Reasonable and effective cable layout plays an important role in saving electric energy, saving energy and reducing consumption. At present, there are two main construction situations in the computer room, one is centralized wiring, and the other is two-level cable management, mainly referring to network switches.
The switch in this way of central wiring uses the IDG computer room standard. The first-level switch directly points to the server, and can directly reach the user server through the cable. The use of two-stage switches is mainly to save the pressure of cable layout. From the main switch to the head cabinet of each column of cabinets, a layer 2 switch is placed in the head cabinet, and the main switch and the layer 2 switch are connected by optical cables.
The selection of the wiring form of the computer room is not independent, and needs to be coordinated with other systems, such as power supply system, air conditioning system, fire protection system, integrated wiring system, etc., especially the coordination with the air conditioning system is one of the important factors in determining the wiring form. The ideal design effect can only be achieved after overcoming the constraints between the systems.
Room wiring
The computer room air conditioning system is generally divided into two types: side air supply and downward air supply. Most computer rooms with raised floors adopt the downward air supply method, because the downward air supply method has the best cooling effect and efficiency. The space (headroom) under the floor forms an air-conditioning air supply channel (also known as a static pressure box). Reasonable arrangement of air outlets on the floor can balance the temperature and humidity of each location in the computer room.
When using the bottom wiring method, if the wiring is randomly placed under the floor, it will form wind resistance, which will increase the resistance of the air supply. Minimize resistance to supply air. Since the power cable is relatively close to the ground, it is necessary to prevent the possible impact of water leakage from the air conditioner and human-caused damage to the power cable.
When using the upper wiring method, if the upper space is insufficient and the wiring layout is a multi-layer bridge, the return air path of the air conditioning system will be affected, resulting in a decrease in the return air speed and an increase in temperature (that is, an increase in the enthalpy difference), which will lead to the failure of the air conditioning system. load increases. This requires that the upper wiring should use a single-layer bridge layout as much as possible, and adjust the layout of the equipment. Otherwise, a building with a higher floor height must be selected as the computer room to leave enough return air passages for the air conditioning system. In some computer rooms, the upper and lower wiring is combined to simplify the number of layers in the bridge layout to meet the air supply and return air requirements of the air conditioner.
This type of coordination problem is more common in Class B computer rooms. Most of its air-conditioning systems use downward air supply, and the wiring form adopts upper wiring or a combination of upper and lower wiring according to conditions; Class A computer rooms basically eliminate the constraints, and the air-conditioning system adopts down For air supply, the wiring is in the form of upper wiring; Class C equipment rooms generally use lower wiring, and use multiple cabinet air conditioners for cooling by side air supply, avoiding the restriction of lower wiring.
Once the wiring form of the equipment room is determined, it needs to be constructed in strict accordance with the specifications and standards of the integrated wiring, especially the quality control of the optical fiber fusion link. At present, a large number of multimode optical fibers are used in the equipment room, and their tensile strength is limited. Its material and precision determine that the optical fibers cannot be moved around frequently. Therefore, in addition to laying out the optical cables according to the specifications, the fusion quality of the optical fiber ends affects the optical fiber. The key factor of communication quality, the smaller the loss of the welding point, the better. In practice, it can be 0 or 0.01db, and the general requirement is not more than 0.05db. Through reasonable wiring planning and high-standard construction, a solid and stable foundation can be laid for the safety of the equipment room.
