For example, Two RoX switch chips have a 4.8 Gbps bandwidth while four RoX switch chips have a 9.6 Gbps bandwidth. Each of the devices on the ring has its own switch engine. A separate control bus handles status, routing, and flow control information, freeing up the data bus for data transmission. One major advantage in ring architecture is the economic advantage. A bus architecture is much less expensive than separate cross bar elements.
Buses are easy to implement and inexpensive to expand.
Bandwidth Aggregates Resulting in Higher Performance Just as important is the advantage gained in performance due to aggregating bandwidth through the ring. As a system is expanded, the ring bandwidth actually aggregates. The overall ring aggregated bandwidth is 9.6 Gbps. Note that not all traffic goes to the ring. Most traffic will only use or two nodes of the ring bandwidth with gives the ring higher effective traffic bandwidth.