In telecommunications, a private line is typically a telephone company service that uses a dedicated, usually unswitched point-to-point circuit, but it may involve private switching arrangements, or predefined transmission physical or virtual paths.
Most private lines connect only two locations, but some have multiple drop points.
If the circuit is used for interconnecting switching systems, including manual switchboards, it is often called a tie line.
In radio or wireless telephony, Private Line is a term trademarked by Motorola to describe an implementation of a Continuous Tone-Coded Squelch System (CTCSS), a method of using low-frequency subaudible tones to share a single radio channel among multiple users.
Advantages of private lines are: This article related to telecommunications is a stub.