The 19 "boxes and subracks are used to protect and structure the hardware assembly to save storage space and protect the equipment from the action of external agents.
These boxes or subracks, the latter are not closed , mounts inside 19 "cabinets, racks and / or enclosures. This measurement is a standard in which the width is always 19 ". Although in reality there are other standardized widths, but they are used to a lesser extent and consequently we are not going to deal with them in this section. The specifications of a standard rack are under the equivalent standards DIN 41494 part 1 and 7, UNE-20539 part 1 and part 2 and IEC 297 part 1 and 2, EIA 310-D. Both the containers are cabinets, racks or enclosures have also standardized holes where we can fasten these boxes. The height of boxes and / or subracks is also standardized in units or U. A rack unit or simply U is a unit of measure used to describe the height of the equipment ready to be mounted in a 19 or 23 inch wide (48.26 cm or 58.42 cm) rack. One rack unit equals 1.75 inches (4.445 cm) high.
One U rack unit is normally written as 1U, in the same way two units is written 2U and so on. The height of a pi The amount of equipment in a rack is often described as a U number
We also have related accessories published in this section.