The cabinet industry jargon

Cabinet in the industry, there are some professional terms, but, as a buyer, these terms are really understand? Beijing today by better industry electronic technology co. , LTD. , to introduce some cabinet of some commonly used terms!
'U' in the cabinet is what mean?
'U' is a highly units, 1 U material 1. 75 'material 4. 445 cm. 42 u mean, actually inside the cabinet can use height is 42 u, about 1870 mm, other and so on. The 'U' in the server at the same, is refers to the height. '1 u server' refers to the height of 1 u, about 4. 445 cm server products.
'19-inch standard rack structure' what meaning be?
19 inches width is a unit, is approximately equal to 483 mm, is refers to the cabinet for installation of equipment in the distance between the pillars. Standard frame structure, namely the width, is the European standard, is the world's most recognized by IT vendors, belong to the common standards. Most of the network products ( Such as racks of switches, routers, distribution frame, KVM switches, firewall, etc. ) And the server ( Such as: rack-mountable server) Have marked in the product specification is in line with the frame structure, if meet, is installed inside a standard rack can be portable, if do not conform to the standard, the frame structure of the solely through machine cabinets tray retainer, and put in the cabinet, Such as: tower server, horizontal server, ordinary CRT or LCD monitors, desktop switcher, etc. ) 。
'rack column' what meaning be?
columns, usually refers to the equipment installed in the cabinet with metal square hole, the main supporting role within the cabinet, the plate thickness determines what the maximum weight can be installed equipment. High-end or well-made cabinet pillar are clearly marked with 'U' scale, convenient installation of equipment. The thickness of the pillar generally USES 1 in the industry. 8mm— 2. 0 mm plate processing production, can satisfy the bearing requirements of most products. 'Support the anchor' is what?
support anchor 'refers to a supporting rack used for supporting feet. Can also be known as the 'anchor' installation, 'tilt the anchor', 'seed', etc. , the main purpose is: retainer rack and internal equipment weight, thus reduce the load cabinet castor, also by adjusting the height of the support foot, make cabinet level in slope & lt; 5 ° of the ground.
'PDU' what meaning be?
'PDU is referred to as', 'called the English power distribution unit, power distribution equipment, can also be translated into Protocol Data unit, namely the computer Protocol Data unit. With family power lug plate functionally similar, but, PDU in appearance, performance, stability, material quality,
teaching the common plug wire, security unit has substantially increased, the latter is a professional product, for more room for current, voltage, lightning protection, prevent the occasions with higher requirements, such as overload can effectively protect the safe operation of equipment. Low 'M5' what meaning be?
'M5' is inside the cabinet configuration of screw standard. The M5 screw the screw tooth outside diameter is 5. 0, tooth pitch is 0. 8.
'tray' is what?
the tray can be divided into: adjustable tray fixed and adjustable keyboard tray. Purpose are the most equipment, fixed tray bearing is higher, therefore, used as a server and other heavy equipment, and because the keyboard tray can be smoked pull type structure design, so it can only be placed the keyboard, mouse, and small equipment.