Define the middle threshold to receive packets from the HSB. This parameter is relevant when the receive buffer is almost full. When the buffer reached this threshold, the only packets that the port will receive will be those with the highest priority (1) who were already written in the priority machine. All other packets will be rejected. The space between empty1 to empty0 is reserved to packets with the highest priority (1) who were already written in the priority machine. Version 7.0