Comtech EF Data SLM-5650A Vipersat - Manual (Page 72)

Vipersat Configuration
3-32 Vipersat SLM-5650A User Guide
Percent Allocation
This parameter field appears for Hub modems only.
The Percent Allocation parameter 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 a value from 0–100% as shown in figure 3-36.
Figure 3-36 Percent Allocation field
SCPC Step Up Threshold
This parameter field 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 a value from 0–100% as shown in
figure 3-37.
Note that this value must be greater than the value specified for the SCPC Step
Down Threshold.
Figure 3-37 SCPC Step Up Threshold field
SCPC Step Down Threshold
This menu item appears for Remote modems only.
The SCPC Step Down Threshold establishes the percentage of bandwidth use
that will trigger a switch down from the present SCPC rate to a lower rate to
ensure efficient bandwidth usage.