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Chapter 15. Frame Relay Concepts > Foundation Topics

Foundation Topics

With point-to-point serial links, a company orders a leased line, or circuit, between two points. The telco creates the circuit, installing a two-pair (four-wire) cable into the buildings on either end of the circuit. The telco creates the circuit so that it will run at the preset speed requested by the customer, typically some multiple of 64 kbps. To complete the circuit, the cable at each end must be connected to a CSU/DSU, which is in turn connected to a router serial interface. Once connected and configured, the routers can send data over the link in both directions.

Frame Relay is a set of WAN standards that create a more efficient WAN service as compared to point-to-point links, while still allowing pairs of routers to send data directly to each other. With leased lines, each leased line requires a serial interface on each router and a separate (and expensive) physical circuit built by the telco. Frame Relay supports the ability to send data to multiple remote routers over a single physical WAN circuit. For example, a company with one central site and ten remote sites would require ten leased lines to communicate with the main site and ten serial interfaces on the central site router. With Frame Relay, the main site could have a single leased line connecting it to the Frame Relay service, and a singl....


  

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