Geographic addressing

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Under geographic addressing refers to the specific response of certain plug-in, modules or assemblies according to their position , such as a slot. In principle, such a system requires either point-to-point connections with “intelligent” routers / switches / hubs or separate, star-shaped lines (also point-to-point) in an otherwise bus-shaped system . Geographic addressing is a plug and play solution .

Systems in which lines are only tapped multiple times cannot be geographically addressed from the outset; unless you measure the signal propagation time or attenuation. This is practically not done. This includes RS485 and the single-wire bus as well as all types of radio networks .

The advantages of geographic addressing:

• Traceable addressing path
• Several identical devices can be operated on one bus - no serial numbers are required

Many modern bus systems use geographical addressing:

• PCI , PCIexpress for the configuration address space
• USB , FireWire

The existence of point-to-point connections does not necessarily imply geographical addressability. Modern Ethernet emerged from coaxial predecessors and cannot be geographically addressed (without a special router). Plug-and-play capability is implemented here with the globally unique MAC addresses .