Method for operating a packet based data network

A method for operating package-based data network (21); 31) Method, the data network (21); 31) Comprises multiple nodes (A, B, C and D) and a shared data bus (22); 32), At least part (nodes A, B, C and D) is data bus (22); 32) For increasing business quantity, and upstream node (A, B, C and D) is fair mechanism for downstream node (A, B, C and D) content data bus (22); 32) And the data transmission capacitor, wherein realizing at least part (nodes A, B, C and D) of the data bus (22); 32) In the business quantity, and fair mechanism is consider (A, B, C and D) is branched of the business quantity in downstream node. Method for the invention realizes better bandwidth is; and by the available resource effectively.