Comtech EF Data CDM-750, Installation And Operation Manual

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CDM-750 Advanced High-Speed Trunking Modem Revision 2
Appendix G MN-CDM750
G–4
G.3.3 Status Items
Status items are not strictly part of the Statistics but are important items used for
monitoring for current conditions.
G.3.4 BER Testing
Item Comments
ModCod Selection Allows selection of ModCod for test.
PN Sequence Test On/Off Enable / Disable Test.
BER Test Result
Test results – continuous. PN data is generated in the Framer (Fig. B-1 Block 6) and recovered in
the Deframer (Fig. B-1 Block 5).
G.3.5 ACM Modulator Status
Item Comments
Current TX ModCod Currently active Tx ModCod.
Remote Es/No Reading Es/No from distant end.
G.3.6 ACM Demodulator Status
Item Comments
Rx ModCod Currently active Rx ModCod.
Local Es/No Reading Es/No of local demodulator.
G.3.7 CnC Status
Item Comments
CnC PSD Ratio
Power Spectral Density (PSD) ratio at local end.
PSD = Interferer - Distant, density (dB).
CnC Ratio (Power)
Power Ratio at local end.
CnC Ratio = Interferer - Distant, power (dB).
CnC frequency offset ∆ F between Interferer and Distant carriers.
CnC Delay Round trip delay of Tx carrier in ms (measured in Fig. B-1 Block 8).