Geographic addressing
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 .