, FIPS-140-2 L2 certified• Asynchronous overhead• Key Loader Interface• Automatic Uplink Power Control

www.comtechefdata.com

Compatibility
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 eachother. Figure 2 shows the typical DoubleTalk Carrier-in-Carrier operation, where the two carriers are overlapping, thus sharing the samespectrum.

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:

A

B

B

Switching to LDPC and using a lower code rate – for example 8-QAM, LDPC
2/3 increases the total transponder bandwidth, while reducing the totaltransponder power:

ANow using DoubleTalk Carrier-in-Carrier, the second carrier can be placed over the first carrier – thereby significantly reducing the totaltransponder 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 TechnologyRedundancy
Ultra high reliability redundant configurations are supported in conjunction with our RCS-11 and RCS-20 redundancy switches. TheRCS-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 3and 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
options.

Information Throughput Adaption
In ITA mode, modems automatically communicate the maximum efficiency modulation and coding mode to be used by the distant end
modem, maximizing throughput and link availability under all conditions. Modulation and coding changes are made seamlessly, so there
is no reacquisition time or data loss when modems change parameters to maintain optimum performance.

Specifications
Modulator
Modulation
IF Tuning Range
L-Band Tuning Range
Impedance
Connector
VSWR
Output Power
Output Stability
Output Spectral Mask
Spurious
On/Off Power Ratio
Scrambler

FEC

Outer Encoder
Data Clock SourceInternal Stability

Plesiochronous Buffer
BPSK, QPSK,OQPSK,8PSK,8-QAM,
16-QAM,16APSK
70 ± 18 MHz and 140 ± 36 MHz in 1 Hz steps
950 – 2000 MHz in 1Hz steps
IF: 50 Ohm (75 Ohm optional)
L-Band: 50 Ohm
TNC: 50 Ohm (75 Ohm BNC optional) 70/140
IF
SMA: 50 Ohm, L-Band
IF < 1.5:1, L-Band < 2.0:1
0 to -40 dBm
IF: ± 0.5 dB over frequency and temperature
L-Band: ± 0.5 dB over frequency and temp
Meets MIL-188-165A or IESS- 308/309/310-55 dBc In-band (50 180 MHz, 950 to 2050MHz)-45 dBc Out-of-band> 60 dB
OM-73, CCITT V.35 or IBS
Viterbi, K = 7: 1/2, 3/4 and 7/8
Trellis:2/3
Turbo Product Code (optional)
BPSK
5/16, 21/44
QPSK/OQPSK
21/44, 3/4, 7/8
8PSK/16-QAM
3/4, 7/8
165B Turbo Codes
BPSK:
2/3, 3/4, 7/8, 19/20
QPSK: 1/2, 2/3, 3/4, 7/8, 19/20
8PSK/16APSK:
1/2, 2/3, 3/4, 7/8, 19/20
LDPC (optional)
BPSK:
1/2
QPSK/OQPSK:
1/2, 2/3, 3/4
8PSK/8-QAM:
2/3, 3/4
16-QAM: 3/4
Reed-Solomon Intelsat
Custom (N, K) Reed-Solomon
Internal, external, RX recovered-8
5 x 10 (0.05 ppm)

SizeCenteringClock0 ms to 64 ms
Automatic on overflow/underflow
Transmit, external, RX recovered or SCT (internal)

Monitor and Control
Ethernet 10Base-T/Remote RS-485/Terminal RS-232
Web browser, menu driven command line interface, SNMPv2

Terrestrial Interfaces
Standard Interfaces

MIL-STD-188-114 (EIA-530/RS-422)
EIA-613 (HSSI)
Ethernet 10/100/1000Base-T (GigE)

Environmental & Physical
100 to 240 VAC, 50 to 60 Hz,70 W maximum-48 VDC (optional)

Prime PowerOperating Temperature
Storage Temperature
Dimensions(height x width x depth)
Weight-10 to +60°C, 95% humidity, non-condensing-20 to 70°C, 99% humidity, non-condensing
1.75” x 19” x 19.25”(4.45 x 48.26 x 48.89 cm)
10.0 lbs (4.5 kg)

Available Options
How Enabled
FAST
FAST
FAST
FAST
HardwareHardware / FAST
HardwareHardwareHardwareOptionDoubleTalk Carrier-in-Carrier
TPC FEC
Sequential & TPC FEC
Sequential, TPC, & LDPC FEC
BNC or TNC 70/140 MHz IF Connectors
Key Loader Firmware & Front PanelConnector
Key Loader Device (separate unit)
Rear Panel Power Switch-48 VDC prime power

Demodulator
Demodulation
IF Tuning Range
L-Band Tuning Range
Impedance
Connector

BPSK, QPSK,OQPSK,8PSK,8-QAM,
16-QAM, 16APSK
70 ± 18 MHz and 140 ± 36 MHz in 1 Hz steps
950 – 2000 MHz in 1Hz steps
IF: 50 Ohm (75 Ohm optional)
L-Band: 50 Ohm
TNC: 50 Ohm, (75 Ohm BNC optional)
SMA: 50 Ohm, L-Band

VSWR

IF < 1.5:1, L-Band < 2.0:1

Output Spectral Mask

Meets MIL-188-165A or IESS- 308/309/310

Input Level
Total Input Power
FEC
Outer Decoder
OptionsDescrambler
Acquisition Range
Reacquisition Range
Sweep Delay Value+10 to -55 dBm symbol rate (SR) > 3.2 Msps
+10 to -55 -10log10(3.2/SR), < 3.2 Msps
+20 dBm or +40 dBc (the lesser)
Same as modulator
Reed-Solomon Intelsat
Custom (N, K) Reed-Solomon (optional)
OM-73, CCITT V.35 or IBS
Programmable ± 1 kHz to ± 255 kHz
Programmable ± 1 Hz to 25 kHz
100 ms to 9000 seconds in 100 ms steps

Key Loader Device

Example Modes and Performance
Mod / FEC

Eb/No Guaranteed (Typical)

CodeRate

BW Eff.
(bit/sym)

10-510-610-710-8

Data Rate Range[kbps]

Legacy Modes
BPSK VITQPSK VITQPSK VITQPSK VITQPSK VIT R-S
QPSK VIT R-S
QPSK VIT R-S
QPSK SEQQPSK SEQQPSK SEQ
8PSK TRE
8PSK TRE R-S
TPC Modes
BPSK TPCBPSK TPCQPSK TPCQPSK TPCQPSK TPC

1/2
1/2
3/4
7/8
1/2
3/4
7/8
1/2
3/4
7/8
2/3
2/3

0.50
1.00
1.50
1.75
0.92
1.38
1.61
1.00
1.50
1.75
2.00
1.84

5.5 (5.1)
5.5 (5.1)
6.8 (6.3)
7.9 (7.2)
3.8 (3.4)
5.4 (4.7)
6.5 (6.0)
5.6 (5.1)
6.1 (5.6)
6.9 (6.4)
8.2 (6.4)
6.3 (5.4)

6.1 (5.7)
6.1 (5.7)
7.6 (7.0)
8.6 (7.9)
4.1 (3.6)
5.6 (4.9)
6.7 (6.4)
5.9 (5.4)
6.5 (6.1)
7.4 (6.9)
9.0 (7.2)
6.5 (5.6)

6.7 (6.2)
6.7 (6.2)
8.3 (7.7)
9.3 (8.6)
4.2 (3.8)
5.8 (5.1)
6.9 (6.7)
6.3 (5.8)
7.0 (6.5)
7.9 (7.4)
9.8 (8.1)
6.7 (5.8)

7.4 (6.8)
7.4 (6.8)
8.9 (8.4)
10.2 (9.4)
4.4 (4.0)
6.0 (5.3)
7.2 (7.1)
6.7 (6.2)
7.4 (6.9)
8.4 (7.9)
10.4 (8.9)
6.9 (6.1

2.4 – 14,100
4.8 – 28,300
7.2 – 42,400
8.4 – 49,500s
4.8 – 25,100
7.2 – 37,700
7.8 – 44,000
4.8 – 2,048
7.2 – 2,048
8.4 - 2,048
9.6 – 52,000
8.9 – 52,000

5/16
21/44
21/44
3/4
7/8

0.31
0.48
0.95
1.50
1.75

8PSK TPC

3/4

2.25

8PSK TPC

7/8

2.63

16-QAM TPC

3/43.00

16-QAM TPC
165B Turbo Modes
BPSK 165B
BPSK 165B
BPSK 165B
BPSK 165B
QPSK 165B
QPSK 165B
QPSK 165B
QPSK 165B
QPSK 165B
8PSK 165B
8PSK 165B
8PSK 165B
8PSK 165B
8PSK 165B
16APSK 165B
16APSK 165B
16APSK 165B
16APSK 165B
16APSK 165B
LDPC Modes
BPSK LDPCQPSK LDPCQPSK LDPCQPSK LDPC
8-QAM LDPC
8-QAM LDPC
16-QAM LDPC

7/8

3.50

2.5 (2.3)
2.7 (2.4)
2.7 (2.4)
3.6 (3.2)
4.2 (3.9)
6.0 (5.6)
7.1 (6.7)
6.9 (6.5)
7.3 (6.9)
7.0 (6.7)
7.5 (7.1)
8.0 (7.6)

2.7 (2.5)
2.9 (2.6)
2.9 (2.6)
3.8 (3.4)
4.3 (4.0)
6.3 (5.8)
7.2 (6.8)
7.0 (6.6)
7.4 (7.0)
7.4 (7.1)
7.7 (7.4)
8.1 (7.7)

2.9 (2.7)
3.1 (2.8)
3.1 (2.8)
4.1 (3.7)
4.4 (4.1)
6.5 (6.0)
7.3 (6.9)
7.1 (6.7)
7.5 (7.1)
7.8 (7.5)
7.9 (7.6)
8.2 (7.8)

3.1 (2.9)
3.3 (3.0)
3.3 (3.0)
4.4 (4.0)
4.5 (4.2)
6.7 (6.3)
7.4 (7.0)
7.2 (6.8)
7.6 (7.2)
8.2 (7.9)
8.3 (8.0)
8.3 (7.9)

2.4 – 8,844
2.4 – 13.506
4.8 – 20,000
7.2 – 20,000
8.4 – 20,000
10.8 – 20,000
20,000 – 52,000
12.6 – 20,000
20,000 – 52,000
14.4 – 20,000
20,000 – 52,000
16.84 – 20,000

2/3
3/4
7/8
19/20
1/2
2/3
3/4
7/8
19/20
1/2
2/3
3/4
7/8
19/20
1/2
2/3
3/4
7/8
19/20

0.656
0.737
0.860
0.933
0.982
1.307
1.464
1.710
1.856
1.468
1.9532.192
2.551
2.767
1.953
2.593
2.910
3.382
3.670

2.6 (2.2)
3.1 (2.7)
4.2 (3.8)
5.9 (5.5)
1.8 (1.4)
2.6 (2.2)
3.4 (3.0)
4.0 (3.6)
5.9 (5.5)
3.5 (3.1)
5.0 (4.6)
6.0 (5.6)
7.2 (6.8)
9.5 (9.1)
4.7 (4.3)
6.5 (6.0)
7.4 (7.0)
8.5 (8.4)
10.5 (10.2)

2.65 (2.25)
3.15 (2.75)
4.3 (3.9)
6.0 (5.6)
1.9 (1.5)
2.7 (2.3)
3.5 (3.1)
4.1 (3.7)
6.0 (5.6)
3.6 (3.2)
5.1 (4.7)
6.1 (5.7)
7.3 (6.9)9.6 (9.2)
4.9 (4.4)
6.6 (6.1)
7.5 (7.1)
8.7 (8.5)
10.7 (10.4)

2.7 (2.3)
3.2 (2.8)
4.4 (4.0)
6.2 (5.7)
2.0 (1.6)
2.8 (2.4)
3.6 (3.2)
4.2 (3.8)
6.1 (5.7)
3.7 (3.3)
5.2 (4.8)
6.2 (5.8)
7.5 (7.1)
9.7 (9.3)
4.9 (4.5)
6.7 (6.2)
7.6 (7.3)
8.8 (8.6)
10.8 (10.5)

2.8 (2.4)
3.3 (2.9)
4.5 (4.1)
6.2 (5.8)
2.1 (1.7)
2.9 (2.5)
3.7 (3.3)
4.3 (3.9)
6.2 (5.8)
3.9 (3.5)
5.3 (4.9)
6.3 (5.9)
7.9 (7.5)
9.8 (9.4)
5.0 (4.6)
6.7 (6.3)
7.7 (7.3)
8.9 (8.7)
10.9 (10.6)

64 – 20,000
64 – 22,500
64 – 26,250
64 – 28,500
64 – 30,000
64 – 40,000
64 – 45,000
64 – 52,000
64 – 52,000
256 – 45,000
256 – 52,000
256 – 52,000
256 – 52,000
256 – 52,000
256 – 52,000
256 – 52,000
256 – 52,000
256 – 52,000
256 – 52,000

1/2
1/22/3
3/4
2/3
3/4
3/4

0.50
1.00
1.33
1.50
2.00
2.25
3.00

2.0 (1.7)
2.0 (1.7)
2.3 (2.0)
3.0 (2.6)
4.6 (4.2)
5.6 (5.2)
6.8 (6.2)

2.1 (1.8)
2.1 (1.8)
2.4 (2.1)
3.1 (2.7)
4.7 (4.3)
5.7 (5.3)
6.9 (6.4)

2.2 (1.9)
2.2 (1.9)
2.5 (2.2)
3.2 (2.8)
4.8 (4.4)
5.8 (5.4)
7.0 (6.6)

2.3 (2.0)
2.3 (2.0)
2.6 (2.3)
3.3 (3.0)
4.9 (4.5)
5.9 (5.5)
7.1 (6.8)

2.4 – 13.506
4.8 – 20,000
6.4 – 20,000
7.2 – 20,000
9.6 – 20,000
10.8 – 20,000
14.4 – 20,0002114 West 7th Street, Tempe, Arizona 85281 USA
Voice: +1.480.333.2200 ● Fax: +1.480.333.2540 ● Email: sales@comtechefdata.com
See all of Comtech EF Data’s Patents and Patents Pending at http://patents.comtechefdata.com
Comtech EF Data reserves the right to change specifications of products described in this document at any time without notice and without obligation to notify any person of such changes. Information inthis document may differ from that published in other Comtech EF Data documents. Refer to the website or contact Customer Service for the latest released product information© 2013 Comtech EF Data
ds-dmd2050E.docx
9/9/2013