This object determines whether FlowControl should be used.
If disabled(2), no FlowControl will be initiated by this port.
Any FlowControl requests received will be dropped.
If enabled(3), this port will initiate and observe FlowControl
requests as specified by the objects nbsCmmcPortFCRecvOper
and nbsCmmcPortFCSendOper. Those settings may be changed
through the related nbsCmmcPortFCSendAdmin and
nbsCmmcPortFCRecvAdmin objects.
If notSupported(1), this object is not supported.