Appendix J Revision 4
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
J–21
Quasi Error Free (QEF)
Quasi Error Free (QEF) corresponds to PER ~10
-7
PER (packet error rate) is based upon a 188 byte MPEG frame size.
Spectral Efficiency (SE)
Ratio of the Data Rate to the Symbol Rate.
Symbol Rate & Data Rate
Symbol Rate and Data Rate are related:
DR = SR * SE (Data Rate = Symbol Rate * Spectral Efficiency)
SR = DR / SE (Symbol Rate = Data Rate / Spectral Efficiency)
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