Definition of tie line in US English:

tie line


  • A transmission line connecting parts of a system, especially a telephone line connecting two private branch exchanges.

    • ‘They connect only through tie lines where power must be converted from alternating current to direct current and back again.’
    • ‘The access points are interlinked with additional infrastructure including switches and tie lines.’
    • ‘Queuing for callers on hold is performed at the edge of the network, helping reduce the need for overflow ports and expensive tie lines between multisite contact centers.’
    • ‘We utilized radio tie lines.’


tie line

/ˈtī ˌlīn/