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My biggest issue with elevators is that some places and hotels I‘ve been to use disconnected systems:

They have three elevators, but pressing one button only calls that specific elevator. So everyone presses all three buttons, meaning the three elevators basically turn into one.

I don‘t understand how this was ever signed off, but I‘ve seen it multiple times now...

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Someone cheapened out is my guess. Group dispatch. That is having multiple elevators communicating with each other is added feature or was added box. Don't want to pay the extra. Don't get that feature.

In general my understanding is that every single cab is unit that can operate alone separate from any others. Then these are grouped together to operate more efficiently. But this is feature you need to buy. Going too cheap someone might choose not to.

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