Vendors can exaggerate the capacity of their products in many ways.
It can easily be over-stated by summing various inputs and outputs. Some vendors, especially those selling routers, double the stated throughput of their switches by counting packets once on the way in and once on the way out. For example, this makes a 40 Gbps router look like an 80 Gbps router. If Marconi used the ingress and egress capacity of the switch to calculate total capacity, the 480 Gbps version of the BXR-48000 would actually be a 960 Gbps switch router. Gbps switch router.