A complete set of new generation network cabinet system mainly includes cabinet main body, airflow management unit, cable management unit, power distribution unit, installation fixed accessories, KVM switch and rack LCD display, etc.
First, the cabinet system base wood requirements
In the late 1970s, businesses began installing computers in cabinets. However, installation is difficult due to incompatible equipment between multiple vendors. In 1984, the international electrotechnical commission ( iec ) adopted iec 297 - 3, which specifies a standard physical size of 482.6 nun ( lgin ) for cabinets. Other standards, such as EIA 310, further establish standards for rack-mounted telecommunications and it equipment. Despite the establishment of these standards, the continuous progress of the computer industry and its continuous integration with the telecommunications industry has created new problems, namely, the significant lag of these standards. This section systematically describes the identification and classification of user issues, and in-depth analysis of the nature and characteristics of the next generation of key business facilities cabinet system.
This section systematically analyzes the customer's problems with the cabinet system and points out the direction of the next generation of critical business facilities. The current design ideas and equipment are not solved, the most urgent problems have a common core problem, that is, the data center or network room to adapt to the poor cultural ability. Cabinet systems must be more adaptable to changing requirements in order to improve their availability and cost - effectiveness.
In many industries, with the progress in reliability, cycle, cost, standardization, pre-engineering and module requirements to further improve, the industry has reached a certain level of maturity. Designers and facility owners of critical business facilities and the cabinet systems they use should consider whether this requirement is met.
Ii. cabinet components
A complete set of next generation cabinet system mainly includes cabinet main body, airflow management unit, cable management unit, power distribution unit, installation fixed accessories, KVM switch and rack LCD display, etc. The cabinets referred to in this section generally refer to the cabinet body unless otherwise specified.
( a ) the cabinet body
Cabinet bodies that meet the design requirements of modern core machine rooms typically have the following characteristics.
( 1 ) the ventilation area of the front and rear doors shall not be less than 5355 cm2, meeting the ventilation requirements specified by the main server manufacturer.
Cabinet front door meeting ventilation area requirements
( 2 ) the vertical installation column can be adjusted conveniently to meet the requirements of equipment with different installation depths.
( 3 ) all EIA - 310 - d compliant equipment can be properly installed.
( 4 ) the integrated rear cable management dedicated channel allows users to easily lay, manage, and operate a large number of data cables, even if rack equipment is installed in the cabinet or if the cabinet is installed in parallel.
( 5 ) through the rear power distribution channel, users can easily install multiple models of vertically installed power distributor ( PDU ) without occupying valuable cabinet effective installation space. Special power distribution channel, convenient power distribution operation, at the same time
A greater number of power outlets are provided for cabinet mounting equipment, and no less than 21 iec power outlets can be provided in the power distribution channel on one side of the cabinet.
( 6 ) the power and data lines can come from the cabinet at the top of the cable tray, also can come from the lower space of overhead floor, so the cabinet top and bottom of the cabinet need to provide sufficient cable into the channel. In some use environments, power or data lines may need to be routed from one cabinet installed side-by-side to an adjacent cabinet, and side cable access ports may need to be provided on the routing channels at the rear of the cabinet to accommodate such use.
( 7 ) the cabinet on the vertical installation column marked the accurate position of each " u", eliminate the trouble of the user repeatedly find installation position, greatly facilitate the user's installation work.
( 8 ) the front door, rear door and side plate can be locked, and can only be opened with the key provided.
( 9 ) proven frame design, robust standard mounting rods, and heavy duty wheel feet provide static and dynamic load levels of not less than 900 kg.
( 10 ) set up multiple grounding bolts, for the equipment installed in the cabinet and all independent metal parts to provide sufficient ground.
( 11 ) front, rear and side panel design for quick removal. Removal of cabinet doors or side panels can bring unexpected convenience during equipment installation and routine maintenance.
( 2 ), airflow management unit
The air flow management unit is mainly use for preventing air from circulate repeatedly in that cabinet and improving the refrigeration efficiency of the machine room. Usually divided into passive and active mode.
1. passive airflow management unit
Passive airflow management units typically employ passive components to vary the distribution of airflow. For example, blind flanges can be quickly and easily installed in EIA - 31019 in. racks or cabinets with square mounting holes by occupying unused rack space to facilitate proper airflow within the cabinet and using a modular, tool-less design.
The metal bezel is used in the case of threaded rails, and the brush bar allows the cable to pass from the front of the rack to the back of the rack while blocking airflow.
Air recirculation is prevented by occupying unused rack space using an airflow steering baffle kit consisting of Lu, 2u, 4u, 8u baffles.
2. active airflow management unit
Active airflow management units typically employ active devices to vary the flow of airflow in the cabinet. Depending on the function, there are the following.
( 1 ) side-to-side airflow distribution. Rack equipment with lateral air flow presents a number of challenges to it facility managers, especially in refrigeration. Because most cabinets are designed in the form of air flow from front to back, it is difficult to maintain the desired operating temperature in laterally ventilated equipment. Cabinet - side air supply units allow for better safety and construction, allowing cabinets to be placed side-by-side one after another without preventing air flow.
Cabinet - side air supply units are typically 2u cabinet-mounted air supply products for lateral air flow between network equipment or servers. It draws the conditioned temperature and humidity air from the front of the cabinet and sends it to the airflow inlet on the side of the network equipment. In this way, the life of the apparatus is prolonged by supplying the appropriate inlet temperature.
A: yes, sir
The product is recommended for one or more network devices stacked continuously in a cabinet. The cabinet - side air supply unit may be placed above or below the network equipment, and the user may configure the air flow mode through interchangeable air flow guide vanes.
( 2 ) rear airflow management. In high-density device environments, conventional heat dissipation methods are generally inefficient. High - density installed cabinets can cause it equipment to overheat and cause downtime. Rack exhaust collects hot air from the exhaust and returns it to the ventilation duct, eliminating hot spots in the data center. Through the automatic fan speed adjustment mechanism based on temperature, the fan can automatically adjust the speed for optimal performance. The LCD display installed on the device allows the user to view rack temperature, monitor alarm conditions, and adjust device settings. The integrated network management card enables remote monitoring and control of rack exhaust equipment. This space-saving product is installed on the back of the cabinet that meets the requirements and does not occupy mesa space.
( 3 ) front airflow management. Rack front air distribution equipment is a unique rack mounted fan tray product that is used with existing precision air conditioning systems to deliver cold air to equipment within the enclosure. The air distribution equipment is connected with the movable floor, and the supplementary air is directly sent into the casing, so that the air distribution equipment can not be mixed with external hot air before reaching the equipment needing refrigeration.
The rack air distribution device eliminates temperature differences between the top and bottom of the enclosure and prevents high temperature exhaust gases from re-circulating from the inlet to the enclosure.
For rack enclosures, a rack air conditioning device with a rated load of more than 1.5 kw is appropriate and can provide airflow at a maximum of 3.0 kw. If the underground air conditioning equipment does not meet the requirements of the nearby telecommunication equipment, the above equipment shall be used additionally on the living floor.
Iii. cable management unit
Racks and cabinets can accommodate more equipment than ever before, and this increase in equipment density requires orderly cable management inside and outside the rack. Poor management of the cable may not only result in damage to the cable or increase the time required to replace the cable, but may also impede the passage or arrival of the main airflow, resulting in degraded equipment performance or even downtime. These accessories provide suitable cable management solutions for a variety of needs, from simple cable management rings, vertical or horizontal finishing panels to trunking and cable ladders.
According to the function can be divided into the following.
( 1 ) cable ladder. Usually used for overhead cable management between cabinets, commonly used size has width of l5cm and 30cm. In practical applications, the cable ladder is commonly referred to as a pair of use, one for data transmission and the other for power transmission, and the spacing distance is not less than l5cm.
( 2 ) cable channel. Cable channel is used for cable management outside the cabinet, usually installed at the top of the cabinet, generally installed at least 2 channels, respectively, for data cable and power cable management.
Cable channel assembly
( 3 ) horizontal cable management, that is, cable management inside the cabinet.
( 4 ) vertical cable management, that is, cable management inside the cabinet.
Iv. power distribution unit
The power distribution unit typically occupies an empty l room of the Lu or 0u cabinet
To provide not less than 21 power outlets for the entire cabinet. Power socket adopts the international general cl3, c19 standard, the maximum current value provided by a single power distribution unit is not less than 32a, and provide overload or short circuit protection.
Optional metering power distribution units provide advanced warnings to prevent accidental power overload. Once the user-defined alarm threshold is exceeded, local and remote real-time alarms can be issued for unexpected circuit overloads that may exist in mission-critical equipment, reducing risk. The metered rack PDU provides power utilization trends that allow data center managers to make informed decisions about the proper sizing of their it environments.
V. installation of fixed fittings
Mounting fixtures include stabilizing plates, keyboard drawers, light and heavy duty brackets, bolt lock brackets, ground straps, mounting rails, brackets, and associated hardware.