tie line

noun

, Telecommunications.

1. a line that connects two or more extensions in a PBX telephone system.
2. a private telephone channel, leased from a telephone company, that connects two or more PBX systems.

tie line

noun

1. a telephone line between two private branch exchanges or private exchanges that may or may not pass through a main exchange

Example Sentences

The Planeteers were already aboard, except for Koa, who stood by to cast off the remaining tie line.

From Project Gutenberg

Thus, the points a′b′ represent conjugate solutions, and the line a′b′ is a tie-line.

From Project Gutenberg