Comtech EF Data CDM-625A, Installation And Operation Manual

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CDM-625A Advanced Satellite Modem MN-CDM625A
Appendix M Revision 4
M–15
Figure M-4. VersaFEC-2 Codes vs. Constrained Capacity (typical values shown)
M.7.1 VersaFEC-2 ACM latency
Section M.6.1 addresses latency in VersaFEC ACM mode. The analysis for VersaFEC-2 is proceeds
identically. The following table shows a summary for both VersaFEC-2 Long and Short Block
modes:
Min Throughput
@ 100 ksps
Max Throughput
@ 100 ksps
End-to-end Latency
VersaFEC-2 Short Block 48.9 kbps 415.3 kbps 40.4 ms
VersaFEC-2 Long Block 48.9 kbps 439.7 kbps 205 ms
Table M-5. VersaFEC-2 End-to-End Latency @ 100 ksps
As explained in Section M.6.1, these figures do not include the WAN buffer latency (where
used).