Comtech EF Data CDM-570/570L Vipersat - Manual (Page 77)

Chapter 3 - Using the Command Line Interface (CLI) 3-41
Vipersat Configuration
Percent Allocation
This menu item appears for Hub modems only.
The Percent Allocation menu item allows adding a fixed percentage to the
channel bandwidth request to accommodate additional bandwidth requirements
which may occur after the switch is made from STDMA to SCPC mode.
Typically the default value (10%) will be sufficient, but if there may be a larger
bandwidth requirement after the switch, the percent allocation value can be
increased. In choosing a value for this allocation, future bandwidth require-
ments for the channel must be balanced against efficient bandwidth utilization.
To change this setting, enter E at the command prompt in the Auto Switching
screen to display the dialog shown in figure 3-50.
Figure 3-50 Percent Allocation prompt
SCPC Step Up Threshold
This menu item appears for Remote modems only.
The SCPC Step Up Threshold establishes the percentage of bandwidth use
that will trigger a switch up from the present SCPC rate to a higher rate to
ensure that there is sufficient bandwidth available for current conditions.
A default value (95%) is provided, but if a different threshold is desired, an
alternate value can be specified by entering U at the command prompt in the
Auto Switching screen to display the dialog shown in figure 3-51. Note that
this value must be greater than the value specified for the SCPC Step Down
Threshold.
Figure 3-51 SCPC Step Up Threshold prompt