C-Bus is a product of the Clipsal brand made by the Australian company Clipsal Australia Pty Ltd, a division of Schneider Electric.
C-bus is a two-wire bus, that carries both power and data. It is primarily used as a Lighting control system, but can also be used to integrate many other functions.
A single bus segment can address 255 individual devices, and bus segments can be extended by the use of bridges.
C-Bus is very powerful, and highly scalable. The smallest installation can comprise only two nodes. But many large commercial installations comprise a number of interconnected networks, and can include tens of thousands of nodes.
Source:
http://en.wikipedia.org/wiki/Clipsal_C-Bus
