COMTECH CDM-570A/L & CDM-570A/L-IP 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-2 high-performance LDPC and VersaFEC® low latency LDPC Forward Error Correction (FEC), the revolutionary DoubleTalk® Carrier-in-Carrier® bandwidth compression and optimized transmit filter roll-offs, 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 includes a high-performance packet processor for IP-centric applications.

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    Key Features

    • DoubleTalk Carrier-in-Carrier bandwidth compression
    • Carrier-in-Carrier Automatic Power Control (CnC-APC)
    • VersaFEC-2 High-Performance LDPC
    • VersaFEC low latency LDPC
    • VersaFEC-2 and 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/8-ARY, 16-QAM/16-ARY, 32-ARY
    • Forward Error Correction (FEC) options include VersaFEC-2, 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 (CDM-570A-IP and CDM-570AL-IP)
    • 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)
    • CarrierID using Comtech EF Data’s MetaCarrier® spread spectrum technology
    • Redundancy options
    • CDM-570A: FSK communications to CSAT-5060 or KST-2000A
    • CDM-570AL: 10 MHz references for BUC, FSK communications, and optional BUC power supply
    • CDM-570AL: 10 MHz references and power supply for LNB

    Typical Users

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

    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

    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

    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 32-ARY
    modulation can provide bandwidth efficiency exceeding 8 bps/Hz.

    When combined with VersaFEC-2 or VersaFEC 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 power-limited scenarios, as well as a 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-2 High Performance LDPC Forward Error Correction

    CDM-570A now offers a new high performance LDPC FEC specifically designed to optimize performance at low to mid-tier symbol rates. VersaFEC-2 long block provides 38 ModCods (BPSK to 32-ARY) with performance generally better than DVB-S2 at significantly lower latency and short-block provides 36 ModCods (BPSK to 32-ARY) with higher coding gain than first generation VersaFEC and similar latency. All higher order constellations are quasi-circular for optimal peak-to-average performance. ACM operation is supported for long block and short block for IP/Ethernet traffic in a point-to-point topology.

    VersaFEC Forward Error Correction

    VersaFEC is a patent-pending system of LDPC codes designed to provide maximum coding gain while minimizing latency. CDM-570A/L support Constant Coding & Modulation (CCM) mode of operation with serial and G.703 data interfaces. CDM-570A/L-IP also supports Adaptive Coding & Modulation (ACM) for IP/Ethernet traffic when operating in a point-to-point topology. 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-in-Carrier combined with VersaFEC and optimized transmit filter rolloffs can provide 50% or more BW savings compared to legacy modems.

    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 transfer control, status, and AUPC information.


    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.

    G.703 Clock Extension

    Mobile networks require precise synchronization of base stations, which is a challenge when using IP backhaul. Most operators are forced to use GPS-based external equipment for site synchronization. CDM-570A/L-IP offers a G.703 clock extension option that propagates a high stability reference from the hub to the remote. This process does not require additional bandwidth.


    CDM-570A now incorporates a patent-pending carrier identification (CID) technique that uses Comtech EF Data’s MetaCarrier® spread spectrum technology to embed a unique carrier identification sequence for the transmitted carrier to help identify interfering carriers. CDM-570A with MetaCarrier® is used in tandem with Comtech EF Data’s MCDD-100 MetaCarrier® Detection Device to provide a complete MetaCarrier embedding and decoding solution.

    High Performance Packet Processor (CDM-570A/L-IP)

    The high-performance Packet Processor enables efficient IP networking and transport over satellite with header compression, payload compression, and advanced Quality of Service. The advanced QoS combined with header and payload compression ensures the highest quality of service with minimal jitter and latency for real-time traffic, priority treatment of mission-critical applications, and maximum bandwidth efficiency.

    The packet processor supports Routed mode as well as Managed Switch Mode of operation. In managed switch mode, it operates as a layer 2 switch with VLAN support, enabling seamless integration with existing infrastructure while providing full optimization including header compression and payload compression and advanced QoS.

    The CDM-570A/L-IP supports a wide range of applications and network topologies.

    Header Compression Option

    The packet processor incorporates industry-leading header compression for IP/Ethernet traffic. In Routed mode, header compression can be enabled on a per route basis and can reduce the typical 40-byte IP/UDP/RTP header to an average of 2 bytes. For TCP/IP, the 40-byte header is reduced to an average of 4 bytes. In Managed switch mode, header compression also compresses the Ethernet header. So a 58-byte Ethernet header with VLAN and IP/UDP/RTP header can be compressed to as little as 2 bytes. For applications such as VoIP, header compression can provide bandwidth savings exceeding 60%. E.g. 8 kbps G.729 voice transported in an IP/UDP/RTP datagram typically requires 24 kbps in a routed network or approximately 32.4 kbps in a switched network including VLAN header and FCS. With header compression, the same voice call needs approx. 9 kbps (before HDLC encapsulation) – a savings of over 60% in a routed network or over 70% in a switched network. Bandwidth requirement for typical Web/HTTP traffic is also reduced with TCP/IP header compression.

    Payload Compression Option

    Implemented in the hardware for maximum throughput and efficiency, payload compression can typically reduce the required satellite bandwidth by 20-30%.

    Quality of Service (QoS) Option

    Today’s networks have to support a wide range of applications with diverse requirements. The packet processor incorporates an advanced QoS mechanism to ensure the highest service quality with minimal jitter and latency for real-time traffic, and priority treatment of mission-critical applications while maximizing bandwidth utilization. Four different QoS modes are available:

    • DiffServ – Industry-standard method of providing QoS enabling seamless co-existence in networks that implement DiffServ.
    • Max/Priority – Provides eight levels of traffic prioritization with the ability to limit maximum traffic per priority class
    • Min/Max – Provides a Committed Information Rate (CIR) to each user-defined class of traffic with the ability to allow a higher burstable rate depending on availability
    • VLAN Priority/Max – Available in Managed switch mode when using VLANs. Uses 3-bit 802.1p VLAN priority with the ability to set a maximum data rate per priority

    Packet processor includes a powerful classifier capable of classifying packets based on Application/Protocol, Source IP Address/Subnet, Destination IP Address/Subnet, Source Port / Range and Destination Port / Range.

    Vipersat Management System

    • Dynamic SCPC carrier allocation & true bandwidth-on-demand
    • User-defined policies for upstream carrier switching
    • Star and dynamic mesh capabilities using single hop on-demand
    • Guaranteed bandwidth capability

    VMS Network & Bandwidth Management

    A Vipersat-powered network integrates these advanced modems with a powerful network management tool, the Vipersat Management

    System (VMS). In addition to the traditional monitoring and control of the CDM-570A/L-IP modems and the demodulators, the VMS allows these devices to share bandwidth, and when needed, switch automatically to a dedicated SCPC channel. In a Vipersat-powered network, the CDM-570A/L-IP modem takes advantage of its fast acquisition demodulation to allow it to operate in a shared mode. Inbound transmissions (from remote to hub) can be switched from a shared Selective Time Division Multiple Access (STDMA) mode to a dedicated Single Carrier Per Channel (SCPC) connection via a variety of user-defined policies or triggers. This enables the network to more effectively handle real-time connection-oriented applications and reduces both latency and network congestion. Through VMS, dynamic point-to-point mesh connections can also be established between remotes.

    Upstream Switching

    Through protocol classification in the remote terminals, the modem initiates automatic switching. VMS establishes dSCPC bandwidth based on policies that can be individually enabled on a per-remote basis, or globally enabled. Policies can be configured for a variety of applications such as VoIP, video (VTC), or based on a load, or via a schedule, Type of Service (ToS), or QoS rules such as IP port or IP address and protocol type. Operators are able to set minimum and maximum data rates for each remote as well as excess data rates for an initial upstream switch.

    Vipersat Operation Mode

    Vipersat operation is enabled via a FAST feature code. Networks can easily start off in point-to-point or point-to-multipoint configurations. As the network grows and users wish to take advantage of the bandwidth on-demand savings by implementing a Vipersat network, modems can easily be upgraded to Vipersat mode.

    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.


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