I am unfamillar with the 19″ network Cabinet when the customers have quotations for it, especially for the meaning of 1U/2U. To avoid to be speechless when I am talking with foreign customers, I did some research about it, Here I want to share with you.
U(The acronyms of Unit) is the unit of the external dimensions of the racks. The specified size is defined by the EIA(Electronics Industry Association) which is the industrial association in America. 1U=44.45mm, the width is 48.26cm(19inches) and the height is the multiple of 4.445cm. The standard network cabinet is 19 inches, and the height is the multiples of 4.445cm, therefore, 1U is 4.445 cm in height, 2U is 2 times of 1U, 8.89 cm.
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