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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Committed Information Rate
   CIR
      <networking> (CIR) The guaranteed average data rate of a
      virtual circuit in a frame relay network.  The CIR plus
      the Excess Information Rate (EIR, burst rate) is equal to or
      less than the speed of the access port into the network.
      The term CIR includes voice and non-data packets that are not
      included in the Committed Data Rate (CDR).  CIR is generally
      used in reference to leased lines and similar classes of
      network services, not dial-up.
      (2010-05-07)