Comtech EF Data CDM-840 - Manual (Page 176)

CDM-840 Remote Router Revision 2
Appendix A MN-CDM840
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-840 and ODM/R-840 Remote Routers: The FEC method used by the remote site
CDM-840, ODM-840, and ODMR-840 Remote Routers depends on the direction of signal
processing in use:
• The receive (Rx) side of the 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 840 uses the VersaFEC® family of short-block LDPC codes.
• Appendix B. FEC (FORWARD ERROR CORRECTION) OPTIONS in this manual
• Appendix B. 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)
For the CDM-800 Gateway Router via the CTOG-250 Comtech Traffic Optimization Gateway:
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 the CTOG-250
Comtech Traffic Optimization Gateway Installation and Operation Manual
(CEFD P/N MN-CTOG250)
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 B. FEC (FORWARD ERROR CORRECTION) OPTIONS in the Comtech EF Data
CDD-880 Multi Receiver Router Installation and Operation Manual (CEFD P/N
MN-CDD880)