Machine Room Cabling Select the right wiring products

For the computer Room group network, we need to start from the actual needs of the enterprise, according to the number of network funds to plan and design a pragmatic network, in the procurement of network equipment and servers and other equipment, how the computer room, office location for the reasonable network layout and wiring, for designers, is also important.





room Wiring System in the construction process is divided into two major parts, one is the prophase design, the other is product selection. A good computer room wiring system, both designed to be very forward-looking and scalable, but also to use the most appropriate wiring products.





Choose the right way to lay the wiring of the room





in all kinds of computer rooms, integrated wiring system laying position divided into the line and down the line two categories, namely, ceiling wiring and floor wiring. Some users will ask, on the line and the next line which kind of better? What kind of room is it?





strictly speaking, up and down the line and there is no absolute advantages and disadvantages, there are usually three popular forms for users to choose. First, strong electrical weaknesses are all made under the form of the line, the second is strong electricity to do on the line, weak to do the next line, the third is to do on the line of weakness, strong electricity to do the next line.





when the size of the computer room is not large, the crosstalk between the strong and weak cable is not obvious, the computer room equipment cooling problem is relatively easy to resolve, and the maintenance of the latter does not exist too complex problems. Under this condition, all cables will be laid under the static protection floor, not only can guarantee the overall performance of the engine room, but also does not affect the operation dimension difficulty, at the same time saves the overall construction investment (bridge frame and so on line equipment design and the purchase cost).





when the computer room scale is large, the strong and weak electrical wiring way is no longer applicable, on the one hand, electrostatic interference problem will be more prominent, on the other hand, in the latter is also not conducive to the maintenance of transport personnel.





for this problem, Tyco electronic amp wiring think: "Generally we recommend strong electricity use on the line, weak use down line." When strong electricity is used to go up the line, weak use of the next line, because it can make strong wire and cable security is guaranteed, at the same time the height of the computer room is not high, but also able to take into account the current situation of weak cable often need to adjust, but also to ensure that the room in the special air conditioning transmission of cold air under the floor ”





Wu Jian, the technical director of the United States, said: "Strong wire cable due to the basic no longer adjusted after laying, so more suitable for laying in the room under the floor; and the weakness of cable due to equipment adjustment, room internal expansion and other reasons will be relatively more to increase or decrease, it is more suitable for the use of the way up the line set up. ”





51CTO Reporter that, for the specific use of which way to cabling, and there is no fixed standard to constrain, different room requirements so the designer of the computer room in the wiring system design, more need is based on different system requirements and integrated cost control to rationalize the design.





selection of cable in different computer room





according to Tia 942-2005, the following transmission level of integrated wiring products can be used in the computer room:





CAT6 type horizontal twisted pair; Cat 6A, CAT7 copper cabling System, OM1 multimode fiber (62.5/125 micron) and OM2 multimode fiber (50/125 microns), OM3 million multimode fiber (50/125 microns), OM4 million multimode fiber (50/125 microns) , single mode fiber. So the general room wiring copper cable recommended to use 6 categories above the cable, the conditions of the proposal to consider the use of CAT6A-type cable. Fiber optic cable recommends the use of OM3 million-mode fiber.




As the basic platform of computer network system,
integrated wiring system needs to balance the cost of application system, that is, the transmission protocol of computer network needs to be considered. Looking at the IEEE 802 series of standards, the computer network protocols currently in use include:





Copper System: Hundred Gigabit Ethernet, Gigabit Ethernet, will be used in Gigabit Ethernet;





Optical Cable system: Hundred Gigabit Ethernet, Gigabit Ethernet, Gigabit Ethernet, the upcoming 40,000 gigabit Ethernet and 100,000 Gigabit Ethernet.





This shows that a variety of network protocols for the transmission bandwidth requirements of the integrated wiring is very different, if the use of a single bandwidth products, the network products will be limited to a very small selection range. To this end, the following recommendations are made:





① Copper Cable System:





To six categories, in the had area can be appropriate to consider 6 A or 7 pairs of twisted-pair (shielding or not shielding), in order to ensure the transmission of Gigabit Ethernet under the premise of the million Gigabit Ethernet leave room. For the EDA area, because twisted pair is nearby, can be replaced at any time, so currently can still be 6 classes, if necessary, with network equipment replacement for 6 a class or 7 classes.





② Cable System:





due to the difficulty of construction, whether the MDA area, HDA area or EDA area, are used OM3 optical cable (Wanchaodo mode cable) and OS1 optical cable (Single-mode optical cable) at the same time laying the way, because the optical cable products with the same sheath containing different types of fiber core products series, Therefore, this design will not have an impact on the project. The advantage is that all kinds of optical fiber modules can be allowed to access the system. The purpose of this consideration is to install inexpensive network equipment when the transmission requirements are not high, and to install high-end network equipment at any time in the future, regardless of the region's higher transmission flow, while inexpensive network equipment can still be moved to other areas to continue to use. Due to the rapid upgrading of network equipment, this consideration can be without wasting existing equipment at the same time, according to the need to add the most suitable network equipment.





in addition, in Single-mode optical cable, it is worth considering the single mode 0 water peak cable. According to the ITU-T g.652 standard (single mode optical fiber standard), g.652a and g.652b are single-mode optical fibers, g.652c and g.652d are single mode 0 water peak fiber, in which g.652d can well support future 40,000 Gigabit Ethernet and 100,000 Gigabit Ethernet requirements. With the development of optical fiber production technology, many foreign fiber production plants have now no longer produce low-end single-mode fiber, only produce single mode 0 water peak fiber (grade g.652d), domestic fiber factory also has a single mode 0 water peak fiber product line. In order to ensure that the integrated cabling system can still meet the upgrading of network equipment, it is necessary to adopt the single mode 0 water peak fiber in the MDA region and HDA region.