The node route processor (NRP) receives traffic from one or more NSP ATM switch ports, reassembles the ATM cells into packets, routes the packets, segments the routed packets, and sends them back to the ATM switch. The Cisco 6400 can contain multiple NRP modules, configured to operate independently or as redundant pairs (1+1). You can insert NRPs into slots 1 through 8 in the Cisco 6400 chassis.This model provides a Gigabit Ethernet interface and sufficient processing capability for handling OC-12 rate of user traffic.