CDM-570A/L & CDM-570A/L-IP Satellite Modems

Comtech EF Data

CDM-570A/L & CDM-570A/L-IP Satellite Modems

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  • DoubleTalk Carrier-in-Carrier bandwidth compression
  • Carrier-in-Carrier Automatic Power Control (CnC-APC)
  • VersaFEC low latency LDPC
  • VersaFEC Adaptive Coding & Modulation (ACM) for point-to-point IP circuits
  • 5%, 10%, 15%, 20%, 25% and 35% Transmit Filter Rolloff
  • Data rate range from 2.4 kbps to 10.239 Mbps

SKU: CMT104 Tags: , , , ,
  • Description
  • Technical Specifications
  • Support Documents

Overview

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 bandwidth savings. 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 EIA- 232 and G.703 T1/E1 data interfaces. The CDM-570A/L-IP include a high-performance packet processor for IP-centric applications.

Who are the typical users?

  • Enterprise
  • Offshore & Maritime
  • Mobile Network Operators
  • Satellite Service Providers
  • Internet Service Providers

What are the common applications?

  • Enterprise Networks
  • Offshore & Maritime Communications
  • Mobile Backhaul
  • Communications on-the-Move
  • Disaster Recovery & Emergency Communications
  • Satellite News Gathering

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 efficiency.

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 spectrum.

Comtech EF Data Modem CDM570a figure

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.

Details

  • DoubleTalk Carrier-in-Carrier bandwidth compression
  • Carrier-in-Carrier Automatic Power Control (CnC-APC)
  • VersaFEC low latency LDPC
  • VersaFEC Adaptive Coding & Modulation (ACM) for point-to-point IP circuits
  • 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: BPSK, QPSK, OQPSK, 8PSK, 8-QAM, 16-QAM
  • Forward Error Correction (FEC) options 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, 10/100Base-T Ethernet (option)
  • High-performance Packet Processor with 10/100Base-T Ethernet port (CDM-570A-IP and CDM-570AL-IP)
  • Vipersat Management System (VMS) integration (CDM-570A-IP and CDM-570AL-IP)
  • Header and payload compression ((CDM-570A-IP and CDM-570AL-IP)
  • Quality of Service (QoS) (CDM-570A-IP and CDM-570AL-IP)
  • Management via SNMP, Web, Telnet or Command Line Interface (CDM-570A-IP and CDM-570AL-IP)
  • G.703 clock extension
  • Automatic Uplink Power Control (AUPC)
  • Embedded Distant-end Monitor and Control (EDMAC/EDMAC2)
  • 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
Specifications
Data Rate Range
(See user manual for details)
2.4 kbps to 10.239 (depending on modulation, FEC and framing), 1 bps step with fully independent TX and RX rates
Symbol Rate 4.8 ksps to 3.0 Msps
Frequency Range CDM-570A: 50 to 90 or 100 to 180 MHz, 100 Hz resolution
CDM-570AL: 950 to 2250 MHz, 100 Hz resolution
Data Interfaces EIA-422/-530 DCE, V.35 DCE, Sync EIA-232, G.703 T1 balanced, G.703 E1 balanced or unbalanced, 10/100Base-T Ethernet (option)
Modulation & FEC Options / Data Rate Range
VersaFec
  BPSK 0.488
  QPSK 0.533
  QPSK 0.631
  QPSK 0.706
  QPSK 0.803
  8-QAM 0.576 (ECCM)
  8-QAM 0.642
  8-QAM 0.711
  8-QAM 0.780
  16-QAM 0.644 (ECCM)
  16-QAM 0.731
  16-QAM 0.780
  16-QAM 0.829
  16-QAM 0.853
  
2.4 kbps to 1.462 Mbps
5.2 kbps to 3.200 Mbps
6.1 kbps to 3.785 Mbps
6.8 kbps to 4.233 Mbps
7.8 kbps to 4.818 Mbps
8.3 kbps to 5.179 Mbps
9.3 kbps to 5.782 Mbps
10.3 kbps to 6.401 Mbps
11.3 kbps to 7.021 Mbps
12.4 kbps to 7.726 Mbps
14.1 kbps to 8.776 Mbps
15 .0 kbps 9.361 Mbps
16.0 kbps to 9.946 Mbps
16.4 kbps to 10.239 Mbps
VersaFEC Ultra Low Latency (ULL) Codes
  BPSK 0.493 (ULL)
  QPSK 0.493 (ULL)
  QPSK 0.654 (ULL)
  QPSK 0.734 (ULL)
  
2.4 kbps to 1.479 Mbps
4.8 kbps to 2.959 Mbps
6.3 kbps to 3.923 Mbps
7.0 kbps to 4.405 Mbps
TPC
  BPSK 5/16
  BPSK 21/44
  QPSK/OQPSK 21/44
  QPSK/OQPSK 3/4
  QPSK/OQPSK 7/8
  QPSK/OQPSK 0.95
  8PSK/8-QAM 3/4
  8PSK/8-QAM 7/8
  8PSK/8-QAM 0.95
  16-QAM 3/4
  16-QAM 7/8
  
2.4 kbps to 0.937 Mbps
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
10.8 kbps to 6.750 Mbps
13.6 kbps to 7.875 Mbps
15.3 kbps to 8.500 Mbps
14.4 kbps to 9.000 Mbps
16.8 kbps to 9.980 Mbps
Viterbi
  BPSK 1/2
  QPSK/OQPSK 1/2
  QPSK/OQPSK 3/4
  QPSK/OQPSK 7/8
  
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
  QPSK/OQPSK 1/2
  QPSK/OQPSK 3/4
  QPSK/OQPSK 7/8
  16-QAM 3/4
  16-QAM 7/8
  
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
13.0 kbps to 4.000 Mbps
16.8 kbps to 4.666 Mbps
TCM + Reed Solomon
  2/3 8PSK TCM (Closed network)
  
8.7 kbps to 4.400 Mbps
Uncoded
  Uncoded BPSK
  Uncoded QPSK/OQPSK
  
4.8 kbps to 3.000 Mbps
9.6 kbps to 5.000 Mbps
Note: Data rate specifications reflect CDM-570A/L or CDM-570A/L-IP modem operating in non-Vipersat mode
Scrambling Mode dependent – ITU V.35, or proprietary externally synchronized
Input/Output Impedance 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 connector
External Reference Input 1, 2, 5, or 10 MHz, BNC connector
Form C Relays TX, RX traffic alarms and unit faults
Modulator
Frequency Stability w/Internal Ref
  CDM-570A
  CDM-570AL
  
±1 ppm, 0º to 50ºC (32º to 122ºF)
±0.06 ppm, 0º to 50ºC (32º to 122ºF)
Output Power
  CDM-570A
  CDM-570AL
  
0 to –25 dBm, 0.1 dB steps
0 to –40 dBm, 0.1 dB steps
Accuracy
  CDM-570A
  CDM-570AL
  
± 0.5 dB over frequency and temperature
± 1.0 dB over frequency and temperature
Phase Noise
  CDM-570A
  CDM-570AL
  
< 0.75 degrees RMS double-sided, 100 Hz to 1 MHz
< 1.2 degrees RMS double-sided, 100 Hz to 1 MHz
Output Spectrum/Filtering Meets IESS-308/-309 power spectral mask
Alpha (Rolloff) 5%, 10%, 15%, 20%, 25% and 35%
Harmonics and Spurious -60 dBC/4 kHz from 600 to 2600 MHz (L-Band), from 1 to 400 MHz (IF)
Transmit On/Off Ratio 55 dB minimum
External TX Carrier Off By TTL LOW signal, or RTS
TX Clock Options Internal (SCT), external (TT), loop timing with symmetric or asymmetric operation (data interface dependent)
Demodulator
Input Power Range
  CDM-570A
  CDM-570AL
  
-30 to -60 dBm
-130 + 10 log symbol rate, dBm (minimum)
-90 + 10 log symbol rate, dBm (maximum)
Max Composite Level
  CDM-570A
  CDM-570AL
  
+35 dBc, up to -5 dBm absolute max.
+40 dBc, up to -5 dBm absolute max.
Acquisition Range
  CDM-570A
  CDM-570AL
  
± 1 to ± 32 kHz,
1 kHz step
± 1 to ± 32 kHz,
1 kHz step, symbol rate <=
625 ksps
± 1 to ± 200 kHz,
1 kHz step, symbol rate >
625 ksps
Acquisition Time Highly dependent on data rate, FEC rate, and demodulator acquisition range. Example: 120 ms average at 64 kbps, Viterbi Rate 1/2 QPSK, ± 10 kHz acquisition sweep range, 6 dB Eb/No
Plesiochronous/Doppler Buffer ±128, 256, 512, 1024, 2048, 4096, 8192, 16384 or 32768 bits
Receive Clock Options Buffer disabled (RX satellite), buffer enabled (symmetric or asymmetric operation) (data interface dependent)
Clock Tracking ± 100 ppm minimum
Monitor Functions Eb/No, frequency offset, BER, buffer fill status, RX signal level
DoubleTalk Carrier-in-Carrier
Delay Range 0 to 330 ms
Power Spectral Density Ratio
(Interferer to Desired)
-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: 0.3 dB
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 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)
Networking Protocols (With optional IP Module)
(View our Datasheet PDF)
Low-Noise Block Converter (LNB) Support (CDM-570AL)
LNB Voltage Selectable OFF, 13 VDC or 18 VDC
LNB Reference 10 MHz via RX center conductor, Selectable ON/OFF 0.0 dBm ± 5 dB
Block Up Converter (BUC) Support (CDM-570AL)
BUC Voltage 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)
BUC Reference 10 MHz via TX center conductor, Selectable ON/OFF
0.0 dBm ± 5 dB
FSK Support Via TX center conductor with FSK BUCs
Environmental & Physical
Temperature Operating: 0 to 50°C (32 to 122°F)
Storage: -25 to 85°C (-13 to 185°F)
Power Supply 100 to 240 VAC, 50/60 Hz
-24 VDC (HW option)
-48 VDC (HW option)
Power Consumption CDM-570A: 29 W typical (32 W max.) (w/o IP module)
CDM-570AL: 29 W typical (32 W max.) (w/o BUC, w/o IP module)
Dimensions
(height x width x depth)
CDM-570A: 1.75” x 19” x 13”
(4.4 x 48.3 x 33 cm)
CDM-570AL: 1.75” x 19” x 16”
(4.4 x 48.3 x 40.6 cm)
Weight CDM-570A: 6.3 lbs (2.86 kg) (w/o IP Module)
CDM-570A-IP: 6.6 lbs (2.99 kg)
CDM-570AL: 7.2 lbs (3.27 kg) (w/o BUC P/S, w/o IP Module)
CDM-570AL-IP: 8.5 lbs (3.86 kg) (with 24 VDC BUC P/S)
Operations & Maintenance
Configuration and Management Front panel
Remote port – EIA-232 or EIA-485 (2- or 4-wire)
10/100BaseT Ethernet SNMP with MIB II and private, modem-specific MIB Telnet
Web browser (HTTP)
Command Line Interface (CDM-570A/L-IP)
Software/firmware upgrade via FTP
Faults and alarms
Configuration backup and restoral
Security
Password protection for web, ftp and telnet Access list
Accessories
CRS-170A CDM-570AL and CDM-570AL-IP: 1:1 Modem Redundancy IF Switch
CRS-180 CDM-570A and CDM-570A-IP: 1:1 Modem Redundancy IF Switch
CRS-280 CDM-570A: 1:10 Modem Redundancy IF Switch Module
CRS-280L CDM-570AL: 1:10 Modem Redundancy IF Switch Module
CRS-300 CDM-570A & CDM-570AL: 1:10 Modem Redundancy Switch
Available Options - How Enabled / Option
Hardware Power supply, AC input
Hardware Power supply, -24 VDC input
Hardware Power supply, -48 VDC input
Hardware 24 VDC, 90 W @ 50°C (100 W @ 30°C) BUC power supply, AC input, -24 or -48 VDC input
Hardware 48 VDC, 150 W @ 50°C (180 W @ 30°C) BUC power supply, AC input or -48 VDC input
Hardware DoubleTalk Carrier-in-Carrier board
Hardware 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)
Hardware Packet Processor
FAST Modem data rate to 1.1 Mbps for CCM operation
FAST Modem data rate to 2.5 Mbps for CCM operation
FAST Modem data rate to 5 Mbps for CCM operation
FAST 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 TCM+RS)
FAST 8PSK, 8-QAM modulation
(8PSK requires TPC codec or Reed-Solomon, 8QAM Requires VersaFEC codec or TPC codec)
FAST 16-QAM modulation
(16-QAM requires VersaFEC codec or TPC codec or Reed Solomon)
FAST IP ACM Symbol Rate – 375 ksps, 750 ksps, 1.5 Msps, 2 Msps or 3 Msps (Requires Packet Processor)
FAST Optimized Transmit Filter Rolloffs (5%, 10%, 15%, 20% and 25%) – 512 kbps, 1.1 Mbps, 2.5 Mbps, 5 Mbps or 10.239 Mbps
FAST VersaFEC Codec Data rate (CCM) – 512 kbps, 1.1 Mbps, 2.5 Mbps, 5 Mbps or 10.239 Mbps
FAST 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.
FAST 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
FAST DoubleTalk Carrier-in-Carrier Data Rate (fractional) – 2.5 Mbps, 5 Mbps, 10.239 Mbps
(Requires DoubleTalk Carrier-in-Carrier board
FAST DoubleTalk Carrier-in-Carrier Automatic Power Control (CnCAPC)
(Requires DoubleTalk Carrier-in-Carrier)
FAST Reed Solomon Codec
FAST G.703 clock extension
FAST Packet Processor Options – Header compression, Payload compression, Quality of Service (QoS), VMS Integration
Regulatory
CE Mark EN 301 489-1 (ERM)
EN55022 (Emissions)
EN55024 (Immunity)
EN 61000‐3‐2
EN 61000‐3‐3
EN60950 (Safety)
FCC FCC Part 15, Subpart B

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