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Chapter 18 Frame Relay
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Frame Relay Frame Relay is a virtual-circuit technology that provides low-level(physical and data link layer) service in response to following demands. Higher data rate at lowest cost Bursty Data Less overhead due to improved Transmission Media
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Frame Relay versus Pure
Figure 18-1 Frame Relay versus Pure Mesh T-Line Network
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Fixed-Rate versus Bursty Data
Figure 18-2 Fixed-Rate versus Bursty Data
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Figure 18-3 X.25 Traffic
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Advantages Frame Relay operates at higher speed.
It allows bursty data. It allows frame size of 9000 byte. Frame relay is less expensive than other traditional WAN.
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Disadvantage Some time it doesnot support for high data rate.
Frame relay allows variable-length frames. This may delays for different users. Frame relay is not suitable for sending delay sensitive data such as real-time voice or video. Eg Teleconferencing.
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Figure 18-5 Frame Relay Network
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Figure 18-6 DLCIs
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Types of connection in Frame Relay
Permanent Virtual Circuit (PVC) Switch Virtual Circuit (SVC)
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Permanent Virtual Circuit (PVC )
Figure 18-7 Permanent Virtual Circuit (PVC )
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Figure 18-8 SVC Setup and Release
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Figure 18-9 SVC DLCIs
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Figure 18-10 DLCIs Inside a Network
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Figure 18-11 Frame Relay Switch
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Figure 18-12 Frame Relay Layers
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Comparing Layers in Frame Relay and X.25
Figure 18-13 Comparing Layers in Frame Relay and X.25
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Figure 18-14 Frame Relay Frame
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Figure 18-15 BECN
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Figure 18-16 FECN
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Four Cases of Congestion
Figure 18-17 Four Cases of Congestion
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Figure 18-18 Leaky Bucket
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A Switch Controlling the Output Rate
Figure 18-19 A Switch Controlling the Output Rate
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Flowchart for Leaky Bucket Algorithm
Figure 18-20 Flowchart for Leaky Bucket Algorithm
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End……
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Example of Leaky Bucket Algorithm
Figure 18-21 Example of Leaky Bucket Algorithm
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Relationship between Traffic
Figure 18-22 Relationship between Traffic Control Attributes
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User Rate in Relation to Bc and Bc + Be
Figure 18-23 User Rate in Relation to Bc and Bc + Be
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Figure 18-24 Three Address Formats
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Figure 18-25 FRAD
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