The Cisco 7200 Series Routers
The 7200 router was the first Cisco router designed to use the now common, industry-standard PCI bus. The 7200 series has a modular architecture that uses replaceable media interfaces called port adapters and an interchangeable main processor called the Network Processing Engine(NPE).
The 7200 is available in several configurations based upon combinations of chassis models and available NPEs. The number of slots and the type of midplane installed distinguish the chassis models. At the time of this writing, two midplane designs are available for the 7200 series chassis:
Original midplane— Contains two PCI buses running at 25 MHz. Each bus connects to half the slots in a chassis. This midplane supports all NPEs except ...