In a representation by means of hubs, each connected subgraph induced by hubs establishes a bus. All regular nodes (non-hubs) which are connected to hubs of the same component are end-nodes of the same bus. In other words, nodes which are reachable on paths consisting of only hubs belong to the same bus. Of course, a node can be an end-node of more than one bus.

Since a bus models a group of nodes in which every node is connected to every other node, it can be represented as a complete subgraph of these nodes. To distinguish buses in this representation, each edge must be associated with a unique ID which identifies the bus it is associated to. This is the representation expected by BusRouter .