A leased line is a symmetric telecommunications line connecting two locations. It is sometimes known as a 'Private Circuit' or 'Data Line' in the UK. Unlike traditional PSTN lines it does not have a telephone number, each side of the line being permanently connected to the other. Leased lines can be used for telephone, data or Internet services. Some are ringdown services, and some connect two PBXes. Symmetry is a characteristic of geometrical shapes, equations and other objects; we say that such an object is symmetric with respect to a given operation if this operation, when applied to the object, does not appear to change it. ... Telecommunication involves the transmission of signals over a distance for the purpose of communication. ... The public switched telephone network (PSTN) is the concatenation of the worlds public circuit-switched telephone networks, in much the same way that the Internet is the concatenation of the worlds public IP-based packet-switched networks. ... For other uses, see Telephone (disambiguation). ... For other uses, see Data (disambiguation). ... Ringdown: In telephony, a method of signaling an operator in which telephone ringing current is sent over the line to operate a lamp or cause the operation of a self-locking relay known as a drop. ... PBX redirects here. ...

In the U.K., leased lines are usually available at speeds of 64k, 128k, 256k, 512k, 2M and provided to the customer on X.21 presentation. Higher speeds are available on alternative interfaces. “UK” redirects here. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ...

In the U.S., low-speed leased lines (56 kbit/s and below) are usually provided using analog modems. Higher-speed leased lines are usually presented using FT1 (Fractional T1): a T1 bearer circuit with 1 to 24 56k or 64k timeslots. Customers must manage their own network termination equipment—Channel Service Unit or Data Service Unit (CSU/DSU). For other uses of terms redirecting here, see US (disambiguation), USA (disambiguation), and United States (disambiguation) Motto In God We Trust(since 1956) (From Many, One; Latin, traditional) Anthem The Star-Spangled Banner Capital Washington, D.C. Largest city New York City National language English (de facto)1 Demonym American... For the guitar distortion pedal, see BOSS DS-1. ... Time division multiple access (TDMA) is a channel access method for shared medium (usually radio) networks. ... CSU/DSU is a commonly used of combination of two telecommunications abbreviations. ...

For many purposes, leased lines are gradually being replaced by DSL links. DSL may refer to: Damn Small Linux Dark and Shattered Lands, a MUD based loosely on Forgotten Realms and Dragonlance books. ...

See also

• Dedicated line
• Dry pair
• Private line
• Tie line