Flag indicating if CAC failures due to buffer threshold calculations should be disabled on a shelf-wide basis. Per-direction, per-port, and per-traffic class settings may override this variable for a specific direction, port, or traffic class if enabled and available. For VC or VP cross connects already in the 'active' state, CAC has already taken place and modifying this objects value will not force CAC to run again on these VC/VP cross connects unless they are set to a notInService state and then set to 'active' or if a CSM reboot is performed.