Tie line

A tie line, also known as a tie trunk, is a telecommunication circuit between two telephone exchanges or two extensions of a private telephone system.[1][2]

See also

References
  1. Atis, Tie Trunk, retrieved 2015-06-08
  2. YourDictionary.com, American Heritage Dictionary, YourDictionary.com: Tie Line, archived from the original on 2007-06-20, retrieved 2015-06-07
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