Chapter 18 Virtual Circuit Switching:Frame Relayand ATM
18.1 Virtual Circuit Switching Global Addressing Virtual Circuit Identifier Three Phases Data Transfer Phase Setup Phase Teardown Phase
Figure 18.1Virtual circuit wide area network
Figure 18.3VCI phases
Figure 18.4Switch and table
Figure 18.5Source-to-destination data transfer
Figure 18.6SVC setup request
Figure 18.7SVC setup acknowledgment
18.2 Frame Relay Architecture Frame Relay Layers FRAD VOFR LMI
Figure 18.8Frame Relay network
Note: VCIs in Frame Relay are called DLCIs.
Figure 18.9 Frame Relay layers
Note: Frame Relay operates only at the physical and data link layers.
Figure 18.10Frame Relay frame
Note: Frame Relay does not provide flow or error control; they must be provided by the upper-layer protocols.
Figure 18.11Three address formats
18.3 ATM Design Goals Problems Architecture Switching Layers
Figure 18.13Multiplexing using different frame sizes
Note: A cell network uses the cell as the basic unit of data exchange. A cell is defined as a small, fixed-sized block of information.
Figure 18.14Multiplexing using cells
Figure 18.15ATM multiplexing
Figure 18.16Architecture of an ATM network
Figure 18.17TP, VPs, and VCs
Figure 18.18Example of VPs and VCs
Note: Note that a virtual connection is defined by a pair of numbers: the VPI and the VCI.
Figure 18.19Connection identifiers
Figure 18.20Virtual connection identifiers in UNIs and NNIs
Figure 18.21An ATM cell
Figure 18.22Routing with a switch
Figure 18.23ATM layers
Figure 18.24ATM layers in endpoint devices and switches
Figure 18.25ATM layer
Figure 18.26ATM headers