Description: Use EB CAC or scr-pcr CAC? The per-link variable cacVersion may take on the values * SCR-PCR indicating that the old, pre Rel 4.2 CAC based on SCR and PCR values, is in operation or * EBT indicating that the new CAC based on effective bandwidths is used. cacVersion may be set by the manager. If cacVersion is set to EBT by the manager it will revert to SCR-PCR unless a valid EBT is currently available in memory (in which case cacEbtState==ready and cacCurrentEbtId holds a non-zero value). The cacVersion may also revert to SCR-PCR if, during boot or an EBT load, a valid EBT cannot be established in memory. A change of state in cacVersion will result in recalculatation of EB Sums.