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Leased Lines & Dial-up
According to , the leased line is a point-to-point type of circuit, with both end points identifiable by the telephone services provider. The user has no knowledge of where or how the circuit is routed between the two end-points. Information is transmitted along dedicated secure channels providing data rates from 64 kbps to 45 Mbps.
On the other hand, dial-up Internet access uses telephone lines for Internet access. User’s computer has a modem which connects the telephone line to an Internet service provider’s (ISP) node, and establishes a modem-to-modem link to transfer Internet Protocol (IP) packets between user’s equipment and hosts. Modern dial-up modems have a maximum speed of 56 kbps. The coverage can be as far as the telephone lines can reach.
Point-to-point circuits are cost effective for high-speed communication between two devices, but are more expensive when compared to dial-up applications where the circuit is connected and charged only for the duration of the connection. Low speed point-to-point voice-grade circuits are known in the industry as 3002 circuits. Voice-grade circuits can carry uncompressed data from the slowest speed up to 19.2 kbps. Higher speeds (up to 56 kbps) can be carried with data compression.
Leased lines and dial-up networks provide quick connections to various facilities and devices that cannot otherwise be reached in a structured network.
 The Intelligrid, "Data over Voice Lines". URL: http://intelligrid.ipower.com/IntelliGrid_Architecture/New_Technologies/Tech_Data_over_Voice_Lines.htm
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