Dimensions of the central rack in the computer room
The three primary dimensions to consider are rack height (measured in rack units or U), rack width (most commonly the industry-standard 19-inch format), and rack depth (typically ranging from 24 inches to 48 inches). The picture shows a lot of outboard gear built into the cabinets, which completely follows the 19-inch rack standard. A 19-inch rack is a standardized frame or enclosure for mounting multiple electronic equipment modules.
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