Basically all types of topology are allowed to connect devices, which give a big advantage towards the endless possibilities of scalability in the design. Still there are 3 levels for interconnection within the topology as shown in Diagram 3.
One line can have up to 64 devices, so if we want to connect more components into that line it is not possible. The solution is to put a main line with two line couplers (e.g. AL1 and AL2), for AL1 we can have up to 64 devices including the coupler and the same is for AL2. This expansion continues on the main line for up to 15 lines as shown in Diagram 3 and it becomes an Area, which the again can be connected to a Line Area. The Line Area can have up to 15 areas. It is very important to notice that each Line has to have a coupler and its own source, regardless of what type of line it is. The source and coupler are crucial as they physically separate the lines and areas, and are responsible for correct routing. Each Line regardless of its type can also support up to 64 devices, including the couplers. By adding up all the devices, a complete system can support up to 14.400 devices.
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