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AT-8400/12 Switch Chassis have Twelve payload slots for a variety of Ethernet line cards. Each line card can be viewed as an independent Ethernet switch; therefore, wire speed local switching is supported at all times with all packet sizes. Each of the 12 slots connect to the backplane via a 1.25Gbps serial bus for each transmit and receive (2.5Gbps full duplex). The center slot is reserved for a management/switch fabric card.