COMTECH CDM-760 Advanced High-Speed Trunking and Broadcast Modem

The CDM-760 Advanced High-Speed Trunking and Broadcast Modem builds on our award-winning family of high-speed, ultra-efficient trunking modems. The CDM-760 further enhances our offerings to include ultra-wide band symbol rates, near theoretical performance with minimal implementation loss, and a variety of high-efficiency MODCOD selections. Configurable as a true DVB-S2&S2X broadcast modulator, demodulator, or Modem and supports HTS, GEO, and MEO mode operation with hitless antenna handover
and satellite handover.

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    The CDM-760 Advanced High-Speed Trunking and Broadcast Modem was designed to be the most efficient, highest throughput, point-to-point modem available. Accommodating the most demanding Internet Service Providers, Broadcasters, and telco backhaul links by offering users the most advanced combination of space segment saving capabilities while minimizing overhead.

    The CDM-760 offers an expansive range of symbol rates (100 ksps to 150 Msps) and data rates (100 kbps to >720 Mbps) simplex. In a duplex setting, this is >1.4 Gbps or 300 Msps. The onboard Ethernet interfaces support Super Jumbo Frames from 64 Bytes to >10,000 Bytes and will process Ethernet frames at a blazing > 1.2 Million packets/second. With the optional Packet Processor card installed the CDM-760 can support > 350,000 packets per second while performing simultaneous Header Compression and QoS.

    Comtech offers a variety of open or closed network specifications and MODCOD selections. The CDM-760 can be configured to run as DVB-S2 (EN 302 307), DVB-S2X (EN 302 307-2) open standard waveforms, or with Comtech’s DVB-S2-EB1& EB2 (Efficiency Boost) waveforms. All waveforms are interoperable with ACM and the CDM-760 DPD (Dynamic Pre-Distortion). DPD allows satellite amplifiers to push further into saturation, maximizing transponder efficiency. The pre-distortion function is constantly optimized by the modem and does not require any user intervention.

    Implementing Adaptive Coding and Modulation (ACM) operation allows link margin to be converted to user capacity during non-faded conditions by taking advantage of the actual signal-to-noise ratio rather than calculated worst-case signal-to-noise.

    By using the best encapsulation methods, the CDM-760 further increases throughput by using the minimal overhead. In G.703 synchronous mode, users can implement monitor and control over the satellite with no additional overhead. When using Ethernet bridge mode, less than 1% overhead is used for encapsulation.

    An optional high-speed packet processor card has a powerful user-defined QoS engine for traffic shaping, performing header compression (greatly reducing WAN capacity with smaller packets >60%), and enabling static routing. The optional K4 GZIP lossless compression engine performs real-time compression of user payload. Performance testing shows a 52% to 59% compression rate when tested against an industry-standard Calgary Corpus profile.

    DVB-CID ETSI TS 103 129 is the ETSI standard for combating satellite interference and is largely based on Comtech EF Data’s award-winning MetaCarrier® technology. MetaCarrier technology embeds and detects a small message and unique ID within a video or data satellite carrier. This embedded message and ID significantly reduce the time to identify and clear interference sources.

    Additionally, the CDM-760 leverages our powerful DoubleTalk® Carrier-in-Carrier® “Adaptive Cancellation” technology. With the ability to overlay TX and RX carriers, Carrier-in-Carrier enables the operator to establish the perfect balance between bandwidth and power, enabling the best possible use of the satellite resource and reducing operating expenses (OPEX). These technologies alone offer enormous savings to the ISP, Broadcaster, and telco operator. When used in combination, however, the capacity savings cannot be matched. The innovative high-performance architecture of the CDM-760 allows efficient networking and transport over satellite links while supporting a wide range of applications and network topologies.

    Key Features

    • Symbol Rate: 0.1 to 150 Msps
    • Data Rate: 0.1 to >720 Mbps (Simplex), >1.4 Gbps (Duplex)
    • DVB-S2 ETSI EN 302 307 & DVB-S2X EN 302 307-2 compliant
    • DVB-S2-EB1&EB2 Efficiency Boost technology
    • DoubleTalk Carrier-in-Carrier bandwidth compression
    • ACM and CCM
    • Embedded MetaCarrier DVB-CID ETSI TS 103 129
    • GSE – low overhead <1% encapsulation
    • K4 GZIP lossless compression
    • Automatic Uplink Power Control (AUPC)
    • Dynamic Pre-Distortion (DPD)
    • Super Jumbo Frame 64 - 10,240 Byte Support (In Non-Packet Processor Mode)
    • Packet Processor with > 190,000 PPS simplex and > 350,000 PPS duplex
    • 9,000 Byte Jumbo Frame (In Packet Processor Mode)
    • Layer 3 Routed Mode operation with up to 256 static routes (>105,000 PPS simplex, >150,000 PPS duplex)
    • Modulation: QPSK, 8PSK, 16APSK, 32APSK, 64APSK, 128APSK, 256APSK
    • Dual IF: 70/140 MHz, L-Band and L-Band monitor (standard)
    • LNB power and 10MHz reference, BUC 10MHz reference
    • Data Interfaces
    ▪ 2 Gigabit 10/100/1000Base-T interfaces (standard)
    ▪ 1 Optical Gigabit interface (optional)
    ▪ Processes > 600,000 pps simplex, 1.2M pps duplex
    ▪ PIIC optional interface cards
    ▪ ASI (DVB Asynchronous Serial Interface)
    ▪ G.703 E3/T3/STS-1 (34.368, 44.736, 51.84 Mbps)
    ▪ STM-1 Copper SDH (155.52 Mbps)
    ▪ OC-3 SONET single mode or multi-mode 1300 nm (155.52 Mbps)
    • Multistream capable (Multi-Interface mux)
    • Supports FSS, HTS, GEO, MEO, and LEO mode operation
    • Management: HTTP, SNMP, Telnet, RS-232/485 with In-band (over satellite) M&C control
    • 1:1 and 1:N redundancy switching available

    Typical Users

    • Mobile Operators / Telecom
    • Broadcasters
    • ISPs
    • Government & Military

    Common Applications

    • IP & Telco Trunking
    • DVB-S2 & S2X Video Delivery
    • HTS, GEO, and MEO Trunking
    • Disaster Recovery & Emergency Communications

    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 spectrum. 

    When observed on a spectrum analyzer, only the Composite is visible. Carrier 1 and Carrier 2 are shown in Figure 2 for reference only. Carrier-in-Carrier® is a Registered Trademark of Comtech EF Data DoubleTalk® is a Registered Trademark of Raytheon Applied Signal Technology

    Packet Processor

    The optional High-Speed Packet Processor enables efficient IP networking and transport over satellite with a processing engine capable of handling >190,000 PPS simplex and >350,000 PPS duplex. The packet processor performs header compression and Quality of Service (QoS) ensuring 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 functions in Managed Switch Mode of operating as a layer 2 switch with VLAN and MPLS support.

    Header Compression

    The Packet Processor incorporates industry-leading header compression for Ethernet and IP traffic. In managed switch mode, header compression can reduce the 54 byte Ethernet/IP/UDP/RTP header to as little as 1 byte. For applications such as VoIP, header compression can provide bandwidth savings exceeding 65%. E.g. the 8 kbps G.729 voice codec requires 31.2 kbps once encapsulated into an Ethernet frame with IP/UDP/RTP. With header compression, the same voice call needs about 9 kbps – a saving of almost 70%. And, bandwidth requirements for typical Web/HTTP traffic can be reduced by 10% or more with TCP/IP header compression.

    Supported Layer 2, 2+ Headers
    Supported Layer 3 Headers
    Ethernet + VLANTCP
    Ethernet + VLAN + VLANUDP
    Ethernet + MPLSRTP (Codec Independent)
    Ethernet + MPLS + MPLS
    Ethernet + VLAN + MPLS
    Ethernet + VLAN + MPLS + MPLS
    Ethernet + VLAN + VLAN + MPLS
    Ethernet + VLAN + VLAN + MPLS + MPLS

    Traffic Shaping Functionality (QoS)

    Traffic Shaping Functionality (QoS) – The high-speed packet processor functions in a layer 2 mode of operation while performing the three processes that comprise traffic shaping: Classification, Prioritization, and Drain.

    Classification of traffic is the basic mechanism by which a packet or frame can be sorted and associated with a particular group or priority. The more flexible a classification engine is, the more likely the high-value services can be protected.

    Prioritization of traffic is a method of assigning various value levels to a particular packet or frame. Prioritization ensures that the packets/frames are “ordered” in such a manner that the highest level of protection is provided to the most valuable traffic.

    Drain – Once the packets or frames are classified and prioritized, it needs to be determined how to drain the traffic. Does your network require you to pass all high-level traffic in a strict priority manner such that lower priority traffic could be “starved” in times of congestion? Or, can determinations be made about the maximum and minimum levels of service you can accept on a per classification basis? The CDM-760 packet processor gives the operator or service provider many options to choose from.

    DiffServ – Industry-standard method of providing QoS enabling seamless co-existence in networks that implement DiffServ
    Max/Priority – Provides traffic prioritization with the ability to limit maximum traffic per priority class
    Min/Max – Provides a Committed Information Rate (CIR) to each  class of traffic with the ability to allow a higher burstable rate depending on availability

    Max/Priority with Weighting Mode
    o Weights have applied all queues that have not reached their max BW limit
    o Once the max BW is reached, the scheduler will not drain any more data irrespective of its weights

    Min/MAX with Weighting Mode
    o First serves the minimum BW
    o Once the minimum BW is met, the weights are applied until the Max BW is met
    o Once the max BW is met, the scheduler will not drain any more data

    Up to 8 different levels of
    Weighting can be enabled
    per level
    Max / Priority

    Min / Max

    Max / Priority with Weighting
    Source IP Address

    Min / Max with Weighting
    Destination IP Address

    Source Port
    Destination Port

    Layer 3 Routed Mode

    In some cases, it may be desirable to function in a layer 3 routed mode of operation. The packet processor can be configured to run as a layer 3 device with static routing. The packet processor can have up to 256 static routes based on the destination IP address mask. The packet processor in layer 3 routed mode can support >105,000 PPS simplex or >150,000 PPS duplex.


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