Comtech EF Data CDM-Qx, Installation And Operation Manual

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CDM-Qx Satellite Modem Revision 6
Front Panel Operation MN/CDMQx.IOM
The user defines a measurement interval (see
Monitor
%
Stats
%
Config
) and during this
interval, Eb/No and TPLI are observed, at a one second rate. At the end of this period, the
average Eb/No is calculated and recorded, and the minimum value seen in the interval.
Similarly, the average TPLI is calculated, along with the highest value seen in the
interval.
Note:
If the demod has lost lock during the measurement interval, the minimum Eb/No
will show ‘
Loss
’ rather than indicate a value. However, the average value (while the
demod was locked) will still be calculated and shown. If, on the other hand, the
demodulator has been unlocked for the entire measurement interval, the average Eb/No
will also show ‘
Loss
’. (The display will show ‘
Loss, Loss
’.)
If the measured values are greater than, or equal to 16.0 dB, the display will show
16.0 dB. If AUPC is not enabled, the values of maximum and average TPLI will both
show ‘
Off
'.
Examples:
08.0, 13.5, 2.5, 1.8 means:
Minimum Eb/No observed in the measurement interval = 8.0 dB
Average Eb/No observed in the measurement interval = 13.5 dB
Maximum TPLI observed in the measurement interval = 2.5 dB
Average TPLI observed in the measurement interval = 1.8 dB
Loss, 04.5, Off, Off means:
There was a loss of demod lock during the measurement interval
Average Eb/No observed in the measurement interval = 4.5 dB
Maximum TPLI observed in the measurement interval = AUPC disabled
Average TPLI observed in the measurement interval = AUPC disabled
(Monitor
%
Stats
%
Clear-All) – CLEAR ALL STATS
If the user selects
Clear-All
, the statistics log is cleared and the user is taken directly
back to the previous menu.
Clear all Stored Stats?
No Yes ( ▲▼ , ENT)
Monitor
%
Stats
%
Config) – CONFIGURE STATS
If the user selects
Config
, the following submenu displays:
Stats Logging Interval:
Disabled ( ▲▼ , ENT)
Stats Logging Interval:
30 minutes ( ▲▼ , ENT)
5–48