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 for Data Terminal Equipment
From The Free On-line Dictionary of Computing (30 December 2018) :

  Data Terminal Equipment
      (DTE) A device which acts as the
     source and/or destination of data and which controls the
     communication channel.  DTE includes terminals, computers,
     protocol converters, and multiplexors.
     DTE is usually connected via an EIA-232 serial line to
     Data Communication Equipment (DCE), typically a modem.  It
     is necessary to distinguish these two types of device because
     their connectors must be wired differently if a
     "straight-through" cable (pin 1 to pin 1, pin 2 to pin 2 etc.)
     is to be used.  DTE should have a male connector and should
     transmit on pin three and receive on pin two.  It is a curious
     fact that many modems are actually "DTE" according to the
     original standard.

Contact=webmaster@dict.org Specification=RFC 2229