Comtech EF Data CDM-570/570L Vipersat - Manual (Page 51)

Chapter 3 - Using the Command Line Interface (CLI) 3-15
Vipersat Configuration
Figure 3-12 STDMA Max Power Hunt prompt
Low Data Rate Fast Acquisition
Configurable on a Hub Burst Controller only.
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.
Note: Use of BFAT is NOT recommended with ECMv2.
When this feature is enabled with any other allocation method, the
Preamble parameter becomes fixed (not settable by the user) and this
value is automatically determined by the system—appears as display
only in the CLI; not displayed in the Parameter Editor.
Burstmap Multicast IP
This menu item is used to define the IP address for the Burstmap Multicast that
is sent out by the STDMA burst controller at the Hub to all of the associated
remotes in that group. This address must be the same for all members of the
group. The burstmap is a proprietary message sent from the Hub to all remotes,
at regular intervals, specifying the relative start time and duration for each
terminal to transmit.
To change the current address, enter N at the command prompt to display the
dialog shown in figure 3-13.
NOTE