Each JAS node should contain a SpaceWire Router per the SMAC Profile which allows for extensive scaling of the network.
A network is made up of a number of links, nodes (endpoints) and routing switches. Links provide the means for passing packets from one node to another. Nodes can be either directly connected by links or connected via routing switches. Routing switches connect together many nodes and provide a means of routing packets from one node to one of many other possible nodes. The figure below shows an example of a SpaceWire network based on a typical JAS payload. It includes an arbitrary combination of nodes interconnected through multiple SpaceWire links. The arrangement is such that it provides multiple communication paths for redundancy.