- Private line
In wired
telephony , a private line ortie line is a service that involves dedicated circuits, private switching arrangements, and/or predefined transmission paths, whether virtual or physical, which provide communications between specific locations."Note:" Among subscribers to the
public switched telephone network (s), the term "private line" is often used to mean a one-party switchedtelephone line , as opposed to a party line."Source:
Federal Standard 1037C "CTCSS
In radio or
wireless telephony , "Private Line" is a term trademarked by Motorola to describe their 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. Each user group would use a different low frequency tone. Motorola's trade name (especially the abbreviation "PL") has become agenericized trademark for the method. General Electric used the term 'Channel Guard' to describe the same system and Other manufacturers used other terms. A later digital version of Private Line was called Digital Private Line, or DPL.ee also
*
Leased line
*Dedicated line
*Party line
*Lec billing
*IXC
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