Margin; Max Data Rate; Max Code Rate; Max Modulation - Comtech EF Data Vipersat SLM-5650A User Manual

V i p e r s a t C o n f i g u r a t io n
Power button is clicked. Any modifications to the settings for Margin, Max
Data Rate, Max Code Rate, and/or Max Modulation will require re-calculation
of the Maximum Power value.
If the calculator returns an error [ ], either the base level is too high or
INVALID
the calibration parameter settings have exceeded the capacity of the equipment
and must be modified.

Margin

The DPC Margin parameter is one of the Max Power calibration settings. This
value is the offset between the current power level and the upper power limit for
the waveform, and should match the fade margin that has been purchased.
Margins are used to compensate for signal attenuation (e.g., rain) and define
link availability.
To modify this parameter, enter a value from 0.0–15.0 dB, then click the
Submit button. The default value is 5.0 dB.

Max Data Rate

The Max Data Rate parameter is one of the Max Power calibration settings.
This value is the maximum achievable rate as calculated from the link budget-
ary numbers for this site.
To modify this parameter, enter a data rate, then click the Submit button. Note
that the valid range for the data rate will vary depending on the Modulation type
and Code Rate. The default setting is 1024000 bps.

Max Code Rate

The Max Code Rate parameter is one of the Max Power calibration settings.
This value is the maximum achievable rate as calculated from the link budget-
ary numbers for this site.
Use the pull-down menu to select the required rate, then click the Submit
button. Note that when operating in Vipersat mode, Rates of 1/2, 2/3, and 1/1
are not valid. The default setting for this parameter is Rate 3/4.

Max Modulation

The Max Modulation parameter is one of the Max Power calibration settings.
This setting is the maximum achievable modulation as calculated from the link
budgetary numbers for this site.
Use the pull-down menu to select the required modulation, then click the
Submit button. The default setting for this parameter is QPSK.
C h a p t e r 3 - U s i n g t h e W e b S e r ve r I n t e r f a c e ( W S I ) 3-37