A dedicated symmetric telecommunications line connecting two locations. It may also carry Internet traffic. A leased line provides high speed circuit (up to 8Mbps) connectivity. It is sometimes known as a 'Private Circuit' or 'Data Line'.
Leased line requires a special digital modem CSU/DSU to modulate the signales over the provided circuit.
Who needs a leased line?
Generaly, leased lines are used for dedicated traffic requirements such as video conferencing, voice transmission, fast browsing, large files transfer, multimedia applications,.etc.