How many actually distinct impls of these things actually exist in the world?
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Well, some of these units use superconducting chips (cryogenically cooled), so make with that what you will
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God help me, but I can explain what every box on that diagram does, and what kind of information gets sent over every line. About 80% of the complexity comes from carriers wanting to maintain their overpriced roaming business model and not trusting each other.
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If email were designed the same way, you'd connect to the mail server of whatever network you attached to, which would have to check with some mail-server location server to find the firewall mail server provided by your mail provider, which would then proxy to the actual mail se
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