LEASED LINE

A 'leased line' is a symmetric telecommunications line connecting two locations. 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.
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.
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 many purposes, leased lines are gradually being replaced by DSL links.

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See also

See also

★ Dedicated line

★ Dry pair

★ Private line

★ Tie line