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This page is discussing a historical feature, although it can still be effectively true of concentrators. I think some of this information is valuable. However, it needs to be rewritten "so your grandma could understand it" (assuming that she's not a teleco engineer). As it stands it is not going
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A more clear diagram treating it all as a subscriber switch with a concentrator followed by two layers of switching matrix and showing the calls connected all the way through the matrix would help. You could then show a call being blocked even though capacity exists elsewhere in the exchange.
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The present article is presented from a crosspoint switch point of view, which is appropriate to the late 20th century especially in North
America. The term "grading" was more used in selector switch bank working, as briefly alluded to in
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Alas, I haven't the patience to work up an introductory description of a theory that I, as a crossbar mechanic, studied a little but didn't actually use.
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I agree, I am, in addition to being somebody's grandad, educated to degree level and this was completely over my head.
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Knowledge. If you would like to participate, please visit the project page, where you can join
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This article references Figure 1, but no figure is present. -KI4IHC - too lazy to login
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to be very usable, please consider rewriting it a bit.
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