QOS query

Hi Team,

 Queueing strategy: weighted fair
  Output queue: 0/50/64/1820 (size/max total/threshold/drops)
     Conversations  0/2/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1158 kilobits/sec


What does the highlighed portion mean? What is active and max total