As with the 4500 question you are doubling up the bandwidth figures which is not what you do.
To work out whether a module is oversubscribed or not you -
1) assume all ports are in are use and are simultaneously transmitting the full bandwidth of the link.
This is unlikely to happen but you cannot guarantee it won't.
2) take the switch fabric slot capacity and compare it with the above.
So in this case the module is 2:1 oversubscribed.
It's important to note that doesn't mean you will get oversubscription because that depends on how many ports you are using and how much bandwidth each port is sending to the switch fabric.
However if you want to guarantee that your ports are never oversubscribed it would mean you could not use all ports.
This module runs in either oversubscribed mode where you could get oversubscription or performance mode where you can guarantee your ports run at line rate.
When you enable performance mode the switch simply shuts down ports to guarantee the ones you can use will never be oversubscribed.
It also reallocates some of the port buffers from unused ports to the ports in use.
Which ones it shuts down depends on the port groups on the module.
Jon
