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  • It's worth pointing out that those parts are very end of life. But...

    The real world useful information is that it is very rare for all devices to transmit for a sustained period at once - i.e. there is averaging which means you do not need 1 to 1 capacity - if you do you need non-blocking.

    It's complex - 2 different things - the switching capacity of the card - this applies to traffic within the card, and then the fabric connection capacity. Key facts:
    fabric connection is actually 40Gbps per direction = 80Gbps duplex (marketing figure) which means you are only gong to send 40-Gbps from the card to fabric (other cards) - now this is actually non-blocking see next
    The card itself is actually 4 groups of 4 ports. each group of 4 has actually only 10Gbps duplex throughput - so you can either use 1 port only and get all 10Gbps constant, or you oversubscribe. How over subscription works is real complex but basically there is buffering and Queuing.

    Remember when this card and chassis were introduced 10Gbps was a rare thing. Later models had higher capacity.

    Summary is you can only connect 4 things to this and do continual 10Gbps throughput to either itself of the backplane fabric.

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