Rack Unit - What is in the U

What's in the U?

Have you ever bought rack mounting equipment and wondered what the U stands for (2U, 4U, etc.)? The U stands for rack unit and is a unit of measure to describe the height of equipment used in 19 and 23 inch racks. 1U is the equivalent of 1.75 inches. The 19 or 23 inch describes the width of the frame for the equipment.

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