Qijian's competing star-IDC cabling selects appropriate cabling Products

Bkjia.com exclusive Article] for data center networking, we need to plan and design networks based on the actual requirements of enterprises and the amount of network resources required; after purchasing network equipment, servers, and other equipment, it is also important for designers to make a reasonable network layout and wiring for data centers and office locations.

As we talked about in qijian's competing star sword-Design and Management of IDC room cabling standardization, the IDC cabling system is mainly divided into two major parts during the construction process. One is the preliminary design, the other is product selection. An excellent IDC cabling system must be designed with both forward-looking and scalable features and adopt the most appropriate cabling products.

Select an appropriate cabling method for the IDC

In various data centers, the laying position of the Integrated Wiring System is divided into two categories: Online cabling and offline cabling, that is, ceiling cabling and floor cabling. Some users may ask, Which of the following is better? Which data center is applicable?

Strictly speaking, there are no advantages or disadvantages for online and offline cabling. There are usually three popular forms for users to choose from. The first is the form of a strong electrical weakness. The second is the form of a strong electrical weakness. The second is a strong electrical weakness, and the weak current is used as the lower line. The third is the weakness, and the strong electricity is used as the lower line.

When the data center is not large, the crosstalk between strong and weak cables is not obvious, and the problem of equipment cooling in the data center is relatively easy to solve, and there is no overly complicated problem during later maintenance. In this condition, all cables are laid under the Electrostatic Protection bottom plate, which ensures the overall performance of the data center without affecting the O & M difficulty, at the same time, it also saves the design and procurement costs of the overall construction investment cable tray and other online cabling equipment ).

When the data room size is large, the wiring method of strong and weak current cables is no longer applicable. On the one hand, the electrostatic interference problem is more prominent, and on the other hand, it is not conducive to maintenance by O & M personnel in the later stage.

In response to this problem, Tyco electronic amp wiring believes: "We generally recommend that you use strong electricity to go online and weak current to go offline. When strong power cables are laid online and weak current cables are laid offline, the security of strong power cables can be guaranteed, and the requirements for the height of the data center are not high, in addition, it can take into account the frequent adjustment of weak current cables, and ensure that the cold air transmitted by the dedicated air conditioner in the data room will not encounter great resistance during transmission under the floor. "

However, Wu Jian, Technical Director of The United States, believes: "Since the strong electrical cables are basically no longer adjusted after laying, they are more suitable to be laid under the room floor; weak cables are more or less increased or decreased due to equipment adjustment and internal expansion of the data center. Therefore, it is more suitable for cabling."

BKJIA reporter believes that there is no fixed standard for the specific method used for cabling, so the data center designers design the cabling system according to different data center requirements, more needs are based on different system requirements and comprehensive cost control to carry out rational design.

Cable selection for different data centers

According to the provisions of TIA 942-2005, integrated cabling products of the following transmission levels can be used in data centers:

Cat6 horizontal twisted pair; Cat 6A, Cat7 copper cabling system, OM1 Multimode Optical Fiber 62.5/125 micron) and OM2 Multimode Optical Fiber 50/125 micron), OM3 10-Gigabit Multimode Optical Fiber 50/125 micron ), OM4 10g Multimode Optical Fiber 50/125 micron), single-mode optical fiber. Therefore, Cat6A cables are recommended for cabling copper cables in general equipment rooms. OM3 10g multimode optical fiber is recommended.

As the basic platform for computer network systems, the Integrated Wiring System must balance the cost of the application system, that is, the transmission protocol of computer networks. According to the IEEE 802 standard, the following computer network protocols are currently in use:

Copper cable system: Mbps Ethernet, Mbps Ethernet, to be used 10 Gbps Ethernet;

Optical Cable System: 40 thousand Mbps Ethernet, 100,000 Mbps Ethernet, and 10 Gbps Ethernet, The Mbps Ethernet and Mbps Ethernet will be introduced soon.

It can be seen that the requirements of various network protocols for the Integrated Wiring transmission bandwidth are very different. If a single bandwidth product is used, the network product will be limited to a small range of options. To this end, we provide the following suggestions:

① Copper cable system:

Category 6 is the main type, and category 6A or Category 7 twisted pair wires can be shielded or unshielded in the had area.) To ensure Gigabit Ethernet transmission, leave room for 10-Gigabit Ethernet. In the EDA zone, as the twisted pair wires are nearby and can be changed at any time, the current category 6 can still be used as the primary category. If necessary, the type 6A or 7 can be used as the network device.

② Optical Cable System:

Because of the difficulty of construction, both the MDA, HDA, and EDA zones use OM3 10g multimode optical fiber cables) and OS1 single-mode optical fiber cables, this design will not affect the project because the optical cable products have different types of fiber cores in the same sheath. The advantage is that various optical fiber modules can be connected to the system. The purpose of this consideration is to install cheap network devices when the transmission traffic requirements are not high. In the future, when the transmission traffic in any region increases, high-end network devices can be installed at any time, while cheap network devices can still be moved to other areas for further use. Because network devices are quickly updated, you can add the most suitable network devices as needed without wasting existing devices.

In addition, in single-mode optical fiber cables, it is worth considering single-mode and zero-peak water cable. According to ITU-T G.652 Standard Single-Mode Optical Fiber standard), G.652A and G.652B are single-mode optical fiber, G.652C and G.652D are single-mode optical fiber, among them, G.652D can well support the future requirements of 40 thousand MB Ethernet and 100,000 MB Ethernet. With the development of optical fiber production technology, many foreign optical fiber production plants no longer produce low-end single-mode optical fiber, only single-mode and zero-water-peak Optical Fiber levels are G.652D ), china's optical fiber factory also has a single-mode zero-water-peak optical fiber product series. In order to ensure that the Integrated Wiring System can still meet the requirements of network equipment upgrade in the future, it is necessary to partially adopt single-mode and zero-peak water fiber in the MDA and HDA areas.