Comtech EF Data SLM-5650A Installation And Operation Manual page 321

SLM5650A_CDM625 Satellite Modem
DoubleTalk Carrier-in-Carrier Option
PSD Ratio
Ratio of Power Spectral Density (PSD) of the interfering carrier to the desired carrier.
If looking at the two carriers side-by-side on a
spectrum analyzer:
Quasi Error Free (QEF)
Quasi Error Free (QEF) corresponds to PER ~10
[Note: 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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15–23
Revision 8
MN-SLM5650A