Comtech EF Data CDM-570A/L Satellite Modems

CDM-570A/L Satellite Modems
Satellite Modems
The CDM-570A and the CDM-570AL are our next generation satellite modems that provide
industry-leading performance and flexibility in a 1 RU package at a very competitive price.
With support for VersaFEC® low latency LDPC Forward Error Correction (FEC), the
revolutionary DoubleTalk® Carrier-in-Carrier® bandwidth compression, and optimized transmit
filter rolloffs, the CDM-570A and CDM-570AL provide significant savings under all conditions.
This combination of advanced technologies enables multi-dimensional optimization, allowing
satellite communications users to:
Minimize operating expenses (OPEX)
Maximize throughput without using additional transponder resources
Maximize availability (margin) without using additional transponder resources
Minimize capital expenses (CAPEX) by allowing a smaller BUC/amplifier and/or antenna
Or, a combination to meet specific business needs
The modems are available with 70/140 MHz or L-Band IF and EIA-530/-422, V.35, sync EIA232 and G.703 T1/E1 data interfaces.
Typical Users
Internet Service Providers
Satellite Service Providers
Offshore & Maritime
Mobile Operators
Common Applications
• Enterprise Networks
• Offshore & Maritime
• Mobile Backhaul
• Communications on-the-Move
• Disaster Recovery & Emergency
• Satellite News Gathering
DoubleTalk Carrier-in-Carrier bandwidth compression
Carrier-in-Carrier Automatic Power Control (CnC-APC)
VersaFEC low latency LDPC (Constant Coding & Modulation Mode)
5%, 10%, 15%, 20%, 25% and 35% Transmit Filter Rolloff
Data rate range from 2.4 kbps to 10.239 Mbps
CDM-570A: 50 to 90 or 100 to 180 MHz IF range
CDM-570AL: 950 to 2250 MHz IF range
Modulation types: BPSK, QPSK, OQPSK, 8PSK, 8-QAM, 16-QAM
Forward Error Correction (FEC) choices include VersaFEC, Turbo Product Code (TPC), Viterbi, Reed-Solomon, and Trellis Coded
Modulation (TCM)
Data Interfaces: EIA-422/530, V.35, G.703 T1/E1, sync EIA-232
Standards based management via SNMP, Web, or Telnet
G.703 clock extension
Automatic Uplink Power Control (AUPC)
Embedded Distant-end Monitor and Control (EDMAC/EDMAC2)
1:1 and 1:N Redundancy options
CDM-570A: FSK communications to CSAT-5060 or KST-2000A
CDM-570AL: 10 MHz reference for BUC, FSK communications and optional BUC power supply
CDM-570AL: 10 MHz reference and power supply for LNB
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 bandwidth. 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
efficiencies, DoubleTalk Carrier-in-Carrier utilizing advanced signal processing techniques provides a new dimension in bandwidth
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
When observed on a spectrum analyzer, only the Composite is visible. Carrier 1 and Carrier 2 are shown in Figure 2 for reference only.
As DoubleTalk Carrier-in-Carrier allows equivalent spectral efficiency using a lower order modulation and/or code rate, it can reduce the
power required to close the link thereby reducing CAPEX by allowing a smaller BUC/amplifier and/or antenna. Alternatively, DoubleTalk
Carrier-in-Carrier can be used to achieve very high spectral efficiencies E.g., DoubleTalk Carrier-in-Carrier when used with 16-QAM
approaches the bandwidth efficiency of 256-QAM.
When combined with VersaFEC or TPC and optimized transmit filter rolloffs, DoubleTalk Carrier-in-Carrier provides unprecedented
savings in transponder bandwidth and power utilization. This allows for its successful deployment in bandwidth-limited and powerlimited scenarios, as well as reduction in earth station BUC/amplifier power requirements.
Carrier-in-Carrier® is a Registered Trademark of Comtech EF Data
DoubleTalk® is a Registered Trademark of Raytheon Applied Signal Technology
VersaFEC is a Registered Trademark of Comtech EF Data
Carrier-in-Carrier Automatic Power Control (CnC-APC)
The patent-pending Carrier-in-Carrier Automatic Power Control (CnC-APC) mechanism enables modems on both sides of a CnC link to
automatically measure and compensate for rain fade while maintaining the Total Composite Power. In addition to automatically
compensating for rain fade, CnC-APC also enables the modems to share link margin, i.e. a modem can effectively transfer excess link
margin to a distant end modem experiencing fade, thereby further enhancing overall availability.
VersaFEC Forward Error Correction
VersaFEC is a patent-pending system of high-performance LDPC codes designed to provide maximum coding gain while minimizing
latency. CDM-570A/L support Constant Coding & Modulation (CCM) mode of operation.
The Ultra Low Latency (ULL) codes provide even lower latency compared to standard VersaFEC codes.
Optimized Transmit Filter Rolloffs
CDM-570A/L support 5%, 10%, 15%, 20%, 25% and 35% transmit filter rolloff allowing users to further optimize the link. Carrier-inCarrier combined with VersaFEC and optimized transmit filter rolloffs can provide 50% or more BW savings compared to legacy
EDMAC & AUPC Operation
The CDM-570A/L-IP has the ability to monitor and control the distant end of a point-to-point satellite link using EDMAC or EDMAC2.
User data is framed and bits are added to pass control, status, and AUPC information. This is transparent to the user.
The modems support SNMP, web-based and command line interfaces for management. The modems can also be configured and
monitored from the front panel, or through the remote M&C port. Ten complete RF configurations may be stored in the modem. An
event log stores alarm and status information in non-volatile RAM, while the link statistics log stores link performance (Eb/No and AUPC
performance) for monitoring and reporting purposes.
FAST Feature Enhancements
The FAST codes make it easy to upgrade the modem capability in the field. New features can be added on site, using FAST access
codes purchased from Comtech EF Data that can be entered via the front panel.
Data Rate Range
(See user manual for
Symbol Rate
Frequency Range
Data Interfaces
2.4 kbps to 10.239 (depending on modulation, FEC
and framing), 1 bps step with fully independent TX and
RX rates
4.8 ksps to 3.0 Msps
CDM-570A: 50 to 90 or 100 to 180 MHz, 100 Hz
CDM-570AL: 950 to 2250 MHz, 100 Hz resolution
EIA-422/-530 DCE, V.35 DCE, Sync EIA-232, G.703
T1 balanced, G.703 E1 balanced or unbalanced
Modulation & FEC Options
Data Rate Range
BPSK 0.488
2.4 kbps to 1.462 Mbps
QPSK 0.533
5.2 kbps to 3.200 Mbps
QPSK 0.631
6.1 kbps to 3.785 Mbps
QPSK 0.706
6.8 kbps to 4.233 Mbps
QPSK 0.803
7.8 kbps to 4.818 Mbps
8-QAM 0.576 (ECCM)
8.3 kbps to 5.179 Mbps
8-QAM 0.642
9.3 kbps to 5.782 Mbps
8-QAM 0.711
10.3 kbps to 6.401 Mbps
8-QAM 0.780
11.3 kbps to 7.021 Mbps
16-QAM 0.644 (ECCM)
12.4 kbps to 7.726 Mbps
16-QAM 0.731
14.1 kbps to 8.776 Mbps
16-QAM 0.780
15 .0 kbps 9.361 Mbps
16-QAM 0.829
16.0 kbps to 9.946 Mbps
16-QAM 0.853
16.4 kbps to 10.239 Mbps
VersaFEC Ultra Low Latency (ULL) Codes
BPSK 0.493 (ULL)
2.4 kbps to 1.479 Mbps
QPSK 0.493 (ULL)
4.8 kbps to 2.959 Mbps
QPSK 0.654 (ULL)
6.3 kbps to 3.923 Mbps
QPSK 0.734 (ULL)
7.0 kbps to 4.405 Mbps
BPSK 5/16
2.4 kbps to 0.937 Mbps
BPSK 21/44
2.4 kbps to 1.430 Mbps
4.8 kbps to 2.860 Mbps
7.2 kbps to 4.500 Mbps
8.4 kbps to 5.250 Mbps
9.1 kbps to 5.666 Mbps
8PSK/8-QAM 3/4
10.8 kbps to 6.750 Mbps
8PSK/8-QAM 7/8
13.6 kbps to 7.875 Mbps
8PSK/8-QAM 0.95
15.3 kbps to 8.500 Mbps
16-QAM 3/4
14.4 kbps to 9.000 Mbps
16-QAM 7/8
16.8 kbps to 9.980 Mbps
BPSK 1/2
2.4 kbps to 1.500 Mbps
4.8 kbps to 3.000 Mbps
7.2 kbps to 4.500 Mbps
8.4 kbps to 5.250 Mbps
Viterbi + Reed Solomon
BPSK 1/2
2.4 kbps to 1.363 Mbps
4.3 kbps to 2.727 Mbps
6.5 kbps to 4.090 Mbps
7.5 kbps to 4.666 Mbps
16-QAM 3/4
13.0 kbps to 4.000 Mbps
16-QAM 7/8
16.8 kbps to 4.666 Mbps
TCM + Reed Solomon
2/3 8PSK TCM
8.7 kbps to 4.400 Mbps
(Closed network)
Uncoded BPSK
4.8 kbps to 3.000 Mbps
9.6 kbps to 5.000 Mbps
M&C Interface
Input/Output Impedance
External Reference Input
Form C Relays
Mode dependent – ITU V.35, or proprietary
externally synchronized
Ethernet 10/100Base-T, EIA-232, EIA-485
CDM-570A: matched for 50/75 Ω, 17 dB minimum
return loss, BNC connector
CDM-570AL: transmit and receive 50 Ω, > 17 dB
(950 MHz to 2250 MHz) and >19 dB (1000 MHz to
1900 MHz) minimum return loss, female Type N
1, 2, 5, or 10 MHz, BNC connector
TX, RX traffic alarms and unit faults
Frequency Stability
(With Internal Reference)
Output Power
Phase Noise
Output Spectrum/
Alpha (Rolloff)
Harmonics and Spurious
Transmit On/Off Ratio
External TX Carrier Off
TX Clock Options
Input Power Range
Max Composite Level
Acquisition Range
Acquisition Time
Doppler Buffer
Receive Clock Options
Clock Tracking
Monitor Functions
±1 ppm, 0º to 50ºC
±0.06 ppm, 0º to 50ºC
(32º to 122ºF)
(32º to 122ºF)
0 to –25 dBm, 0.1 dB
0 to –40 dBm, 0.1 dB
± 0.5 dB over frequency
± 1.0 dB over frequency
and temperature
and temperature
< 0.75 degrees RMS
< 1.2 degrees RMS
100 Hz to 1 MHz
100 Hz to 1 MHz
Meets IESS-308/-309 power spectral mask
5%, 10%, 15%, 20%, 25% and 35%
-60 dBC/4 kHz from 600 to 2600 MHz (L-Band), from 1
to 400 MHz (IF)
55 dB minimum
By TTL LOW signal, or RTS
Internal (SCT), external (TT), loop timing with
symmetric or asymmetric operation (data interface
-30 to -60 dBm
-130 + 10 log symbol rate,
dBm (minimum)
-90 + 10 log symbol rate,
dBm (maximum)
+35 dBc, up to
+40 dBc, up to
-5 dBm absolute max.
-10 dBm absolute max.
± 1 to ± 32 kHz,
± 1 to ± 32 kHz,
1 kHz step
1 kHz step, symbol rate <=
625 ksps
± 1 to ± 200 kHz,
1 kHz step, symbol rate >
625 ksps
Highly dependent on data rate, FEC rate, and
demodulator acquisition range. Example:
120 ms average at 64 kbps, Rate 1/2 QPSK, ± 10 kHz
acquisition sweep range, 6dB Eb/No
±128, 256, 512, 1024, 2048, 4096, 8192, 16384 or
32768 bits
Buffer disabled (RX satellite), buffer enabled
(symmetric or asymmetric operation) (data interface
± 100 ppm minimum
Eb/No, frequency offset, BER, buffer fill status, RX
signal level
DoubleTalk Carrier-in-Carrier
Delay Range
Power Spectral Density Ratio
(Interferer to Desired)
Maximum Symbol Rate Ratio
Eb/No Degradation
Satellite Restrictions
0 to 330 ms
-7 dB to +7 dB
3:1 (TX:RX or RX:TX)
0 dB Power Spectral Density Ratio
8-QAM: 0.4 dB
8PSK: 0.5 dB
16-QAM: 0.6 dB
+10 dB power spectral density ratio
Additional 0.3 dB
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)
Low-Noise Block Converter (LNB) Support (CDM-570AL)
LNB Voltage
LNB Reference
13 and18 VDC
10 MHz via RX center conductor,
Block Up Converter (BUC) Support (CDM-570AL)
BUC Voltage
BUC Reference
24 VDC, 90 W @ 50°C, 100 W @ 30°C
(internally fitted option)
48 VDC, 150 W @ 50°C, 180 W @ 30°C
(internally fitted option, not available with -24 VDC input)
10 MHz via TX center conductor,
FSK Support
Via TX center conductor with FSK BUCs
Environmental & Physical
Power Supply
Power Consumption
(See Manual)
(height x width x depth)
Operating: 0 to 50°C (32 to 122°F)
Storage: -25 to 85°C (-13 to 185°F)
100 to 240 VAC, 50/60 Hz
-24 VDC (HW option)
-48 VDC (HW option)
CDM-570A: 29 W typical (32 W max.)
CDM-570AL: 29 W typical (32 W max.) w/o BUC
CDM-570A: 1.75” x 19” x 13”
(4.4 x 48.3 x 330 cm)
CDM-570AL: 1.75” x 19” x 16”
(4.4 x 48.3 x 40.6 cm)
CDM-570A: 5 lbs (2.3 kg)
CDM-570AL: 7 lbs (3.2 kg) (without BUC P/S)
CDM-570AL: 16 lbs (7.2 kg) including 150 W BUC
power supply
Operations & Maintenance
Configuration and
Front panel
Remote port – EIA-232 or EIA-485 (2- or 4-wire)
SNMP with MIB II and private, modem-specific MIB
Web browser (HTTP)
Software/firmware upgrade via FTP
Faults and alarms
Configuration backup and restoral
Available Options
How Enabled
Password protection for web, ftp and telnet
Access list
CDM-570AL: 1:1 Modem Redundancy IF Switch
CDM-570A: 1:1 Modem Redundancy IF Switch
CDM-570A: 1:10 Modem Redundancy IF Switch Module
CDM-570AL: 1:10 Modem Redundancy IF Switch Module
CDM-570A & CDM-570AL: 1:10 Modem Redundancy Switch
CE Mark
Power supply, AC input
Power supply, -24 VDC input
Power supply, -48 VDC input
24 VDC, 90 W @ 50°C (100 W @ 30°C) BUC power supply, AC
input, -24 or -48 VDC input
48 VDC, 150 W @ 50°C (180 W @ 30°C) BUC power supply, AC
input or -48 VDC input
DoubleTalk Carrier-in-Carrier board
Turbo Codec board
(Required for Rate 0.95. Rate 5/16, 21/44, 3/4 and 7/8 can be
supported with or without the TPC board)
Modem data rate to 1.1 Mbps for CCM operation
Modem data rate to 2.5 Mbps for CCM operation
Modem data rate to 5 Mbps for CCM operation
Modem data rate to 10.239 Mbps for CCM operation
(Maximum data rate limited to 9.98 Mbps in CDM-570
Compatibility/Legacy mode. Maximum data rate limited to 9.98
Mbps when using TPC codec, 5.25 Mbps when using Viterbi,
4.666 Mbps when using Viterbi+RS, 4.4 Mbps when using
8PSK, 8-QAM modulation
(8PSK requires TPC codec or Reed-Solomon, 8QAM Requires
VersaFEC codec or TPC codec)
16-QAM modulation
(16-QAM requires VersaFEC codec or TPC codec or Reed
Optimized Transmit Filter Rolloffs (5%, 10%, 15%, 20% and 25%)
– 512 kbps, 1.1 Mbps, 2.5 Mbps, 5 Mbps or 10.239 Mbps
VersaFEC Codec Data rate (CCM) – 512 kbps, 1.1 Mbps, 2.5
Mbps, 5 Mbps or 10.239 Mbps
TPC Codec (CCM) for Rate 5/16, 21/44, 3/4 and 7/8
(Rate 5/16, 21/44, 3/4 and 7/8 can be supported with or without
the TPC board) Not required if TPC board is present.
DoubleTalk Carrier-in-Carrier Data Rate (full) – 512 kbps, 1.1
Mbps, 2.5 Mbps, 5 Mbps, 10.239 Mbps
(Requires DoubleTalk Carrier-in-Carrier board
DoubleTalk Carrier-in-Carrier Data Rate (fractional) – 2.5 Mbps, 5
Mbps, 10.239 Mbps
(Requires DoubleTalk Carrier-in-Carrier board
DoubleTalk Carrier-in-Carrier Automatic Power Control (CnCAPC)
(Requires DoubleTalk Carrier-in-Carrier)
Reed Solomon Codec
G.703 clock extension
EN 301 489-1 (ERM)
EN55022 (Emissions)
EN55024 (Immunity)
EN 61000‐3‐2
EN 61000‐3‐3
EN60950 (Safety)
FCC Part 15, Subpart B
See all of Comtech EF Data’s Patents and Patents Pending at
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