Comtech EF Data CDM-425, Installation And Operation Manual

Page: 201 / 744

CDM-425 Advanced Satellite Modem
Revision 0
Front Panel Operation 6–83 MN-CDM-425
6.2.3.4 Monitor: Statistics
This display shows the statistics data that has been measured and recorded. To enable statistics
logging, see Sect. 6.2.1.10.4. For statistics logging, you first define a measurement interval (see
CONFIG: Stats).
The top line displays the statistics log entry number, followed by that log entry’s statistical
content. You may view up to 255 statistics log entries. Use the ▲▼ arrow keys to scroll
backwards or forwards through the entries. The bottom line indicates the time and date of the
entry shown in DAY-MONTH-YEAR format.
Press ENTER or CLEAR when done viewing to return to the previous menu, or use the
◄ ►
arrow keys to select the Clear-All option. Then, at the prompt, use the
▲▼ arrow keys to
select Yes or No and press ENTER to execute. The statistics buffer will be purged of all entries.
6.2.3.4.1 Monitor: Statistics Examples
In all modes except IP-ACM or V2-ACM:
Stats 114: 16.0,16.0,9.0,9.0,16.5,16.5
17/11/14 14:48:06 Clear-All: No (N/Y)
The modem calculates and then displays, on the top line from left to right, statistics data as
follows:
•
(16.0,16.0) First, the Eb/No is calculated: The minimum Eb/No value observed in the
measurement interval is provided first, and then the average Eb/No observed value
follows. The screen displays 16.0 only if the measured values are
≥
16.0 dB.
•
(9.0,9.0) Next, the Transmit Power Level Increase (TPLI) is calculated: The maximum
TPLI observed in the measurement interval is provided first, and then the average TPLI
observed value follows.
•
(16.5,16.5) Finally, the Receive Signal Level (RSL) is calculated (note that both values
are negative): The minimum value observed in the measurement interval is provided first,
and then the average RSL observed value follows.
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’ (i.e., the
display shows ‘Loss,Loss’).
In addition, If AUPC is not enabled, the values of maximum and average TPLI
will both show ‘0.0'.