Comtech EF Data CDM-570 - Manual (Page 123)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Front Panel Operation MN/CDM570L.IOM
5–37
5.2.2.2.4.1 (MONITOR: Link Statistics) View
Sta198:02/11/02 10:37:32
16.0, 16.0, 9.0, 9.0(▲ ▼)
The statistics log can store up to 255 events. The top line indicates the log entry number, and the
time and date of the entry.
Note that in accordance with European convention, the date is shown in DAY-
MONTH-YEAR format.
The bottom line shows the measured and recorded statistics data. The meaning and format of the
numbers is as follows:
• Minimum E
b
/N
0
, Average E
b
/N
0
, Maximum TPLI, Average TPLI (where TPLI means
Transmit Power Level Increase, if AUPC is enabled).
• A measurement interval is defined (see MONITOR: Stats Æ Config). During this
interval, E
b
/N
0
and TPLI are observed, at a one second rate. At the end of this period, the
average E
b
/N
0
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 E
b
/N
0
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 E
b
/N
0
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 E
b
/N
0
observed in the measurement interval = 8.0 dB
Average E
b
/N
0
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 E
b
/N
0
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
Use the ▲ ▼ arrow keys to scroll backwards or forwards through the entries in the statistics log.
Press ENTER or CLEAR to return to the previous menu.