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data channel

资料来源 : Free On-Line Dictionary of Computing

data channel
     
         A channel (on a {BRI} or {PRI} line) used to
        carry control information, to set up connections on the
        associated {bearer channels}.  The name wasn't too bad back
        when users were sending voice (not data) over the {bearer
        channels}, but in 1997 it's quite a misnomer.
     
        (1997-03-10)
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