Comtech EF Data CDM-550T - Manual (Page 69)

CDM-550T Satellite Modem Revision 3
Front Panel Operation MN/CDM550T.IOM
6.2.6.3.2 (MONIT:) STATS (Link Statisics)
Select VIEW, CLEAR, or CONFIGURE, using the [
←] [→] arrow keys, then press ENTER.
If the user selects VIEW, the following screen is displayed:
(MONIT: STATS) VIEW
The user may scroll backwards or forwards through the entries in the statistics
log, using the [
↑] [↓] arrow keys. Pressing ENTER or CLEAR will take the user
back to the previous menu. The event log can store up to 250 events.
The top line of the display indicates the log entry number, and the time and date
of the entry. Note that in accordance with international convention, the date is
shown in DAY-MONTH-YEAR format.
The bottom line of the display shows the statistics data which has been measured
and recorded.
The meaning and format of the numbers is as follows:
Minimum Eb/No, Average Eb/No, Maximum TPLI, Average TPLI
(where TPLI means Transmit Power Level increase, if AUPC is enabled).
The user defines a measurement interval (see MONITOR, STATS,
CONFIGURE) 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.
Notes: 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
STA198:02/11/00 10:37:32
16.0,16.0,9.0,9.0(UP/DN)
LINK STATISTICS: VIEW
CLEAR CONFIGURE (ENTER)
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