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