This will be interesting but I'll throw this out there. It seems on the ASA 5550, the module that ships with it is 8 physical ports yet 4 of them are used, no biggie here. The thing that is interesting is that this blade is the only blade that can be used in the chassis, not an AIP or CSC. My question to the group is why? I'm chewing on the thought that on my customers 5510s, 5520s and 5540s that when I configure the IPS blade on those firewalls, it indicates a backplane speed of a single GigabitEthernet0/1 connection. If cisco is using the same chassis for the 5550 then is it using the same single GigabitEthernet0/1 as the other models or is there a higher backplane speed to support the 5550 gbic module (4 gig ports) ? I'm wondering if that is why the non-interoperability between the blades and this chassis.