Status Items; Ber Testing; Acm Modulator Status; Acm Demodulator Status - Comtech EF Data CDM-760 Installation And Operation Manual

Appendix E
CDM-760 Advanced High-Speed Trunking Modem
E.3.3 Status Items
Status items are not strictly part of the Statistics but are important items used for
monitoring for current conditions.
E.3.4 BER Testing
Item
ModCod Selection
PN Sequence Test On/Off
BER Test Result
E.3.5 ACM Modulator Status
Item
Current Tx ModCod
Remote Es/No Reading
E.3.6 ACM Demodulator Status
Item
Rx ModCod
Local Es/No Reading
E.3.7 CnC Status
Item
CnC PSD Ratio
CnC Ratio (Power)
CnC frequency offset
CnC Delay
Comments
Allows selection of ModCod for test.
Enable / Disable Test.
Test results – continuous. PN data is generated in the Framer (Fig. G-1 Block 6) and recovered in
the Deframer (Fig. G-1 Block 5).
Comments
Currently active Tx ModCod.
Es/No from distant end.
Comments
Currently active Rx ModCod.
Es/No of local demodulator.
Comments
Power Spectral Density (PSD) ratio at local end.
PSD = Interferer - Distant, density (dB).
Power Ratio at local end.
CnC Ratio = Interferer - Distant, power (dB).
∆F between Interferer and Distant carriers.
Round trip delay of Tx carrier in ms (measured in Fig. G-1 Block 8).
E–4
Revision 4
MN-CDM760