What Is a 1U Horizontal Cable Manager? One rack unit (1U) equals 44. A 1U horizontal cable manager is a device that occupies exactly one rack unit and mounts between or near equipment to guide and protect. QSFPTEK launched a series of 0U and 1U cable management organizers for structured cabling solutions in a highly organized rack space. Servermall – trusted server hardware supplier with 10 years of experience. U (rack unit, RU) is a unit of equipment height in a 19" rack. Important: U describes height only, but a server's real "capabilities" are also determined by chassis depth. We explain what 1U, 2U, 18U, 42U, and other configurations mean, discussing precis Decoding Rack Units: Your Essential Guide to Understanding 1U, 2U, and Beyond 1U, 2U,. 18U, 42U: What Do They Mean? This comprehensive blog post demystifies the "U" unit in network server accessories—the standard. Practical, engineer-first guide to keeping patch cords under control around patch panels and switches—without killing airflow or turning every MAC into a mess. If you've ever opened a rack that “worked fine at handover” and found a dense, tangled front-of-rack a few months later, you already know. The cable management arm is compatible with most types of equipment. It is a fully adjustable, ruggedized solution. Some OEM cable management arms take up too much space in the rack.