CDM-840 Remote Router MN-CDM840
Appendix A Revision 3
A–2
A.2 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. This includes VersaFEC®, a family of short‐block
Low Density Parity Check (LDPC) codes with very low latency. VersaFEC® is a patent pending
technology wholly owned and developed by Comtech EF Data and Comtech AHA Enterprise
Products Group (the VersaFEC name is a trademark registered to Comtech AHA).
F
or the CDM-840 and ODM-840 Remote Routers: The FEC method used by the remote site
CDM
‐8
40 and ODM‐840 Remote Routers depends on the direction of signal processing in use:
• T
he Rx (receive) side of the 840 operates with error correction based upon the DVB‐S2
standard for QPSK, 8‐PSK, 16‐APSK and 32‐APSK with concatenated LDPC and
Bose‐Chaudhuri‐Hocquenghem (BCH).
• T
he Tx (transmit) 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 Remote Router / ODMR-840 Reduced Form Factor Remote
Router / ODMR-840B Remote Router Board Set Installation and Operation
Manual (CEFD P/N MN-ODM840)
For the CDD-880 Multi Receiver Router: The hub site CDD‐880 Multi Receiver Router uses the
VersaFEC® family of short‐block LDPC codes.
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)
F
or the CDM-800 Gateway Router via the CTOG-250 Comtech Traffic Optimization Gateway:
The hub site CDM
‐8
00 uses the FEC method based upon the DVB
‐S
2 standard for QPSK, 8
‐P
SK,
16‐
A
PSK and 32
‐A
PSK with concatenated LDPC and BCH.
Appendix B. FEC (FORWARD ERROR CORRECTION) OPTIONS in the CTOG-250 Comtech
Traffic Optimization Gateway with CDM-800 Gateway Router Installation and
Operation Manual (CEFD P/N MN-CTOG250)
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