Comtech EF Data CDM-760 - Manual (Page 28)

Introduction Revision 2
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
1–2
Additionally:
• The CDM-760 implements Adaptive Coding and Modulation (ACM) operation. This 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.
• The CDM-760 uses Generic Stream Encapsulation (GSE), thereby increasing throughput by
using minimal overhead. In G.703 synchronous mode, you 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 CDM-760 offers Automatic Uplink Power Control (AUPC) to further improve link
availability. AUPC is an algorithm that changes the TX power of either side of the link in
order to compensate for fade conditions. AUPC communications between the modems is
transparent to the user and uses less than 0.1% overhead in the satellite data link.
• Radio Frequency Interference (RFI) is the largest single issue that impacts Quality of Service
for satellite operators. Comtech EF Data’s MetaCarrier® Carrier Identification (CID)
technology is used to embed and detect carrier identification on video and data satellite
carriers. This technology, which is a standard feature on the CDM-760, was adopted by the
DVB organization and is now a DVB (DVB-CID) and ETSI (TS 103 129) standard to assist in the
control of satellite interference.
• The CDM-760’s 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. It
offers 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.
• The CDM-760 leverages Comtech EF Data’s DoubleTalk® Carrier-in-Carrier® “Adaptive
Cancellation” technology. With the ability to overlay Tx and Rx carriers, Carrier-in-Carrier
(CnC) allows you to establish an optimal balance between bandwidth and power, enabling
the best possible use of the satellite resource and reducing operating expenses (OPEX).
• 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 CDM-760 is software upgradeable to support other standards such as DVB-S2X (EN 302
207 Part 2), and future waveforms.