Table of Contents
Advertisement
CDD-880 Multi Channel Receiver
Appendix A
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).
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 this manual.
For the CDM-840 and ODM-840 Remote Routers: The FEC method used by the remote site
CDM‐840 and ODM‐840 Remote Routers depends on the direction of signal processing in use:
•
The 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).
•
The Tx (transmit) side of the 840 uses the VersaFEC® family of short‐block LDPC codes.
•
Appendix B. FEC (FORWARD ERROR CORRECTION) OPTIONS in the Comtech EF
Data CDM-840 Remote Router Installation and Operation Manual (CEFD P/N
MN-CDM840)
•
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 CDM-800 Gateway Router via the CTOG-250 Comtech Traffic Optimization Gateway:
The hub site CDM‐800 uses the FEC method based upon the DVB‐S2 standard for QPSK, 8‐PSK,
16‐APSK and 32‐APSK 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)
A–2
MN-CDD880
Revision 2
Advertisement
Table of Contents
