It seems like in many organizations, the industrial/plant/SCADA networks aren't managed by the IT department, they are managed by the "operations" group.
How common is that? Being a networking guy it drives me nuts. It seems like they try to put serial stuff everywhere and giant L2 domains anywhere that serial won't work.
In my organization we've had pretty good luck having the IT department manage most of that, and so it's smaller L2 domains and Ethernet over serial wherever possible, but it was a big battle
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