Comtech EF Data SLM-5650A - Manual (Page 321)

SLM5650A_CDM625 Satellite Modem Revision 8
DoubleTalk Carrier-in-Carrier Option MN-SLM5650A
15–23
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 -7
[ 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]