Leased line
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A leased line is a symmetric telecommunications line connecting two locations together. Unlike traditional PSTN lines they do not have a telephone number, each side of the line being permanently connected to the other. They can be used for telephone, data or Internet services.
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 (56Kbps 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. This is adventageous over UK systems in that more than one logical connection can be provided on a single bearer and upgrades can take place with relative ease. The customer, however, must manage their own network termination equipment—Channel Service Unit or Data Service Unit (CSU/DSU). as For many purposes, leased lines are gradually being replaced by DSL links.
