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From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:

           A digital signaling interface
          recommended by {ITU-T} that includes specifications for
          {DTE}/{DCE} physical interface elements, alignment of {call
          control} characters and error checking, elements of the call

          control phase for {circuit switched} services, data transfer
          at up to 2 {Mbps}, and {test loops}.  64 {kbps} is the most
          commonly used transfer rate.

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