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Free Capacity Allocation (FCA) is one of the types of allocation available in OpenSAND (consult the DAMA page for more information).
A terminal is allocated the FCA capacity on each allocation loop if there is remaining capacity after performing the CRA, RBDC and VBDC] allocations.
If a terminal is used configured to use DAMA (refer to the DAMA page for more information), then it is susceptible of being allocated FCA, up to the rate specified by fca if there is remaining capacity during one allocation loop. This value can be configured in the dvb_ncc section of the gateway configuration, on the Advanced Configurations window.
By default, each terminal has a Free Capacity Allocation of 0 kbits/s.
There are several probes that allow the user to inspect the FCA allocations on the gateway:
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STX_allocation.FCA_allocation: the FCA allocation for the STX, in kbits/s. -
Spot_X.NCC.FCA_allocated: the total FCA allocation for the Spot X, in kbits/s.
On the terminal side, there are no probes specific to FCA, and FCA can only be observed through the Total Allocation probe: while there is no traffic, and therefore, no capacity requests, the total allocation is equal to the CRA + FCA.
FCA allocations are computed on the gateway by the DamaCtrl. They are the last type of allocation to be computed.