A little knowledge about the cabinet

About the cabinet, different equipment on the cabinet specifications, standards, power supply capacity and electrical compatibility have very strict requirements, this seemingly insignificant cabinet, in the data center power supply, ventilation and layout design, we need to go through strict design to complete the data center construction and business planning. Industry cabinet width * depth * high size standards are not uniform, the width may not meet the equipment installed into the depth may not meet the end of the equipment protruding outside the cabinet, the height may not be enough to cause the equipment installation space is not enough. Each device has strict requirements for the cabinet, for example, we often see such physical parameters described: width not less than 600mm, depth not less than 1100mm, height not less than 2000mm, available height space not less than 42U cabinet power input power can not be less than the total power consumption of the equipment in the cabinet, otherwise the customer's power supply system will have risks such as trip, so it is necessary to evaluate whether the power consumption is satisfied. In the specific implementation, but also to consider the cabinet load-bearing capacity, especially the machine room floor load-bearing capacity, because the cabinet is relatively heavy, to avoid bringing security risks to the client room, to assess the cabinet and floor load-bearing capacity. In the cabinet after the addition of new equipment, the room ventilation and heat dissipation changes, to assess the heat dissipation capacity of this, to avoid high ambient temperature caused by device failure. At present, the most popular cabinet specifications are IEC (International Electrotechnical Commission)60297-1,60297-1, EIA-310-D (19-inch cabinet standard) , etc. , appearance Specification GB T4054-1983, and CISPR 22(2003) , CISPR 24(1998-09 + a 1:2001a 2:2003) , IEC 61000-4-2-x series of Electromagnetic compatibility standards, etc. . Among them, IEC 60297-1 cabinet standard is the most extensive industry standard, EIA-310-D standard is the United States standard. The most commonly used cabinets in data centers are those with 19-inch mechanical construction (IEC 60297-2 specification) and are Modular rocket for easy expansion and maintenance; The outer surface of the cabinet and the frame parts are mostly gray. The unit of height defined in IEC 60297 is U (1 u = 1.75 inch, about 44.45 mm) , and the weight of empty cabinet is the weight of cabinet with front and back doors. Cabinet structure and components

Attention to the working environment inside the cabinet: the working environment temperature and relative humidity of the cabinet should be concerned. In order to ensure that the equipment always has a good working state, in the room need to maintain a certain temperature, humidity.

Temperature and humidity in the machine room are measured at 1.5 m above the ground and 0.4 m in front of the equipment; short-term working conditions are defined as not exceeding 48 hours continuously and not exceeding 15 days cumulatively each year. The structure features of the cabinet mainly include cabinet material, wiring, ESD jack, cabinet heat dissipation, cabinet protection, installation scene and cabinet together. The cabinet is made of high-strength grade a carbon cold-rolled steel and galvanized steel. The internal material has certain standards and specifications to be followed, such as UL (Underwriter Laboratories) standard for fire resistance, restriction of the use of certain Hazardous Substances (RoHS) and fire resistance of internal materials to UL (Underwriter Laboratories) standards. Different standard cabinet in the structure and components of a slight difference, but in general, the common cabinet including the front door, frame and back door. Some special cabinets will also include PDU, power, cooling system, management system. The top and the bottom of the cabinet are left with wire holes to support the top and bottom out of the line two ways of wiring. When the cabinet is installed, the anti-static wrist should be worn. One end of the interface of the anti-static wrist should be inserted in the ESD jack in the middle of the cabinet.

In the installation, maintenance operation, need to wear anti-static wrist, anti-static wrist interface end to be inserted in the cabinet of the ESD jack. There are high-density ventilation holes on the front, back door and bottom plate of the cabinet, which can support the forward air, the back air, the floor air in and out, and make the cabinet have good heat dissipation performance. In the protection of the cabinet, the Electromagnetic compatibility problem has been fully considered in the design, so that the cabinet has a good electromagnetic shielding performance. The ventilation holes on the bottom board of the cabinet are lined with dustproof net, so that the cabinet has good dustproof performance.

Cabinet support side by side cabinet, the top of the use of parallel cabinet connecting plate connection, can achieve safe cabinet fixation, but also can effectively use the cabinet room space, which rented the room for customers, you can also effectively save on space rental costs. In some custom or high-end cabinets, there is also a Rack Management Controller (RMC) , which directly manages modules and small systems such as power modules and fans.

Power module is generally divided into AC/DC (compatible DC/DC) , DC equipment for the cabinet to provide power, power module to support hot swapping and redundant backup. RMC management module to achieve the management of power supply, including power status monitoring and power capping. PDU (Power Distribution Unit) is divided into DC PDU, three-phase AC PDU and single-phase AC PDU, for the cabinet of Power modules, switches and other equipment to provide Power Distribution; the following is one-way PDU schematic diagram. PDU is one of the necessary parts of the cabinet. It also needs to meet the requirements of CE, ROHS, and IEC 309, IEC 320C13, IEC 320C19.

The network cabinet is used for assembling installation panels, electronic component, plug-ins, plug-ins, devices and mechanical parts and components to form an integral installation box.