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A switch fabric generally means an architecture that allows multiple concurrent point-to-point data transfers without the need to "share" bandwidth. For example ports 1 and 3 might be exchanging data while ports 2 and 4 are exchanging data too. What's important is ports' 1 and 3 data exchange doesn't "take" any of ports' 2 and 4 data exchange bandwidth, nor do ports' 2 and 4 data exchange "take" bandwidth from ports' 1 and 2 data exchange. NB: not all switches provide fabric to the edge ports, often multiple edge ports share a connection to the fabric.
Switch capacity is often a measure of the switch's fabric bandwidth and the switch's packets per second forwarding capacity. Sometimes a switch's capacity (fabric bandwidth and/or PPS) cannot support all its edge ports running at 100% with any frame size. (An example of this can be seen with the 3750G switches.)
BTW there are different architectures for switches, some of which might implement head-of-line blocking. I.e. there's more a switch than just its "capacity".
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