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Definitions:

  A device that channels incoming data from any of multiple input ports to the specific output port that will take the data toward its intended destination.
Sources:
NISTIR 8183 from whatis.com
NISTIR 8183 Rev. 1 from whatis.com
NISTIR 8183A Vol. 1 from whatis.com
NISTIR 8183A Vol. 2 from whatis.com
NISTIR 8183A Vol. 3 from whatis.com

  A device that channels incoming data from any of multiple input ports to the specific output port that will take the data toward its intended destination. 
Sources:
NISTIR 8183 from whatis.com