User guide

Chapter 3 - Using the Command Line Interface (CLI) 3-13
Vipersat Configuration
The target CDM-570/570L Group ID can be modified by entering an I at the
command prompt to display the dialog shown in figure 3-10.
Figure 3-10 Group ID prompt
STDMA Power Hunt
This menu item appears for Remote modems only.
Should link reception from a Remote be incorrect or impaired (e.g., poor envi-
ronmental conditions), the STDMA Power Hunt feature is an option on the
Remote modem that automatically adjusts the Remote transmit power to ensure
that burst map acknowledgements from that unit are received by the Hub burst
controller. When enabled, the burst controller sets a flag in the burst map that
indicates it is not receiving acknowledgements from an enabled Remote. When
the Remote receives the burst map, it will see the flag and automatically
increase power by 3 dB above the default or Home State setting. If this closes
the link, the burst controller will clear the flag. Note that if the 3 dB increase is
more than is necessary, DPC will make a down adjustment to the appropriate
level and this adjustment will be added to the DPC Offset.
This feature option is Enabled/Disabled by entering H at the command prompt.
Low Data Rate Fast Acquisition
This menu item is a toggle used to Enable or Disable the Vipersat Burst Fast
Acquisition Timing (BFAT) feature that functions at low data rates (64 kbps to
256 kbps). This feature allows for significantly faster acquisition times at these
data rates, even with higher noise, resulting in improved efficiency of the shared
STDMA channel. Since signal lock is faster at higher data rates, BFAT is not
active above 256 kbps.
Entering A at the command prompt will toggle this feature On or Off.
This feature requires Base Modem firmware version 1.5.2 or later, together with
Router firmware version 1.5.3 or later. Modems must be operating at either 3/4
QPSK or .95 QPSK in order to utilize BFAT.