Measure Your Equipment Height (Rack Units – "U") Network cabinets are measured in rack units, abbreviated as "U". Cabinets typically range from 6U (for wall-mounted setups) to 48U (for large server rooms). In this guide, we'll walk you through everything you need to know about home networking cabinet sizes, from basic measurements to advanced selection strategies. four-post EIA cabinet or rack, with mounting posts that conform to English universal hole spacing per section 1 of ANSI/EIA-310-D-1992. A properly sized cabinet ensures that your equipment is well organized, cooled effectively, and easy to maintain — all of which contribute to. A network cabinet houses and organizes critical IT systems, which can configure to support a wide range of requirements.