Cycles Per Burst Map; Slot Guardband; Figure 3-13 Cycles Per Burst Map Prompt; Figure 3-14 Slot Guardband Prompt - 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

Cycles Per Burst Map

This menu item, which appears for all Hub types except Dynamic Cycle and
GIR, displays the number of spin cycles that will occur prior to each broadcast
of the Burst Map by the burst controller to the remotes. One cycle is the amount
of time it takes for all remotes in a group to burst on the common channel. The
burst map provides each remote with its allocated bandwidth and position in the
cycle.
For Dynamic Cycle and GIR configurations, the number of cycles is automati-
cally set to one in order to ensure optimum performance for these Hub types.
This parameter can be modified from the Hub CDM-570/570L by entering a C
at the command prompt as shown in figure 3-13.
Figure 3-13 Cycles per Burst Map prompt
On Remote units, this menu item is an information-only display.

Slot Guardband

This menu item, which appears for all Hub configurations, displays the current
length of the Slot Guardband in milliseconds and in bytes for the remotes in the
group. The Slot Guardband is the amount of time between the point when one
remote completes transmitting data and the point when the next remote in the
cycle begins transmitting. This prevents the remote from overrunning the next
terminal in the cycle. The setting for this parameter should be obtained using the
Vipersat STDMA Calculator.
On a Hub unit, this value can be modified by entering G at the command
prompt to display the dialog shown in figure 3-14 and entering a new value.
Figure 3-14
Slot Guardband prompt
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 - 3-15