Operating elements

Layered protocol architecture: basic concepts

Figure 1 - Service model

Figure 2 - Interactions between entities

Figure 3 - Data units

Figure 4 - Structuring data units

Figure 5 - Four service primitives

Figure 6 - Two possible timelines for service primitives

Figure 7 - Correspondence between entities and SAP

Figure 8 - Hierarchical addressing

Figure 9 - Hierarchical addresses

Figure 10 - Connection end

Figure 11 - Simplest multipoint

Figure 12 - Most complex multipoint system

Figure 13 - Multipoint to mobile center communication

Figure 14 - Multi-center communication

Figure 15 - Multiplexing and bursting

Figure 16 - Segmentation/reassembly

Figure 17 - Grouping/ungrouping

Figure 18 - Concatenation/separation

Figure 19 - Level concatenation (N) followed by level segmentation