Comtech EF Data CTOG-250 - Manual (Page 192)

CTOG-250 Comtech Traffic Optimization Gateway Revision 1
Appendix A MN-CTOG250
A–2
A.1 FEC (FORWARD ERROR CORRECTION) OPTIONS
The method of FEC used among Comtech EF Data’s Advanced VSAT series of products differs
according to Advanced VSAT Series product.
For the CDM-800 Gateway Router: The FEC method used by the hub site CDM-800 is based
upon the DVB-S2 standard for QPSK, 8PSK, 16APSK and 32APSK with concatenated Low Density
Parity Code (LDPC) and Bose-Chaudhuri-Hocquenghem (BCH).
Appendix B. FEC (FORWARD ERROR CORRECTION) OPTIONS in this manual.
For the CDD-880 Multi Receiver Router: The FEC method used by the hub site CDD-880 Multi
Receiver Router is a family of short-block Low Density Parity Check (LDPC) codes with very low
latency called VersaFEC®. It is a patent pending technology wholly owned and developed by
Comtech EF Data and CEFD sister division Comtech AHA Corp. (the VersaFEC name is a
trademark registered to Comtech AHA).
Appendix A. FEC (FORWARD ERROR CORRECTION) OPTIONS in the Comtech EF Data
CDD-880 Multi Receiver Router Installation and Operation Manual (CEFD P/N
MN-CDD880).
For the CDM-840 and ODM/R-840 Remote Routers: The FEC method used by the remote site
CDM-840 Remote Router depends on the direction of signal processing in use:
• The receive (Rx) side of the CDM-840 operates with error correction based upon the
DVB-S2 standard for QPSK, 8PSK, 16APSK and 32APSK with concatenated Low Density
Parity Code (LDPC) and Bose-Chaudhuri-Hocquenghem (BCH).
• The transmit (Tx) side of the CDM-840 uses the VersaFEC® family of short-block LDPC
codes.
• Appendix A. FEC (FORWARD ERROR CORRECTION) OPTIONS in the Comtech EF
Data CDM-840 Remote Router Installation and Operation Manual (CEFD P/N
MN-CDM840)
• Appendix A. FEC (FORWARD ERROR CORRECTION) OPTIONS in the Comtech EF
Data ODM-840 Outdoor Remote Router / ODMR-840 Reduced Form Factor
Outdoor Remote Router Installation and Operation Manual (CEFD P/N
MN-ODM840)
A.2 Adaptive Coding and Modulation / Variable Coding and Modulation
(ACM/VCM)
The VersaFEC® Adaptive Coding and Modulation (ACM) feature is a patents-pending technology
owned and developed by Comtech EF Data and CEFD sister division Comtech AHA Corp. ACM
turns fade margin into increased link capacity by automatically adapting the modulation type