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美国 COMTECH CDM-760 卫星调制解调器
    发布时间: 2020-04-12 17:00    

美国 COMTECH CDM-760包括超宽带符号率、接近理论性能且实现损失最小、多种高效 MODCOD 选择。 可配置为真正的 DVB-S2&S2X 广播调制器、解调器或调制解调器,并支持 HTS、GEO 和 MEO 模式操作以及无中断天线切换和卫星切换。

美国 COMTECH CDM-760  卫星调制解调器

美国 Cometech CDM-760 Advanced High-Speed Trunking and Broadcast Modem 卫星调制解调器


概述

美国 Comtech CDM-760 高级高速中继和广播调制解调器以我们屡获殊荣的高速、超高效中继调制解调器系列为基础。 CDM-760 进一步增强了我们的产品,包括超宽带符号率、接近理论性能且实现损失最小、各种高效 MODCOD 选择。可配置为真正的 DVB-S2&S2X 广播调制器、解调器或调制解调器,并支持 HTS、GEO 和 MEO 模式操作以及无中断天线切换和卫星切换。


美国 Comtech  CDM-760 高级高速中继和广播调制解调器被设计为最高效、最高吞吐量的点对点调制解调器。通过为用户提供最先进的空间段节省功能组合,同时最大限度地减少开销,从而适应最苛刻的互联网服务提供商、广播公司和电信回程链路。


美国Comtech  CDM-760 提供广泛的符号速率(100 ksps 至 150 Msps)和数据速率(100 kbps 至 >720 Mbps)单工。在双工设置中,这是 >1.4 Gbps 或 300 Msps。板载以太网接口支持从 64 字节到 >10,000 的超巨型帧

字节并将以超过 120 万个数据包/秒的速度处理以太网帧。安装可选的数据包处理器卡后,Cometech CDM-760 可以支持每秒超过 350,000 个数据包,同时执行同步的报头压缩和 QoS。


美国 Comtech 提供各种开放或封闭的网络规范和MODCOD 选择。 Comtech CDM-760 可配置为 DVB-S2 (EN 302 307)、DVB-S2X (EN 302 307-2) 开放标准波形,或与 Comtech 的 DVB-S2-EB1 和 EB2(效率提升)一起运行

波形。所有波形均可与 ACM 和 CDM-760 DPD(动态预失真)互操作。 DPD 允许卫星放大器进一步进入饱和状态,最大限度地提高转发器效率。调制解调器不断优化预失真功能,不需要任何用户干预。


实施自适应编码和调制 (ACM) 操作允许在非衰落条件下通过利用实际信噪比而不是计算的最坏情况下的信噪比将链路余量转换为用户容量。


通过使用最好的封装方法,美国Comtech  CDM-760 通过使用最小的开销进一步提高了吞吐量。在 G.703 同步模式下,用户可以在没有额外开销的情况下实现对卫星的监视和控制。使用以太网桥接模式时,不到 1% 的开销用于封装。


可选的高速数据包处理器卡具有强大的用户定义的 QoS 引擎,用于流量整形、执行报头压缩(使用 >60% 的较小数据包大大降低 WAN 容量)并启用静态路由。可选的 K4 GZIP 无损压缩引擎对用户有效负载进行实时压缩。

美国 Comtech CDM-760 Advanced High-Speed Trunking and Broadcast Modem 卫星调制解调器


Overview

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, 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.


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 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 enables static routing. The optional K4 GZIP lossless compression engine performs real-time compression of user payload.


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