The CDM-750 Advanced High-Speed Trunking Modem was designed to be the most efficient, highest throughput, point-to-point trunking modem available. The CDM-750 accommodates the most demanding Internet Service Provider (ISP) and telco backhaul links by offering users the most advanced combination of space segment saving capabilities while minimizing the need for unnecessary overhead. With the ability to process packets at line speed, the CDM-750 will not throttle throughput due to processing limitations. Beginning with the most efficient coding and modulation available, the CDM-750 leverages the DVB-S2 EN 302 307 LDPC/BCH standard to provide the best possible combination of coding and forward error correction ensuring that the maximum amount of satellite traffic is transported for a given signal to noise capacity.

Implementing Adaptive Coding and Modulation (ACM) operation (in packet-based applications) 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. This technology transforms link margin, implementation margin and margin for antenna pointing directly to improved throughput.

By using the best encapsulation methods, the CDM-750 further increases throughput by using 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.

The optional K4 GZIP lossless compression engine performs real-time compression of Ethernet traffic and is capable of running at the full rate of the modem. Offering 52% to 59% compression rates at random packet sizes using the Calgary Corpos bitstream, K4 GZIP can greatly increase the throughput of the satellite link, or reduce required bandwidth.

Additionally, the CDM-750 leverages Comtech EF Data’s 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 and telco operator. When used in combination, however, the savings are astronomical. The innovative high-performance architecture of the CDM-750 allows efficient networking and transport over satellite links while supporting a wide range of applications and network topologies.

Key Features

• Symbol Rate: 1 – 63 Msps

• Data Rate: 1 – 169 Mbps

• DVB-S2 ETSI EN 302 307 compliant

• DoubleTalk Carrier-in-Carrier bandwidth compression

• ACM and CCM

• GSE – industry standard encapsulation

• K4 GZIP lossless compression

• Modulation: QPSK, 8PSK, 16APSK, 32APSK

• Coding: DVB-S2 LDPC/BCH

• Dual IF: 70/140 MHz, L-Band and L-Band monitor (standard)

• Data Interfaces

  • 2 Gigabit 10/100/1000Base-T interfaces (standard)

  • 1 Optical Gigabit interface (optional)

  • Process > 300,000 pps simplex, > 600,000 pps duplex

  • PIIC optional interface cards

  • 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)

• Management: HTTP, SNMP, Telnet, RS-232/485

• In-band (over satellite) M&C control

• 1:1 redundancy switching available

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