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+18 votes

I don't really understand what is going on in this diagram with the black dots and crossing lines. If someone could explain it in some different language than the book I would appreciate it.

asked in CSC335_Spring2019 by (1 point)

1 Answer

+10 votes
Best answer

The illustration is explaining switch paths based on inputs/outputs in parallel. The graph is organized into a matrix that could have anywhere from M inputs and N outputs based on the use case of it. Each of the 'dots' is a switch where an input m and output n are matched and closes this relation by noting a dot at the cross point of it.

I think that the crossbar illustration is trying to show us a lower level interpretation of how a switch handles incoming transmission and how they are sent out to their end destinations (if known). Then this idea is followed up by a 'better' way to do it used more efficient switches that can handle high memory load and more parallel connections to occur without bottle-necking.

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