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Vipersat Configuration
3-10 Vipersat CDM-570/570L User Guide
1 -- Fixed
In the Fixed mode, all remotes have the same slot size regardless of type of traf-
fic or load.
2 -- Dynamic Slot
In the Dynamic Slot mode, the slot size for each remote is computed based on
the time (at the current data rate) needed to transmit all the Bytes in Queue. If
the result is less than the minimum slot size or more than the maximum slot
size, the slot is adjusted accordingly.
3 -- Dynamic Cycle
In the Dynamic Cycle bandwidth allocation method, available bandwidth is
allocated to remotes proportionally based on their current bandwidth needs. The
bandwidth requirements are determined by the number of bytes in queue for
each remote divided by the total number of bytes in queue for all remotes to
determine the percentage of bandwidth to allocate for each remote.
4 -- GIR
In the GIR mode, the initial computed slot size value is the same as the
Dynamic Cycle mode except there is no maximum limit. After all remotes have
been assigned slots, the burst map is checked to see if the total cycle length
exceeds 1 second. If not, then all requirements are satisfied and the burst map is
complete. However, if the cycle is greater than one second, then the slots are
adjusted proportionally so that all remotes receive at least their guaranteed rate
plus whatever excess is still available.
In this software version, when the 1 second restriction is exceeded, remotes
without a specified GIR are reduced to the global minimum slot size and the
remaining bandwidth is distributed to remotes that have been assigned a GIR
rate. Remotes assigned a GIR are given available excess bandwidth when
needed.
Note: GIR allocations are restricted so that assigned GIR totals cannot
exceed the available bandwidth to insure proper bandwidth allo-
cation when the network is overloaded.
5 -- Entry Channel
The Entry Channel mode is the same as Dynamic Cycle mode, except that as
soon as the hub receives an STDMA ACK, it initiates a switch to SCPC mode
based on the policy set for that remote.
NOTE