Cabinets distribution is one of the fundamental elements of the equipment almost every server. It is in rack cabinets are installed components forming the system of the telecommunications company - Network equipment and connecting cables. Wardrobes these are known as cabinet-type rack (often talk about them simply RACKI). Their task is not only to protect equipment from physical threats, but also provide for:

• agenda items servers,
• adequate ventilation,
• power.

Distribution cabinets are in two varieties, differing width mounted inside the frame. The most common are those with a width of 19 inches, although sometimes you can strike RACKI slightly wider, dwudziestotrzycalowe. In serwerowniach usually used are those first and it is their focus in this article.

Another important element that determines the size of the cabinet is its height, determining its capacity. This has already completely differently than the width: used for this purpose U (Eng unit - the unit), numbered 44.45 mm. In addition, it sets out not only the amount of cabinets, but the amount of equipment and active, so you can easily calculate what size wardrobe is something that we needed to accommodate all the components provided by us. The most popular size is 14U, 24u and 42U.

The equipment placed in the middle may have a height of one or more of Laws And so - a standard 1U switch deals, and the server - typically 1U or 2U and there are much higher, however, devices that measure 3 or more units U. As we know, in every rack, we will be able to mount so much equipment, how can its height. So if you have a wardrobe of the amount of 14U, we can put in it - theoretically - 14 devices with a height of 1U, or any combination of devices with different heights (eg 5 devices 2U and 1U and one 3U). Why theory? Since, in principle, does not fit the active network devices (such as servers, switches and routers) directly over each other - Always leave a space between them, to give them the best possible working conditions. Therefore, the number of devices placed in the cabinet will be lower - sometimes substantially - than its nominal capacity.

Devices are mounted on shelves przyczepianych to the vertical rails (see photo). Through the window inserted in the door, it is possible to monitor the activity placed inside the equipment without needing to open the entire cabinet. In addition, in some models, the front windshield is perforated in order to improve air circulation within the cabinet. This is not the only solution that has improved ventilation - for forcing air circulation is often used special fans placed in the floor and ceiling.