Percent Allocation; Scpc Step Up Threshold - Comtech EF Data Vipersat CDM-570 User Manual

V i p e r s a t C o n f i g u r a t io n
Figure 3-40
STDMA Switch Delay prompt

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 3-41.
Figure 3-41
Percent Allocation prompt

SCPC Step Up Threshold

This menu item appears for the Remote modem 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.
Typically the default value will be optimum, 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 3-42. Note that this value must be greater than the value specified for the
SCPC Step Down Threshold.
C h ap t e r U s i n g t h e C o m m a n d L in e I n t e r f a c e ( C L I )
3 - 3-35