Scpc step up excess, Stdma slot capacity, Stdma switch delay – Comtech EF Data CDM-570/L Vipersat Parameter Editor User Manual
Page 63: Percent allocation
Chapter
2 -
Using Parameter Editor
2-47
Vipersat
Typically, the default value will be acceptable, but this value can be changed to
accommodate a unique network configuration or application.
SCPC Step Up Excess
Appears for Remote modems only.
The SCPC Step Up Excess field allows adding a fixed percentage to the chan-
nel bandwidth request to accommodate additional bandwidth requirements
which may occur after a switch is made. This excess is added each time an
SCPC Step Up switch occurs, and makes additional bandwidth available for
when the demand arises while minimizing Step Up switching events.
A default value is provided and need not be changed unless it is known that
there will be a larger bandwidth requirement after the switch.
STDMA Slot Capacity
Appears for Hub modems only.
The STDMA Slot Capacity field allows setting the threshold or level of slot
capacity at which the Burst Controller sends a switch request to the VMS to
switch the Remote from STDMA mode to SCPC mode.
Typically, the default value will be acceptable, but this value can be changed to
accommodate a unique network configuration or application.
STDMA Switch Delay
Appears for Hub modems only.
In order to minimize unnecessary switching due to transient conditions, such as
a temporary spike in network traffic for example, the STDMA Switch Delay
parameter is provided. This setting is used to specify a delay before the Burst
Controller sends a switch request to the VMS to switch the Remote from
STDMA mode to SCPC mode.
Typically, the default value will be acceptable, but this value can be changed to
accommodate a unique network configuration or application.
Percent Allocation
Appears for Hub modems only.
The Percent Allocation field 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, this value can be increased. In