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., leased lines are usually presented on a T1 bearer circuit in a number of 56k or 64k timeslots. Advantages this has over the system in the UK are more than one logical connection can be provided on a single bearer, and upgrades can take place relatively easily. However, the customer must manage their own network termination equipment—Channel Service Unit or Data Service Unit (CSU/DSU).
See also
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