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. Unit 3 Kaplan University IT530 Professor Jeffrey Robinson August 20, 2013 Abstract In this discussion we look at some of the history around frame-relay. We then look at some of the equipment necessary to create the frame relay connections, as well as how the connections work both logically and physically. Some limiting factors are discussed as well as committed information rates, burst rates, an error handling. Some of the positive aspects of frame-relay are identified along with some options for the future of WAN technologies. Frame-Relay Operating at the physical and datalink layers of the OSI model, frame relay is a high-performing WAN protocol. It was…show more content…
This allows frame-relay to provide a low cost of ownership while adhering to standards and internetworking with other services. A highly reliable WAN may be achieved through frame-relay and a good service level agreement (SLA) from the provider. Frame-relay can be thought of as a simple principle because it allows the higher-level protocols to deal with many of the problems. Although, it can include optional features such as congestion notification and signaling mechanisms. Ideally, a committed information rate (CIR) is selected that best meets the needs of the customer. This is the maximum burst rate, which when exceeded can cause the frames to be discard eligible (DE). In reality, the nature of frame-relay allows all bits to be discard eligible, but the error correction is handled by the upper layers. Some configurations allow speeds to burst above the CIR, but never more than the physical capacity of the circuit. The DLCI is the connection identifier for the PVC in the connection oriented datalink protocol that is frame-relay. By switching variable length frames, statistical multiplexing is achieved. Even though frame-relay may be susceptible to traffic delays it can still be optimized for delay sensitive traffic such as voice over IP. Because the frame-relay path is known, it is used to connect the customer premises equipment (CPE) to the frame-relay switch. The LMI keep alive signaling happens
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