CDM-840 Remote Router MN-CDM840
Appendix D Revision 3
D–4
Figure D-1. VersaFEC Codes vs. Constrained Capacity
D.2.1 VersaFEC ACM Latency
Examining the data in Table D-2, latency for each ModCod is shown for the example of VersaFEC
ACM at a fixed 100 ksymbols/second rate. Of particular note is that even though the ModCods
span a 7:1 variation in throughput, the latency is only varying between 25 and 34 milliseconds.
In the example shown the worst-case latency for this ACM scheme is 34 milliseconds.
Table D-2. VersaFEC Implementation of ACM – 100 ksymbols/sec Example Case
ModCod Modulation Code Rate
bps/Hz
Bit rate (throughput)
In milliseconds
OVERALL SYSTEM LATENCY = Worst-case ModCod (ModCod0)
Latency = 34 milliseconds, NOT INCLUDING WAN BUFFER OR SATELLITE PATH
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