The CRS Line card chassis comes in three different flavors : 4-slot, 8-slot and 16-slot.
3.
With TX Matrix Plus, operators can build systems containing up to 16 line card chassis for a total of up to 1024 10-Gigabit Ethernet ports or 256 40 Gbit / s ports.
4.
The second option allows for the most fault-tolerant system in a CRS system : although a single shelf switch-fabric allows for redundancy on most levels ( power . fans, management-cards, switch-cards etc . ), a multi-shelf system based on two switch-fabric cards and ( at least ) two line-card chassis will continue to run even when one of the switch-fabric shelfs is completely down.
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