Product specifications

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 t
he CDM-840 and ODM/R-840 Remote Routers: The FEC method used by the remote site
CDM-840, ODM
-84
0, and ODMR-840 Remote Routers depends on the direction of signal
processing in use:
• The rec
eive (Rx) side of the 840 operates with error correction based upon the DVB
-S2
st
andard for QPSK, 8PSK, 16APSK and 32APSK with concatenated Low Density Parity
Code (LDPC) and Bose
-Chau
dhuri
-Hocq
uenghem (BCH).
• The tr
ansmit (Tx) side of the 840 uses the VersaFEC® family of short
-block L
DPC codes.
• Appendi
x 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 t
he CDD-880 Multi Receiver Router: The FEC method used by the hub site CDD
-880 Mul
ti
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).
Appendi
x 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)