I worked for company and we built a public data center. One of our 'products' was rack space. We had a few rows of shared racks where customers could rent 'quarter racks'. At that level there were bolted in separators. Power and network were available to each section of the rack separately. Network was available but not required per each customers needs.
I wish I could remember who made the racks. They had separate lockable doors on each section. We had full, half, and quarter rack segments available. Each with separate power and network connections. There were separate power strips in each cabinet section that were wired individually into the building common UPS. We did have two separate networks running over physically separate networks. One was for the outside and for public networks, the other went to our backup network that was also used for monitoring by data center personnel (not gatewayed to the 'outside'). Keeping 'baddies' from the internet away from customers was one goal. A second goal was keeping customers away from each other. (the rest of the story: The data center went online just as the 'bubble' burst back around 2001 and failed almost immediately. It was small, about 20,000 sq feet. 3 1MW generators, 2 1MW APC UPSes, two separate power feeds, and multiple network providers from different physical directions coming into the building. Redundant air chillers. Pretty much fully redundant all around. A pretty sweet setup. Last I heard it was being used as a 'backup center' by a consortium of hospitals in Houston to backup hepa data. It was a major POP for Phonoscope who provide fiber connections in the area, for a price.)
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